The provisions of this chapter shall govern the materials, systems and assemblies used for structural fire resistanceand fire-resistance-rated construction separation of adjacent spaces to safeguard against the spread of fire and smoke within a building and the spread of fire to or from buildings.
Fire assemblies that serve multiple purposes in a building shall comply with all of the requirements that are applicable for each of the individual fire assemblies.
Interior walls and partitions of nonsymmetrical construction shall be tested with both faces exposed to the furnace, and the assigned fire-resistance ratingshall be the shortest duration obtained from the two tests conducted in compliance with ASTM E119 or UL 263. Where evidence is furnished to show that the wall was tested with the least fire-resistant side exposed to the furnace, subject to acceptance of the building official, the wall need not be subjected to tests from the opposite side (see Section 705.5 for exterior walls).
Combustible aggregates are permitted in gypsum and Portland cement concrete mixtures for fire-resistance-rated construction. Any component material or admixture is permitted in assemblies if the resulting tested assembly meets the fire-resistance test requirements of this code.
Fire-resistance-rated assemblies tested under ASTM E119 or UL 263 shall not be considered to be restrained unless evidence satisfactory to the building officialis furnished by the registered design professionalshowing that the construction qualifies for a restrained classification in accordance with ASTM E119 or UL 263. Restrained construction shall be identified on theconstruction documents.
Where materials, systems or devices that have not been tested as part of a fire-resistance-rated assembly are incorporated into the building element, component or assembly, sufficient data shall be made available to thebuilding officialto show that the required fire-resistance ratingis not reduced.
In determining the fire-resistance ratingof exterior bearing walls, compliance with the ASTM E119 or UL 263 criteria for unexposed surface temperature rise and ignition of cotton waste due to passage of flame or gases is required only for a period of time corresponding to the requiredfire-resistance ratingof an exterior nonbearing wall with the same fire separation distance, and in a building of the same group. Where thefire-resistance ratingdetermined in accordance with this exception exceeds the fire-resistance ratingdetermined in accordance with ASTM E119 or UL 263, the fire exposure time period, water pressure and application duration criteria for the hose stream test of ASTM E119 or UL 263 shall be based on the fire-resistance ratingdetermined in accordance with this section.
The application of any of the methods listed in this section shall be based on the fire exposure and acceptance criteria specified in ASTM E119 or UL 263. The required fire resistanceof a building element, component or assembly shall be permitted to be established by any of the following methods or procedures:
Engineering analysis based on a comparison of building element, component or assemblies designs having fire-resistance ratingsas determined by the test procedures set forth in ASTM E119 or UL 263.
Alternative protection methods as allowed by Section 104.11.
Under the prescriptive fire-resistance requirements of this code, thefire-resistance ratingof a building element, component or assembly shall be established without the use of automatic sprinklers or any other fire suppression system being incorporated as part of the assembly tested in accordance with the fire exposure, procedures and acceptance criteria specified in ASTM E119 or UL 263. However, this section shall not prohibit or limit the duties and powers of the building officialallowed by Sections 104.10 and 104.11.
The tests indicated in Sections 703.5.1 and 703.5.2 shall serve as criteria for acceptance of building materials as set forth in Sections 602.2, 602.3 and 602.4 in Type I, II, III and IV construction. The term "noncombustible" does not apply to the flame spread characteristics of interior finishor trim materials. A material shall not be classified as a noncombustible building construction material if it is subject to an increase in combustibility or flame spread beyond the limitations herein established through the effects of age, moisture or other atmospheric conditions.
Materials having a structural base of noncombustible material as determined in accordance with Section 703.5.1 with a surfacing not more than 0.125 inch (3.18 mm) thick that has a flame spread indexnot greater than 50 when tested in accordance with ASTM E84 or UL 723 shall be acceptable as noncombustible materials.
Fire-resistance-rated glazing, when tested in accordance with ASTM E119 or UL 263 and complying with the requirements of Section 707, shall be permitted. Fire-resistance-rated glazing shall bear a labelmarked in accordance with Table 716.3 issued by an agency and shall be permanently identified on the glazing.
Where there is an accessible concealed floor, floor-ceiling or attic space, fire walls, fire barriers, fire partitions, smoke barriersand smoke partitions or any other wall required to have protected openings or penetrations shall be effectively and permanently identified with signs or stenciling in the concealed space. Such identification shall:
Be located within 15 feet (4572 mm) of the end of each wall and at intervals not exceeding 30 feet (9144 mm) measured horizontally along the wall or partition.
Include lettering not less than
2
inches
(50.8
mm) in height with a minimum
1/4-inch
(6.35 mm)
stroke in a contrasting color incorporating the suggested wording, "FIRE AND/OR SMOKE BARRIER—PROTECT ALL OPENINGS," or other wording.
The fire-resistance ratingsof structural members and assemblies shall comply with this section and the requirements for the type of construction as specified in Table 601. The fire-resistance ratingsshall be not less than the ratings required for the fire-resistance-rated assemblies supported by the structural members.
Where columns are required to have protection to achieve a fire-resistance rating, the entire column shall be provided individual encasement protection by protecting it on all sides for the full column height, including connections to other structural members, with materials having the requiredfire-resistance rating. Where the column extends through a ceiling, the encasement protection shall be continuous from the top of the foundation or floor/ceiling assembly below through the ceiling space to the top of the column.
Members of the primary structural frame other than columns that are required to have protection to achieve a fire-resistance ratingand support more than two floors or one floor and roof, or support a load-bearing wall or a nonload-bearing wall more than two stories high, shall be provided individual encasement protection by protecting them on all sides for the full length, including connections to other structural members, with materials having the required fire-resistance rating.
Exception:
Individual encasement protection on all sides shall be permitted on all exposed sides provided the extent of protection is in accordance with the required fire-resistance rating, as determined in Section 703.
The required thickness and construction of fire-resistance-rated assemblies enclosing trusses shall be based on the results of full-scale tests or combinations of tests on truss components or on approvedcalculations based on such tests that satisfactorily demonstrate that the assembly has the required fire resistance.
The edges of lugs, brackets, rivets and bolt heads attached to structural members shall be permitted to extend to within 1 inch (25 mm) of the surface of the fire protection.
Thickness of protection for concrete or masonry reinforcement shall be measured to the outside of the reinforcement except that stirrups and spiral reinforcement ties are permitted to project not more than 0.5-inch (12.7 mm) into the protection.
Pipes, wires, conduits, ducts or other service facilities shall not be embedded in the required fire protective covering of a structural member that is required to be individually encased.
Where the fire protective covering of a structural member is subject to impact damage from moving vehicles, the handling of merchandise or other activity, the fire protective covering shall be protected by corner guards or by a substantial jacket of metal or other noncombustible material to a height adequate to provide full protection, but not less than 5 feet (1524 mm) from the finished floor.
Exception:
Corner protection is not required on concrete columns in open or enclosed parking garages.
Load-bearing structural members located within the exterior wallsor on the outside of a building or structure shall be provided with the highestfire-resistance ratingas determined in accordance with the following:
As required by Table 601 for the type of building element based on the type of construction of the building;
As required by Table 601 for exterior bearing walls based on the type of construction; and
Fire protection is not required at the bottom flange of lintels, shelf angles and plates, spanning not more than 6 feet 4 inches (1931 mm) whether part of the primary structural frame or not, and from the bottom flange of lintels, shelf angles and plates not part of the structural frame, regardless of span.
Fire-resistance ratingsfor the isolation system shall meet thefire-resistance ratingrequired for the columns, walls or other structural elements in which the isolation system is installed in accordance with Table 601. Isolation systems required to have a fire-resistance ratingshall be protected with approvedmaterials or construction assemblies designed to provide the same degree of fire resistanceas the structural element in which the system is installed when tested in accordance with ASTM E119 or UL 263 (see Section 703.2).
Such isolation system protection applied to isolator units shall be capable of retarding the transfer of heat to the isolator unit in such a manner that the required gravity load-carrying capacity of the isolator unit will not be impaired after exposure to the standard time-temperature curve fire test prescribed in ASTM E119 or UL 263 for a duration not less than that required for the fire-resistance ratingof the structure element in which the system is installed.
Such isolation system protection applied to isolator units shall be suitably designed and securely installed so as not to dislodge, loosen, sustain damage or otherwise impair its ability to accommodate the seismic movements for which the isolator unit is designed and to maintain its integrity for the purpose of providing the required fire-resistance protection.
The application of SFRM shall be consistent with the fire-resistance ratingand the listing, including, but not limited to, minimum thickness and dry density of the applied SFRM, method of application, substrate surface conditions and the use of bonding adhesives, sealants, reinforcing or other materials.
The application of SFRM shall be in accordance with the manufacturer's installation instructions. The instructions shall include, but are not limited to, substrate temperatures and surface conditions and SFRM handling, storage, mixing, conveyance, method of application, curing and ventilation.
Substrates to receive SFRM shall be free of dirt, oil, grease, release agents, loose scale and any other condition that prevents adhesion. The substrates shall be free of primers, paints and encapsulants other than those fire tested and listed by a nationally recognized testing agency. Primed, painted or encapsulated steel shall be allowed, provided that testing has demonstrated that required adhesion is maintained.
Where the SFRM is to be applied over primers, paints or encapsulants other than those specified in the listing, the material shall be field tested in accordance with ASTM E736. Where testing of the SFRM with primers, paints or encapsulants demonstrates that required adhesion is maintained, SFRM shall be permitted to be applied to primed, painted or encapsulated wide flange steel shapes in accordance with the following conditions:
The beam flange width does not exceed 12 inches (305 mm); or
The column flange width does not exceed 16 inches (400 mm); or
The beam or column web depth does not exceed 16 inches (400 mm).
The average and minimum bond strength values shall be determined based on a minimum of five bond tests conducted in accordance with ASTM E736. Bond tests conducted in accordance with ASTM E736 shall indicate an average bond strength of not less than 80 percent and an individual bond strength of not less than 50 percent, when compared to the bond strength of the SFRM as applied to clean uncoated 1/8-inch-thick (3.2 mm) steel plate.
A minimum ambient and substrate temperature of 40°F (4.44°C) shall be maintained during and for not fewer than 24 hours after the application of the SFRM, unless the manufacturer's instructions allow otherwise.
The finished condition of SFRM applied to structural members or assemblies shall not, upon complete drying or curing, exhibit cracks, voids, spalls, delamination or any exposure of the substrate. Surface irregularities of SFRM shall be deemed acceptable.
Cornices, eave overhangs, exterior balconies and similar projections extending beyond the exterior wall shall conform to the requirements of this section and Section 1406. Exterior egress balconies and exterior exit stairways and ramps shall comply with Sections 1021 and 1027, respectively. Projections shall not extend any closer to the line used to determine the fire separation distance than shown in Table 705.2.
Exception:
Buildings on the same lot and considered as portions of one building in accordance with Section 705.3 are not required to comply with this section for projections between the buildings.
Projections from walls of Type I or II construction shall be of noncombustible materials or combustible materials as allowed by Sections 1406.3 and 1406.4.
Exception:
Type VB construction shall be allowed for combustible projections in Group R-3 and U occupancies with a fire separation distance greater than or equal to 5 feet (1524 mm).
For the purposes of determining the required wall and opening protection, projections and roof-covering requirements, buildings on the same lot shall be assumed to have an imaginary line between them.
Where a new building is to be erected on the same lot as an existing building, the location of the assumed imaginary line with relation to the existing building shall be such that the exterior walland opening protection of the existing building meet the criteria as set forth in Sections 705.5 and 705.8.
Exceptions:
Two or more buildings on the same lot shall be either regulated as separate buildings or shall be considered as portions of one building if the aggregate area of such buildings is within the limits specified in Chapter 5 for a single building. Where the buildings contain different occupancy groups or are of different types of construction, the area shall be that allowed for the most restrictive occupancy or construction.
Where an S-2 parking garage of Construction Type I or IIA is erected on the same lot as a Group R-2 building, and there is no fire separation distancebetween these buildings, then the adjoining exterior wallsbetween the buildings are permitted to have occupant use openings in accordance with Section 706.8. However, opening protectives in such openings shall only be required in the exterior wall of the S-2 parking garage, not in the exterior wall openings in the R-2 building, and these opening protectives in the exterior wall of the S-2 parking garage shall be not less than 11/2-hour fire protection rating.
Where protected openings are not limited by Section 705.8, the limitation on the rise of temperature on the unexposed surface of exterior wallsas required by ASTM E119 or UL 263 shall not apply. Where protected openings are limited by Section 705.8, the limitation on the rise of temperature on the unexposed surface of exterior wallsas required by ASTM E119 or UL 263 shall not apply provided that a correction is made for radiation from the unexposed exterior wall surface in accordance with the following formula:
Area of exterior wallsurface in the story under consideration exclusive of openings, on which the temperature limitations of ASTM E119 or UL 263 for walls are exceeded.
Feo
=
An "equivalent opening factor" derived from Figure 705.7 based on the average temperature of the unexposed wall surface and the fire-resistance rating of the wall.
For SI: °C = [(°F) - 32] / 1.8.
FIGURE 705.7 EQUIVALENT OPENING FACTOR
The maximum area of unprotected and protected openings permitted in an exterior wallin any storyof a building shall not exceed the percentages specified in Table 705.8.
Exceptions:
In other than Group H occupancies, unlimited unprotected openings are permitted in the first story above grade plane either:
Where the wall faces an unoccupied space. The unoccupied space shall be on the same lot or dedicated for public use, shall be not less than 30 feet (9144 mm) in width and shall have access from a street by a posted fire lane in accordance with the International Fire Code.
Buildings whose exterior bearing walls, exterior nonbearing walls and exterior primary structural frame are not required to be fire-resistance rated shall be permitted to have unlimited unprotected openings.
Exception:
Opening protectives are not required where the building is equipped throughout with an automatic sprinkler systemin accordance with Section 903.3.1.1 and the exterior openings are protected by a water curtain using automatic sprinklers approvedfor that use.
Where unprotected openings are permitted, windows and doors shall be constructed of any approvedmaterials. Glazing shall conform to the requirements of Chapters 24 and 26.
Where both unprotected and protected openings are located in the exterior wallin any storyof a building, the total area of openings shall be determined in accordance with the following:
(Equation 7-2)
where:
Ap
=
Actual area of protected openings, or the equivalent area of protected openings, Ae (see Section 705.7).
Openings in exterior wallsin adjacent storiesshall be separated vertically to protect against fire spread on the exterior of the buildings where the openings are within 5 feet (1524 mm) of each other horizontally and the opening in the lower storyis not a protected opening with a fire protection rating of not less than 3/4 hour. Such openings shall be separated vertically not less than 3 feet (914 mm) by spandrel girders, exterior wallsor other similar assemblies that have afire-resistance ratingof not less than 1 hour, rated for exposure to fire from both sides, or by flame barriers that extend horizontally not less than 30 inches (762 mm) beyond the exterior wall. Flame barriers shall have afire-resistance ratingof not less than 1 hour. The unexposed surface temperature limitations specified in ASTM E119 or UL 263 shall not apply to the flame barriers or vertical separation unless otherwise required by the provisions of this code.
Exceptions:
This section shall not apply to buildings that are three storiesor less above grade plane.
For buildings on the same lot, opening protectives having a fire protection ratingof not less than 3/4 hour shall be provided in every opening that is less than 15 feet (4572 mm) vertically above the roof of an adjacent building or structure based on assuming an imaginary line between them. The opening protectives are required where the fire separation distancebetween the imaginary line and the adjacent building or structure is less than 15 feet (4572 mm).
Exceptions:
Opening protectives are not required where the roof assembly of the adjacent building or structure has a fire-resistance rating of not less than 1 hour for a minimum distance of 10 feet (3048 mm) from the exterior wall facing the imaginary line and the entire length and span of the supporting elements for the fire-resistance-rated roof assembly has a fire-resistance ratingof not less than 1 hour.
Buildings on the same lot and considered as portions of one building in accordance with Section 705.3 are not required to comply with Section 705.8.6.
The void created at the intersection of a floor/ceiling assembly and an exterior curtain wall assembly shall be protected in accordance with Section 715.4.
The building has an area of not more than 1,000 square feet (93 m2) on any floor.
Walls that terminate at roofs of not less than 2-hour fire-resistance-rated construction or where the roof, including the deck or slab and supporting construction, is constructed entirely of noncombustible materials.
One-hour fire-resistance-rated exterior wallsthat terminate at the underside of the roof sheathing, deck or slab, provided:
Where the roof/ceiling framing elements are parallel to the walls, such framing and elements supporting such framing shall not be of less than 1-hour fire-resistance-rated construction for a width of 4 feet (1220 mm) for Groups R and U and 10 feet (3048 mm) for other occupancies, measured from the interior side of the wall.
Where roof/ceiling framing elements are not parallel to the wall, the entire span of such framing and elements supporting such framing shall not be of less than 1-hour fire-resistance-rated construction.
Openings in the roof shall not be located within 5 feet (1524 mm) of the 1-hour fire-resistance-rated exterior wallfor Groups R and U and 10 feet (3048 mm) for other occupancies, measured from the interior side of the wall.
The entire building shall be provided with not less than a Class B roof covering.
In Groups R-2 and R-3 where the entire building is provided with a Class C roof covering, the exterior wallshall be permitted to terminate at the underside of the roof sheathing or deck in Type III, IV and V construction, provided one or both of the following criteria is met:
The roof sheathing or deck is constructed of approvednoncombustible materials or of fire-retardant-treated woodfor a distance of 4 feet (1220 mm).
The roof is protected with 0.625-inch (16 mm) Type X gypsum board directly beneath the underside of the roof sheathing or deck, supported by not less than nominal 2-inch (51 mm) ledgers attached to the sides of the roof framing members for a minimum distance of 4 feet (1220 mm).
Parapets shall have the same fire-resistance ratingas that required for the supporting wall, and on any side adjacent to a roof surface, shall have noncombustible faces for the uppermost 18 inches (457 mm), including counterflashing and coping materials. The height of the parapet shall be not less than 30 inches (762 mm) above the point where the roof surface and the wall intersect. Where the roof slopes toward a parapet at a slope greater than two units vertical in 12 units horizontal (16.7-percent slope), the parapet shall extend to the same height as any portion of the roof within a fire separation distancewhere protection of wall openings is required, but in no case shall the height be less than 30 inches (762 mm).
In Group R buildings of combustible construction, the soffit material shall be securely attached to framing members and shall be constructed using one of the following methods:
Non-combustible soffit material;
Fire retardant treated soffit material;
Vinyl soffit installed over 3/4-inch wood sheathing;
Vinyl soffit installed over 5/8-inch gypsum board;
Aluminum soffit installed over 3/4-inch wood sheathing; or
Aluminum soffit installed over 5/8-inch gypsum board.
Vinyl and aluminum soffit material may be installed without wood sheathing or gypsum backing board if the exterior wall finish is noncombustible for a minimum distance of 10 feet above finished grade or the building is equipped throughout with an automatic sprinkler system in accordance with 903.3.1.1.
The delayed effective date of this Rule is January 1, 2021. The Statutory authority for Rule-making is G. S. 143-136; 143-138.
UpCodes note: Prior to January 1, 2021, this section was:
"In Group R buildings of combustible construction, the soffit material shall be securely attached to framing members and shall be constructed using one of the following methods:
Noncombustible soffit material;
Fire-retardant treated soffit material;
Vinyl soffit installed over 3/4-inch wood sheathing;
Vinyl soffit installed over 5/8-inch gypsum board;
Aluminum soffit installed over 3/4-inch wood sheathing; or
Aluminum soffit installed over 5/8-inch gypsum board.
Venting requirements shall apply to both soffit and underlayment and shall be in accordance with Section 1203.2. Vent openings shall not be located within 5 feet (1524 mm) horizontally of any unprotected wall opening located within 3 feet (914.4 mm) vertically below the soffit.
Exceptions:
Vinyl and aluminum soffit material may be installed without wood sheathing or gypsum backing board if the exterior wall finish is noncombustible for a minimum distance of 10 feet (3048 mm) above finished grade.
Each portion of a building separated by one or more fire wallsthat comply with the provisions of this section shall be considered a separate building. The extent and location of such fire wallsshall provide a complete separation. Where a fire wallseparates occupancies that are required to be separated by a fire barrierwall, the most restrictive requirements of each separation shall apply.
Any wall located on a lot linebetween adjacent buildings, which is used or adapted for joint service between the two buildings, shall be constructed as a fire wallin accordance with Section 706. Party walls shall be constructed without openings and shall create separate buildings.
Fire wallsshall be designed and constructed to allow collapse of the structure on either side without collapse of the wall under fire conditions.Fire wallsdesigned and constructed in accordance with NFPA 221 shall be deemed to comply with this section.
Exception: For fire walls separating Group R-2 from Group S-2 buildings of different construction types in accordance with notes c and d of Table 706.4, the structural wall of the S-2 building shall be permitted to serve as the fire wall between the Group R-2 and Group S-2 buildings and shall be permitted to be laterally supported by floor construction of the same rating as the wall.
c. Where fire walls are used to separate Group R-2 buildings of Type V construction from Group S-2 buildings of Type IB construction, a 2-hour exterior wall of the Type IB S-2 structure shall be permitted to satisfy the requirements of Section 706.2 and Table 706.4 without requiring a fire wall on the Group R-2 building. The floor construction of the Group S-2 structure shall have a fire-resistance rating equal to or greater than the exterior walls of the Group S-2 structure when the floor provides lateral stability to the vertical construction.
d. Where fire walls are used to separate Group R-2 buildings of Type III construction from Group S-2 buildings of Type IA construction, a 3-hour exterior wall of the Type IA S-2 structure shall be permitted to satisfy the requirements of Section 706.2 and Table 706.4 without requiring a fire wall on the Group R-2 building. The floor construction of the Group S-2 structure shall have a fire-resistance rating equal to or greater than the exterior walls of the Group S-2 structure when the floor provides lateral stability to the vertical construction.
Fire wallsshall be permitted to terminate at the interior surface of combustible exterior sheathing or siding provided the exterior wallhas a fire-resistance ratingof not less than 1 hour for a horizontal distance of not less than 4 feet (1220 mm) on both sides of the fire wall. Openings within such exterior wallsshall be protected by opening protectives having a fire protection rating of not less than 3/4 hour.
Fire wallsshall be permitted to terminate at the interior surface of noncombustible exterior sheathing, exterior siding or other noncombustible exterior finishes provided the sheathing, siding or other exterior noncombustible finish extends a horizontal distance of not less than 4 feet (1220 mm) on both sides of the fire wall.
Buildings or spaces on both sides of the intersecting fire wallshall assume to have an imaginary lot lineat the fire walland extending beyond the exterior of the fire wall. The location of the assumed line in relation to the exterior wallsand the fire wall shall be such that the exterior walland opening protection meet the requirements set forth in Sections 705.5 and 705.8. Such protection is not required for exterior wallsterminating at fire wallsthat form an angle equal to or greater than 180 degrees (3.14 rad).
Fire wallsshall extend to the outer edge of horizontal projecting elements such as balconies, roof overhangs, canopies, marquees and similar projections that are within 4 feet (1220 mm) of the fire wall.
Exceptions:
Horizontal projecting elements without concealed spaces, provided theexterior wallbehind and below the projecting element has not less than 1-hour fire-resistance-rated construction for a distance not less than the depth of the projecting element on both sides of the fire wall. Openings within such exterior wallsshall be protected by opening protectives having afire protection ratingof not less than 3/4 hour.
Noncombustible horizontal projecting elements with concealed spaces, provided a minimum 1-hour fire-resistance-rated wall extends through the concealed space. The projecting element shall be separated from the building by not less than 1-hour fire-resistance-rated construction for a distance on each side of thefire wallequal to the depth of the projecting element. The wall is not required to extend under the projecting element where the building exterior wallis not less than 1-hour fire-resistance rated for a distance on each side of the fire wallequal to the depth of the projecting element. Openings within such exterior wallsshall be protected by opening protectives having a fire protection ratingof not less than 3/4 hour.
For combustible horizontal projecting elements with concealed spaces, thefire wallneed only extend through the concealed space to the outer edges of the projecting elements. The exterior wallbehind and below the projecting element shall be of not less than 1-hour fire-resistance-rated construction for a distance not less than the depth of the projecting elements on both sides of the fire wall. Openings within such exterior wallsshall be protected by opening protectives having a fire-protection rating of not less than 3/4 hour.
Openings in the roof shall not be located within 4 feet (1220 mm) of thefire wall.
Each building shall be provided with not less than a Class B roof covering.
Walls shall be permitted to terminate at the underside of noncombustible roof sheathing, deck or slabs where both buildings are provided with not less than a Class B roof covering. Openings in the roof shall not be located within 4 feet (1220 mm) of the fire wall.
In buildings of Type III, IV and V construction, walls shall be permitted to terminate at the underside of combustible roof sheathing or decks, provided:
There are no openings in the roof within 4 feet (1220 mm) of the fire wall,
The roof is covered with a minimum Class B roof covering, and
The roof sheathing or deck is constructed of fire-retardant-treated woodfor a distance of 4 feet (1220 mm) on both sides of the wall or the roof is protected with 5/8-inch (15.9 mm) Type X gypsum board directly beneath the underside of the roof sheathing or deck, supported by not less than 2-inch (51 mm) nominal ledgers attached to the sides of the roof framing members for a distance of not less than 4 feet (1220 mm) on both sides of the fire wall.
Where a fire wallserves as an exterior wallfor a building and separates buildings having different roof levels, such wall shall terminate at a point not less than 30 inches (762 mm) above the lower roof level, provided the exterior wallfor a height of 15 feet (4572 mm) above the lower roof is not less than 1-hour fire-resistance-rated construction from both sides with openings protected by fire assemblies having afire protection ratingof not less than 3/4 hour.
Exception:
Where the fire wallterminates at the underside of the roof sheathing, deck or slab of the lower roof, provided:
Where a fire wallserves as an interior wall for a building, and the roof on one side or both sides of the fire wall slopes toward the fire wall at a slope greater than two units vertical in 12 units horizontal (2:12), the fire wallshall extend to a height equal to the height of the roof located 4 feet (1219 mm) from the fire wallplus 30 inches (762 mm). In no case shall the extension of the fire wall be less than 30 inches (762 mm).
Adjacent combustible members entering into a concrete or masonryfire wallfrom opposite sides shall not have less than a 4-inch (102 mm) distance between embedded ends. Where combustible members frame into hollowwalls or walls of hollow units, hollow spaces shall be solidly filled for the full thickness of the wall and for a distance not less than 4 inches (102 mm) above, below and between the structural members, with noncombustible materials approvedfor fireblocking.
Each opening through a fire wallshall be protected in accordance with Section 716.5 and shall not exceed 156 square feet (15 m2). The aggregate width of openings at any floor level shall not exceed 25 percent of the length of the wall.
Exceptions:
Openings are not permitted in party walls constructed in accordance with Section 706.1.1.
Openings shall not be limited to 156 square feet (15 m2) where both buildings are equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1.
Ducts and air transfer openings shall not penetrate fire walls.
Exception:
Penetrations by ducts and air transfer openings of fire wallsthat are not on a lot lineshall be allowed provided the penetrations comply with Section 717. The size and aggregate width of all openings shall not exceed the limitations of Section 706.8.
Fire barriersshall extend from the top of the foundation or floor/ceiling assembly below to the underside of the floor or roof sheathing, slab or deck above and shall be securely attached thereto. Such fire barriersshall be continuous through concealed space, such as the space above a suspended ceiling. Joints and voids at intersections shall comply with Sections 707.8 and 707.9
Supporting construction for 1-hour fire barriersrequired by Table 509 in buildings of Type IIB, IIIB and VB construction is not required to be fire-resistance rated unless required by other sections of this code.
Openings shall not be limited to 156 square feet (15 m2
) where adjoining floor areas are equipped throughout with an automatic sprinkler system in accordance with Section 903.
3.1.1.
Openings shall not be limited to 156 square feet (15 m2
) or an aggregate width of 25 percent of the length of the wall where the opening protective has been tested in accordance with ASTM E119 or UL 263 and has a minimum fire-resistance ratingnot less than the fire-resistance ratingof
the wall.
Fire window assemblies permitted in atrium separation walls
shall not be limited to a maximum aggregate width of 25 percent
of the length of the wall.
The voids created at the intersection of a fire barrierand a nonfire-resistance-rated roof assembly or a nonfire-resistance-rated exterior wall assembly shall be filled.
A
material or system
tested in accordance with ASTM E814 and ASTM E119, or batts or blankets of mineral wool or mineral fiber
shall be used to fill the void, and shall be securely installed in or on the intersection for its entire length so as not to dislodge, loosen or otherwise impair its ability to accommodate expected building movements and to retard the passage of fire and hot gases.
Batts or blankets of mineral wool or fiber mineral may be used to fill voids up to 2 inches (50.8 mm) when the entire width of the fire barrier is filled. The maximum void width for other approved materials shall not be greater than 1/2 inch (12.7 mm) unless the installation instructions of the material used in the void allow the fill of larger voids.
Fire partitions shall extend from the top of the foundation or floor/ceiling assembly below to the underside of the floor or roof sheathing, slab or deck above or to the fire-resistance-rated floor/ceiling or roof/ceiling assembly above, and shall be securely attached thereto. In combustible construction where the fire partitionsare not required to be continuous to the sheathing, deck or slab, the space between the ceiling and the sheathing, deck or slab above shall be fireblocked or draftstopped in accordance with Sections 718.2 and 718.3 at the partition line. The supporting construction shall be protected to afford the required fire-resistance ratingof the wall supported, except for walls separating tenant spaces in covered and open mall buildings, walls separating dwelling units, walls separating sleeping units and corridorwalls, in buildings of Type IIB, IIIB and VB construction.
Exceptions:
The wall need not be extended into the crawl space below where the floor above the crawl space has a minimum 1-hour fire-resistance rating.
Where the room-side fire-resistance-rated membrane of the corridoris carried through to the underside of the floor or roof sheathing, deck or slab of a fire-resistance-rated floor or roof above, the ceiling of the corridor shall be permitted to be protected by the use of ceiling materials as required for a 1-hour fire-resistance-rated floor or roof system.
Where the corridorceiling is constructed as required for the corridorwalls, the walls shall be permitted to terminate at the upper membrane of such ceiling assembly.
Atticfireblocking or draftstopping is not required at the partition line in Group R-2 buildings that do not exceed four stories above grade plane, provided the atticspace is subdivided by draftstopping into areas not exceeding 3,000 square feet (279 m2) or above every two dwelling units, whichever is smaller.
Fireblocking or draftstopping is not required at the partition line in buildings equipped with an automatic sprinkler systeminstalled throughout in accordance with Section 903.3.1.1 or 903.3.1.2, provided that automatic sprinklers are installed in combustible floor/ceiling and roof/ceiling spaces.
Smoke barriersshall form an effective membrane continuous from the top of the foundation or floor/ ceiling assembly below to the underside of the floor or roof sheathing, deck or slab above, including continuity through concealed spaces, such as those found above suspended ceilings, and interstitial structural and mechanical spaces. The supporting construction shall be protected to afford the required fire-resistance ratingof the wall or floor supported in buildings of other than Type IIB, IIIB or VB construction. Smoke barrierwalls used to separate smoke compartments shall comply with Section 709.4.1. Smoke-barrierwalls used to enclose areas of refuge in accordance with Section 1009.6.4 or to enclose elevator lobbies in accordance with Section 405.4.3, 3007.6.2, or 3008.6.2 shall comply with Section 709.4.2.
Exception:Smoke-barrierwalls are not required in interstitial spaces where such spaces are designed and constructed with ceilings or exterior wallsthat provide resistance to the passage of fire and smoke equivalent to that provided by the smoke-barrierwalls.
In Group I-1Condition 2, Group I-2 and ambulatory care facilities, where a pair of opposite-swinging doors are installed across a corridor in accordance with Section 709.5.1, the doors shall not be required to be protected in accordance with Section 716. The doors shall be close fitting within operational
tolerances, and shall not have a center mullion or undercuts in
excess of 3/4 inch (19.1 mm), louvers or
grilles. The doors shall have head and jamb stops, and astragals or rabbets at meeting edges. Where permitted by the door manufacturer's listing, positive-latching devices are not required.
In Group I-2 and ambulatory care facilities, where doors are installed across a corridor, the doors shall be automatic-closing by smoke detection in accordance with Section 716.5.9.3 and shall have a vision panel with fire-protection-rated glazing materials in fire-protection-rated frames, the area of which shall not exceed that tested.
Smoke partitions shall extend from the top of the foundation or floor below to the underside of the floor or roof sheathing, deck or slab above or to the underside of the ceiling above where the ceiling membrane is constructed to limit the transfer of smoke.
Where required elsewhere in the code, doors in smoke partitions shall meet the requirements for a smoke and draft control door assembly tested in accordance with UL 1784. The air leakage rate of the door assembly shall not exceed 3.0 cubic feet per minute per square foot [0.015424 m3/(s • m2)] of door opening at 0.10 inch (24.9 Pa) of water for both the ambient temperature test and the elevated temperature exposure test. Installation of smoke doors shall be in accordance with NFPA 105.
Where required elsewhere in the code, doors in smoke partitions shall be self- or automatic-closing by smoke detection in accordance with Section 716.5.9.3.
The space around a duct penetrating a smoke partition shall be filled with an approvedmaterial to limit the free passage of smoke. Air transfer openings in smoke partitions shall be provided with a smoke dampercomplying with Section 717.3.2.2.
Exception: Where the installation of a smoke damperwill interfere with the operation of a required smoke control system in accordance with Section 909, approvedalternative protection shall be utilized.
Exception: In buildings of Type IIB, IIIB or VB construction, the construction supporting the horizontal assemblyis not required to be fire-resistance rated at the following:
Where a horizontal assemblyis required by other sections of this code, the assembly shall have a fire-resistance ratingof not less than that required by that section.
Where the weight of lay-in ceiling panels, used as part of fire-resistance-rated floor/ceiling or roof/ceiling assemblies, is not adequate to resist an upward force of 1 pound per square foot (48 Pa), wire or other approveddevices shall be installed above the panels to prevent vertical displacement under such upward force.
In 1-hour fire-resistance-rated floor/ceiling assemblies, the ceiling membrane is not required to be installed over unusable crawl spaces. In 1-hour fire-resistance-rated roof assemblies, the floor membrane is not required to be installed where unusable atticspace occurs above.
Protection by a draft curtain and closely spaced sprinklers in accordance with NFPA 13 shall be permitted where the area of the vertical opening between stories does not exceed twice the horizontal projected area of the escalator. In other than Groups B and M, this application is limited to openings that do not connect more than four stories.
Protection of the vertical opening by approved shutters at every penetrated floor shall be permitted in accordance with this section. The shutters shall be of noncombustible construction and have a fire-resistance ratingof not less than 1.5 hours. The shutter shall be so constructed as to close immediately upon the actuation of a smoke detector installed in accordance with Section 907.3.1 and shall completely shut off the well opening. Escalators shall cease operation when the shutter begins to close. The shutter shall operate at a speed of not more than 30 feet per minute (152.4 mm/s) and shall be equipped with a sensitive leading edge to arrest its progress where in contact with any obstacle, and to continue its progress on release there from.
Joints made in or between horizontal assembliesshall comply with Section 715. The void created at the intersection of a floor/ceiling assembly and an exterior curtain wall assembly shall be permitted where protected in accordance with Section 715.4.
Penetrations by ducts and air transfer openings shall be protected in accordance with Section 717. Grease ducts shall be protected in accordance with the International Mechanical Code.
In other than Groups I-2 and I-3, a vertical opening that is not used as one of the applications listed in this section shall be permitted if the opening complies with all of the items below:
Vertical openings for automobile ramps in open and enclosed parking garages shall be permitted where constructed in accordance with Sections 406.5 and 406.6, respectively.
Vertical openings for elevator hoistways in open or enclosed parking garages that serve only the parking garage, and complying with Sections 406.5 and 406.6, respectively, shall be permitted.
Vertical openings for mechanical exhaust or supply duct systems in open or enclosed parking garages complying with Sections 406.5 and 406.6, respectively, shall be permitted to be unenclosed where such duct system is contained within and serves only the parking garage.
Access doors shall be permitted in ceilings of fire-resistance-rated floor/ceiling and roof/ceiling assemblies, provided such doors are tested in accordance with ASTM E119 or UL 263 as horizontal assemblies and labeled by an approved agency for such purpose.
The provisions of this section shall apply to shafts required to protect openings and penetrations through floor/ceiling and roof/ceiling assemblies. Interior exit stairwaysand rampsshall be enclosed in accordance with Section 1023.
The fire-resistance-rated room separation is not required, provided there are no openings in or penetrations of the shaft enclosure to the interior of the building except at the bottom. The bottom of the shaft shall be closed off around the penetrating items with materials permitted by Section 718.3.1 for draftstopping, or the room shall be provided with an approvedautomatic sprinkler system.
A shaft enclosure containing a waste or linen chute shall not be used for any other purpose and shall discharge in a room protected in accordance with Section 713.13.4.
The fire-resistance-rated room separation and the protection at
the bottom of the shaft are not required provided there are no
combustibles in the shaft and there are no openings or other penetrations through the shaft enclosure to the interior of the building.
Waste and linen chutes shall comply with the provisions of NFPA 82, Chapter 5 and shall meet the requirements of Sections 713.13.1 through 713.13.6. Incinerator rooms shall meet the provisions of Sections 713.13.4 through 713.13.5.
Exception:
Chutes serving and contained within a single dwelling unit.
A shaft enclosure containing a recycling, or waste or linen chute shall not be used for any other purpose and shall be enclosed in accordance with Section 713.4. Openings into the shaft, from access rooms and discharge rooms, shall be protected in accordance with this section and Section 716. Openings into chutes shall not be located in corridors. Doors into chutes shall be self-closing. Discharge doors shall be self- or automatic-closing upon the actuation of a smoke detector in accordance with Section 716.5.9.3, except that heat-activated closing devices shall be permitted between the shaft and the discharge room.
Access openings for waste or linen chutes shall be located in rooms or compartments enclosed by not less than 1-hour fire barriersconstructed in accordance with Section 707 or horizontal assembliesconstructed in accordance with Section 711, or both. Openings into the access rooms shall be protected by opening protectives having a fire protection ratingof not less than 3/4 hour. Doors shall be self- or automatic-closing upon the detection of smoke in accordance with Section 716.5.9.3.
Waste or linen chutes shall discharge into an enclosed room separated by fire barrierswith a fire-resistance ratingnot less than the required fire rating of the shaft enclosure and constructed in accordance with Section 707 or horizontal assembliesconstructed in accordance with Section 711, or both. Openings into the discharge room from the remainder of the building shall be protected by opening protectives having a fire protection rating equal to the protection required for the shaft enclosure. Doors shall be self- or automatic-closing upon the detection of smoke in accordance with Section 716.5.9.3. Waste chutes shall not terminate in an incinerator room. Waste and linen rooms that are not provided with chutes need only comply with Table 509.
Penetrations of fire-resistance-rated walls by ducts that are not protected with dampers shall comply with Sections 714.2 through 714.3.3. Penetrations of horizontal assembliesnot protected with a shaft as permitted by Section 717.6, and not required to be protected with fire dampers by other sections of this code, shall comply with Sections 714.4 through 714.5.2. Ducts and air transfer openings that are protected with dampers shall comply with Section 717.
Where sleeves are used, they shall be securely fastened to the assembly penetrated. The space between the item contained in the sleeve and the sleeve itself and any space between the sleeve and the assembly penetrated shall be protected in accordance with this section. Insulation and coverings on or in the penetrating item shall not penetrate the assembly unless the specific material used has been tested as part of the assembly in accordance with this section.
Exception: Where the penetrating items are steel, ferrous or copper pipes, tubes or conduits, the annular spacebetween the penetrating item and the fire-resistance-rated wall is permitted to be protected by either of the following measures:
In concrete or masonrywalls where the penetrating item is a maximum 6-inch (152 mm) nominal diameter and the area of the opening through the wall does not exceed 144 square inches (0.0929 m2), concrete, grout or mortar is permitted where installed the full thickness of the wall or the thickness required to maintain the fire-resistance rating.
The material used to fill the annular spaceshall prevent the passage of flame and hot gases sufficient to ignite cotton waste when subjected to ASTM E119 or UL 263 time-temperature fire conditions under a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water at the location of the penetration for the time period equivalent to the fire-resistance rating of the construction penetrated.
Through penetrations shall be protected by an approvedpenetration firestop system installed as tested in accordance with ASTM E814 or UL 1479, with a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water and shall have an F rating of not less than the required fire-resistance ratingof the wall penetrated.
Membrane penetrations of maximum 2-hour fire-resistance-rated walls and partitions by steel electrical boxes that do not exceed 16 square inches (0.0 103 m2) in area, provided the aggregate area of the openings through the membrane does not exceed 100 square inches (0.0645 m2) in any 100 square feet (9.29 m2) of wallarea. The annular spacebetween the wall membrane and the box shall not exceed 1/8 inch (3.2 mm). Such boxes on opposite sides of the wall or partition shall be separated by one of the following:
By a horizontal distance of not less than 24 inches (610 mm) where the wall or partition is constructed with individual noncommunicating stud cavities;
By a horizontal distance of not less than the depth of the wall cavity where the wall cavity is filled with cellulose loose-fill, rockwool or slag mineral wool insulation;
By protecting both outlet boxes with listed putty pads; or
By other listed materials and methods.
Membrane penetrations by listed electrical boxes of any material, provided such boxes have been tested for use in fire-resistance-rated assemblies and are installed in accordance with the instructions included in the listing. The annular spacebetween the wall membrane and the box shall not exceed 1/8 inch (3.2 mm) unless listed otherwise. Such boxes on opposite sides of the wall or partition shall be separated by one of the following:
By the horizontal distance specified in the listing of the electrical boxes;
By protecting both boxes with listed putty pads; or
By other listed materials and methods.
Membrane penetrations by electrical boxes of any size or type, that have been listed as part of a wall opening protective material system for use in fire-resistance-rated assemblies and are installed in accordance with the instructions included in the listing.
Membrane penetrations by boxes other than electrical boxes, provided such penetrating items and the annular space between the wall membrane and the box, are protected by an approvedmembrane penetration firestop system installed as tested in accordance with ASTM E814 or UL 1479, with a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water, and shall have an F and T rating of not less than the required fire-resistance rating of the wall penetrated and be installed in accordance with their listing.
The annular space created by the penetration of an automatic sprinkler, provided it is covered by a metal escutcheon plate.
Membrane penetrations of maximum 2-hour fire resistance-ratedwalls and partitions by steel electrical boxes that exceed 16 square inches (0.0 103 m2) in area, or steel electrical boxes of any size having an aggregate area through the membrane exceeding 100 square inches (0.0645 m2) in any 100 square feet (9.29 m2) of wallarea, provided such penetrating items are protected by listed putty pads or other listed materials and methods, and installed in accordance with the listing.
Noncombustible penetrating items shall not connect to combustible items beyond the point of firestopping unless it can be demonstrated that the fire-resistance integrity of the wall is maintained.
Penetrations of a fire-resistance-rated floor, floor/ceiling assembly or the ceiling membrane of a roof/ceiling assembly not required to be enclosed in a shaft by Section 712.1 shall be protected in accordance with Sections 714.4.1 through 714.4.4.
Penetrations by steel, ferrous or copper conduits, pipes, tubes or vents or concrete or masonry items through a single fire-resistance-rated floor assembly where the annular spaceis protected with materials that prevent the passage of flame and hot gases sufficient to ignite cotton waste when subjected to ASTM E119 or UL 263 time-temperature fire conditions under a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water at the location of the penetration for the time period equivalent to the fire-resistance rating of the construction penetrated. Penetrating items with
a maximum 6-inch (152 mm) nominal diameter shall not be limited to the penetration of a single fire-resistance-rated floor assembly, provided the aggregate area of the openings through the assembly does not exceed 144 square inches (92 900 m
m2) in any 100 square feet (9.3 m2) of floor area.
Penetrations in a single concrete floor by steel, ferrous or copper conduits, pipes, tubes or vents with a maximum 6-inch (152 mm) nominal diameter, provided the concrete, grout or mortar is installed the full thickness of the floor or the thickness required to maintain the fire-resistance rating. The penetrating items shall not be limited to the penetration of a single concrete floor, provided the area of the opening through each floor does not exceed 144 square inches (92 900 mm2).
Penetrations by listed electrical boxes of any material, provided such boxes have been tested for use in fire-resistance-rated assemblies and installed in accordance with the instructions included in the listing.
Through penetrations shall be protected by an approvedthrough-penetration firestop systeminstalled and tested in accordance with ASTM E814 or UL 1479, with a minimum positive pressure differential of 0.01 inch of water (2.49 Pa). The system shall have an F rating/T rating of not less than 1 hour but not less than the required rating of the floor penetrated.
Exceptions:
Floor penetrations contained and located within the cavity of a wall above the floor or below the floor do not require a T rating.
Floor penetrations by floor drains, tub drains or shower drains contained and located within the concealed space of a horizontal assembly do not require a T rating.
Floor penetrations of maximum 4-inch (102 mm) nominal diameter penetrating directly into metal-enclosed electrical power switchgear do not
require a T rating.
Membrane penetrationsby steel, ferrous or copper conduits, pipes, tubes or vents, or concrete or masonry items where the annular spaceis protected either in accordance with Section 714.4.1 or to prevent the free passage of flame and the products of combustion. The aggregate area of the openings through the membrane shall not exceed 100 square inches (64 500 mm2) in any 100 square feet (9.3 m2) of ceiling area in assemblies tested without penetrations.
Ceiling membrane penetrationsof maximum 2-hour horizontal assembliesby steel electrical boxes that do not exceed 16 square inches (10 323 mm2) in area, provided the aggregate area of such penetrations does not exceed 100 square inches (44 500 mm2) in any 100 square feet (9.29 m2) of ceiling area, and the annular space between the ceiling membrane and the box does not exceed 1/8 inch (3.2 mm).
Membrane penetrationsby electrical boxes of any size or type, that have been listed as part of an opening protective material system for use in horizontal assembliesand are installed in accordance with the instructions included in the listing.
Membrane penetrations by listed electrical boxes of any material, provided such boxes have been tested for use in fire-resistance-rated assemblies and are installed in accordance with the instructions included in the listing. Theannular space between the ceiling membrane and the box shall not exceed 1/8 inch (3.2 mm) unless listed otherwise.
The annular spacecreated by the penetration of a fire sprinkler, provided it is covered by a metal escutcheon plate.
Noncombustible items that are cast into concretebuilding elements and that do not penetrate both top and bottom surfaces of the element.
The ceiling membrane of 1- and 2-hour fire-resistance-rated horizontal assembliesis permitted to be interrupted with the double wood top plate of a wall assembly, provided that all penetrating items through the double top plate are protected in accordance with Section 714.4.1.1 or 714.4.1.2 and the ceiling membrane is tight to the top plate. For 2-hour fire-resistance-rated horizontal assemblies the wall assembly must be sheathed with Type X gypsum wallboard.
The delayed effective date of this Rule is January 1, 2021. The Statutory authority for Rule-making is G. S. 143-136; 143-138.
UpCodes note: Prior to January 1, 2021, the 7th exception was:
"7. The ceiling membrane of 1- and 2-hour fire-resistance-rated horizontal assembliesis permitted to be interrupted with the double wood top plate of a wall assembly that is sheathed with Type X gypsum wallboard, provided that all penetrating items through the double top plates are protected in accordance with Section 714.4.1.1 or 714.4.1.2 and the ceiling membrane is tight to the top plates."
Noncombustible penetrating items shall not connect to combustible materials beyond the point of firestopping unless it can be demonstrated that the fire-resistance integrity of the horizontal assemblyis maintained.
Penetrations in smoke barriersshall be protected by an approvedthrough-penetration firestop systeminstalled and tested in accordance with the requirements of UL 1479 for air leakage. The L ratingof the system measured at 0.30 inch (7.47 Pa) of water in both the ambient temperature and elevated temperature tests shall not exceed:
Penetrations of nonfire-resistance-rated floor or floor/ceiling assemblies or the ceiling membrane of a nonfire-resistance-rated roof/ceiling assembly shall meet the requirements of Section 713 or shall comply with Section 714.5.1 or 714.5.2.
Noncombustible penetrating items that connect not more than five stories are permitted, provided that the annular spaceis filled to resist the free passage of flame and the products of combustion with an approved noncombustible material or with a fill, void or cavity material that is tested and classified for use inthrough-penetration firestop systems.
Penetrating items that connect not more than two storiesare permitted, provided that the annular spaceis filled with an approved material to resist the free passage of flame and the products of combustion.
The void created at the intersection of a floor/ceiling assembly and an exterior curtain wall assembly shall be protected in accordance with Section 715.4.
A fire-resistant joint systemshall be securely installed in accordance with the listing criteria in or on the joint for its entire length so as not to dislodge, loosen or otherwise impair its ability to accommodate expected building movements and to resist the passage of fire and hot gases.
Fire-resistant joint systemsshall be tested in accordance with the requirements of either ASTM E1966 or UL 2079. Nonsymmetrical walljoint systems shall be tested with both faces exposed to the furnace, and the assigned fire-resistance ratingshall be the shortest duration obtained from the two tests. Where evidence is furnished to show that the wall was tested with the least fire-resistant side exposed to the furnace, subject to acceptance of the building official, the wall need not be subjected to tests from the opposite side.
Exception:
For exterior wallswith a horizontal fire separation distancegreater than 5 feet (1524 mm), the joint system shall be required to be tested for interior fire exposure only.
Where fire resistance-rated floor or floor/ceiling assemblies are required, voids created at the intersection of the exterior curtain wall assemblies and such floor assemblies shall be sealed with an approvedsystem to prevent the interior spread of fire. Such systems shall be securely installed and tested in accordance with ASTM E2307 to provide an F ratingfor a time period not less than the fire-resistance ratingof the floor assembly. Height and fire-resistance requirements for curtain wall spandrels shall comply with Section 705.8.5.
Exception: Voids created at the intersection of the exterior curtain wall assemblies and such floor assemblies where the vision glass extends to the finished floor level shall be permitted to be sealed with an approved material to prevent the interior spread of fire. Such material shall be securely installed and capable of preventing the passage of flame and hot gases sufficient to ignite cotton waste where subjected to ASTM E119 time-temperature fire conditions under a minimum positive pressure differential of 0.01 inch (0.254 mm) of water column (2.5 Pa) for the time period not less than the fire-resistance ratingof the floor assembly.
Voids created at the intersection of exterior curtain wall assemblies and nonfire-resistance-rated floor or floor/ceiling assemblies shall be sealed with an approvedmaterial or system to retard the interior spread of fire and hot gases between stories.
Voids created at the intersection of nonfire-resistance-rated exterior curtain wall assemblies and fire barriersshall be filled. An approved material or system shall be used to fill the void and shall be securely installed in or on the intersection for its entire length so as not to dislodge, loosen or otherwise impair its ability to accommodate expected building movements and to retard the passage of fire and hot gases.
Fire-resistant joint systemsin smoke barriers, and joints at the intersection of a horizontal smoke barrierand an exterior curtain wall, shall be tested in accordance with the requirements of UL 2079 for air leakage. The L ratingof the joint system shall not exceed 5 cfm per linear foot (0.00775 m3/s m) of joint at 0.30 inch (7.47 Pa) of water for both the ambient temperature and elevated temperature tests.
Fire-resistance-rated glazing tested as part of a fire-resistance-rated wall or floor/ceiling assembly in accordance with ASTM E119 or UL 263 and labeled in accordance with Section 703.6 shall not otherwise be required to comply with this section where used as part of a wall or floor/ceiling assembly. Fire-resistance-rated glazing shall be permitted in fire door and fire window assemblieswhere tested and installed in accordance with their listings and where in compliance with the requirements of this section.
For fire-rated glazing, the labelshall bear the identification required in Tables 716.3 and 716.5. "D" indicates that the glazing is permitted to be used in fire door assemblies and that the glazing meets the fire protection requirements of NFPA 252. "H" shall indicate that the glazing meets the hose stream requirements of NFPA 252. "T" shall indicate that the glazing meets the temperature requirements of Section 716.5.5.1. The placeholder "XXX" represents the fire-rating period, in minutes.
For fire-protection-rated glazing, the labelshall bear the following identification required in Tables 716.3 and 716.6: "OH — XXX." "OH" indicates that the glazing meets both the fire protection and the hose-stream requirements of NFPA 257 or UL 9 and is permitted to be used in fire window openings. The placeholder "XXX" represents the fire-rating period, in minutes.
Fire-rated glazingassemblies marked as complying with hose stream requirements (H) shall be permitted in applications that do not require compliance with hose stream requirements. Fire-rated glazingassemblies marked as complying with temperature rise requirements (T) shall be permitted in applications that do not require compliance with temperature rise requirements. Fire-rated glazingassemblies marked with ratings (XXX) that exceed the ratings required by this code shall be permitted.
The application of any of the alternative methods listed in this section shall be based on the fire exposure and acceptance criteria specified in NFPA 252, NFPA 257 or UL 9. The required fire resistanceof an opening protective shall be permitted to be established by any of the following methods or procedures:
Engineering analysis based on a comparison of opening protective designs having fire protection ratingsas determined by the test procedures set forth in NFPA 252, NFPA 257 or UL 9.
Alternative protection methods as allowed by Section 104.11.
Approvedfire doorand fire shutter assemblies shall be constructed of any material or assembly of component materials that conforms to the test requirements of Section 716.5.1, 716.5.2 or 716.5.3 and the fire protection ratingindicated in Table 716.5. Fire doorframes with transom lights, sidelights or both shall be permitted in accordance with Section 716.5.6. Fire door assemblies and shutters shall be installed in accordance with the provisions of this section and NFPA 80.
Exceptions:
Labeled protective assemblies that conform to the requirements of this section or UL 10A, UL 14B and UL 14C for tin-clad fire door assemblies.
Fire door assemblies with side-hinged and pivoted swinging doors shall be tested in accordance with NFPA 252 or UL 10C. After 5 minutes into the NFPA 252 test, the neutral pressure level in the furnace shall be established at 40 inches (1016 mm) or less above the sill.
Fire door assemblies with other types of doors, including swinging elevator doors, horizontal sliding fire door assemblies, and fire shutter assemblies, bottom and side-hinged chute intake doors, and top-hinged chute discharge doors, shall be tested in accordance with NFPA 252 or UL 10B. The pressure in the furnace shall be maintained as nearly equal to the atmospheric pressure as possible. Once established, the pressure shall be maintained during the entire test period.
Viewports that require a hole not larger than 1 inch (25 mm) in diameter through the door, have not less than a 0.25-inch-thick (6.4 mm) glass disc and the holder is of metal that will not melt out where subject to temperatures of 1,700°F (927°C).
Unprotected openings shall be permitted for corridorsin multitheater complexes where each motion picture auditorium has not fewer than one-half of its required exitor exit access doorwaysopening directly to the exterior or into an exit passageway.
Fire door assemblies shall meet the requirements for a smoke and draft control door assembly tested in accordance with UL 1784. The air leakage rate of the door assembly shall not exceed 3.0 cubic feet per minute per square foot (0.01524 m3/s • m2) of door opening at 0.10 inch (24.9 Pa) of water for both the ambient temperature and elevated temperature tests. Louvers shall be prohibited. Installation of smoke doors shall be in accordance with NFPA 105.
In a 20-minute fire door assembly, the glazing material in the door itself shall have a minimum fire-protection-rated glazing of 20 minutes and shall be exempt from the hose stream test. Glazing material in any other part of the door assembly, including transom lights and sidelights, shall be tested in accordance with NFPA 257 or UL 9, including the hose stream test, in accordance with Section 716.6.
Fire-protection-rated glazing in excess of 100 square inches (0.065 m2) is not permitted. Fire-resistance-rated glazing in excess of 100 square inches (0.065 m2) shall be permitted in fire doors. Listed fire-resistance-rated glazing in a fire doorshall have a maximum transmitted temperature rise in accordance with Section 716.5.5 when the fire dooris tested in accordance with NFPA 252, UL 10B or UL 10C.
Door frames with transom lights, sidelights or both, shall be permitted where a 3/4-hour fire protection ratingor less is required in accordance with Table 716.5. Fire doorframes with transom lights, sidelights, or both, installed with fire-resistance-rated glazing tested as an assembly in accordance with ASTM E119 or UL 263 shall be permitted where a fire protection rating exceeding 3/4 hour is required in accordance with Table 716.5.
Fire doorsshall be labeled showing the name of the manufacturer or other identification readily traceable back to the manufacturer, the name or trademark of the third-party inspection agency, the fire protection ratingand, where required for fire doorsin interior exit stairways and ramps and exit passageways by Section 716.5.5, the maximum transmitted temperature end point. Smoke and draft control doors complying with UL 1784 shall be labeled as such and shall comply with Section 716.5.7.3. Labels shall be approved and permanently affixed. The label shall be applied at the factory or location where fabrication and assembly are performed.
Listed light kits and louvers and their required preparations shall be considered as part of the labeled door where such installations are done under the listing program of the third-party agency. Fire doorsand door assemblies shall be permitted to consist of components, including glazing, vision light kits and hardware that are listed or classified and labeled for such use by different third-party agencies.
Oversized fire doorsshall bear an oversized fire doorlabelby an approved agencyor shall be provided with a certificate of inspection furnished by an approvedtesting agency. Where a certificate of inspection is furnished by an approvedtesting agency, the certificate shall state that the door conforms to the requirements of design, materials and construction, but has not been subjected to the fire test.
Smoke and draft control doors complying with UL 1784 shall be labeled in accordance with Section 716.5.7.1 and shall show the letter "S" on the fire-rating labelof the door. This marking shall indicate that the door and frame assembly are in compliance where listed or labeled gasketing is installed.
Fire-resistance-rated glazing shall comply with the size limitations in Section 716.5.8.1.1. Fire-protection-rated glazing shall comply with the size limitations of NFPA 80, and as provided in Section 716.5.8.1.2.
Fire-protection-rated glazing shall be permitted in fire doorshaving a 11/2-hour fire protection ratingintended for installation in fire barriers, where limited to 100 square inches (0.065 m2).
Approved fire-protection-rated glazing used in fire door assemblies in elevator, stairway and ramp enclosures shall be so located as to furnish clear vision of the passageway or approach to the elevator, stairway or ramp.
Fire-rated glazingshall bear a labelor other identification showing the name of the manufacturer, the test standard and information required in Table 716.3 that shall be issued by an approved agencyand shall be permanently identified on the glazing.
The elevator car doors and the associated hoistway enclosure doors at the floor level designated for recall in accordance with Section 3003.2 shall be permitted to remain open during Phase I emergency recall operation.
Unless otherwise specifically permitted, single fire doorsand both leaves of pairs of side-hinged swinging fire doorsshall be provided with an active latch bolt that will secure the door when it is closed.
Automatic-closing doors installed in the following locations shall be automatic-closing by the actuation of smoke detectors installed in accordance with Section 907.3 or by loss of power to the smoke detector or hold-open device. Doors that are automatic-closing by smoke detection shall not have more than a 10-second delay before the door starts to close after the smoke detector is actuated:
Doors installed in waste and linen chutes, discharge openings and access and discharge rooms in accordance with Section 713.13. Loading doors installed in waste and linen chutes shall meet the requirements of Sections 716.5.9 and 716.5.9.1.1.
Doors installed in the walls for compartmentation of underground buildings in accordance with Section 405.4.2.
Doors installed in the elevator lobby walls of underground buildings in accordance with Section 405.4.3.
Doors installed in smoke partitions in accordance with Section 710.5.2.3.
Vertical sliding or vertical rolling steel fire doorsin openings through which pedestrians travel shall be heat activated or activated by smoke detectors with alarm verification.
Where fire shutters of the swinging type are installed in exterior openings, not less than one row in every three vertical rows shall be arranged to be readily opened from the outside, and shall be identified by distinguishing marks or letters not less than 6 inches (152 mm) high.
NFPA 257 or UL 9 shall evaluate fire-protection-rated glazing under positive pressure. Within the first 10 minutes of a test, the pressure in the furnace shall be adjusted so not less than two-thirds of the test specimen is above the neutral pressure plane, and the neutral pressure plane shall be maintained at that height for the balance of the test.
Glazing in fire window assemblies shall be fire-protection-rated glazing installed in accordance with and complying with the size limitations set forth in NFPA 80.
Metal mullions that exceed a nominal height of 12 feet (3658 mm) shall be protected with materials to afford the same fire-resistance rating as required for the wall construction in which the protective is located.
Fire-protection-rated glazing requiring 45-minute opening protection in accordance with Table 716.6 shall be limited to fire partitions designed in accordance with Section 708 and fire barriers utilized in the applications set forth in Sections 707.3.6, 707.3.7 and 707.3.9 where the fire-resistance rating does not exceed 1 hour. Fire-resistance-rated glazing assemblies tested in accordance with ASTM E119 or UL 263 shall not be subject to the limitations of this section.
Fire-protection-rated glazing shall be permitted in window assemblies tested to NFPA 257 or UL 9 in smoke barriers and fire partitions requiring 1/3-hour opening protection in accordance with Table 716.6.
Fire-protection-rated glazing shall bear a label or other identification showing the name of the manufacturer, the test standard and information required in Section 716.3.2 and Table 716.6 that shall be issued by an approved agency and permanently identified on the glazing.
The provisions of this section shall govern the protection of duct penetrations and air transfer openings in assemblies required to be protected and duct penetrations in nonfire-resistance-rated floor assemblies.
Ducts transitioning horizontally between shafts shall not require a shaft enclosure provided that the duct penetration into each associated shaft is protected with dampers complying with this section.
Ducts that penetrate fire-resistance-rated assemblies and are not required by this section to have dampers shall comply with the requirements of Sections 714.2 through 714.3.3. Ducts that penetrate horizontal assembliesnot required to be contained within a shaft and not required by this section to have dampers shall comply with the requirements of Sections 714.4 through 714.5.2.
Where the installation of a fire damperwill interfere with the operation of a required smoke control system in accordance with Section 909, approvedalternative protection shall be utilized. Where mechanical systems including ducts and dampers utilized for normal building ventilation serve as part of the smoke control system, the expected performance of these systems in smoke control mode shall be addressed in the rational analysis required by Section 909.4.
Ceiling radiation dampers shall comply with the requirements of UL 555C or shall be tested as part of a fire-resistance-rated floor/ceiling or roof/ceiling assembly in accordance with ASTM E119 or UL 263.
Corridor dampersshall comply with requirements of both UL 555 and UL 555S. Corridor dampersshall demonstrate acceptable closure performance when subjected to 150 feet per minute (0.76 mps) velocity across the face of the damper during the UL 555 fire exposure test.
The smoke dampershall close upon actuation of a listed smoke detector or detectors installed in accordance with Section 907.3 and one of the following methods, as applicable:
Where a smoke damperis installed within a duct, a smoke detector shall be installed inside the duct or outside the duct with sampling tubes protruding into the duct. The detector or tubes within the duct shall be within 5 feet (1524 mm) of the damper. Air outlets and inlets shall not be located between the detector or tubes and the damper. The detector shall be listed for the air
velocity, temperature and humidity anticipated at the point where it is installed. Other than in mechanical smoke control systems, dampers shall be closed upon fan shutdown where local smoke detectors require a minimum velocity to operate.
Where a smoke damperis installed above smoke barrierdoors in a smoke barrier, a spot-type detector shall be installed on either side of the smoke barrier door opening. The detector shall be listed for releasing service if used for direct interface with the damper.
Where a smoke damperis installed within an air transfer opening in a wall, a spot-type detector shall be installed within 5 feet
(1524 mm) horizontally of the damper. The detector shall be listed for releasing service if used for direct interface with the damper.
Where a smoke damperis installed in a corridorwall or ceiling, the damper shall be permitted to be controlled by a smoke detection system installed in the corridor.
Where a smoke detection system is installed in all areas served by the duct in which the damper will be located, the smoke dampersshall be permitted to be controlled by the smoke detection system.
The operating temperature of a ceiling radiation damperactuation device shall be 50°F (27.8°C) above the normal temperature within the duct system, but not less than 160°F (71°C).
Fire and smoke dampers shall be provided with an approvedmeans of access that is large enough to permitinspection and maintenance of the damper and its operating parts. The access shall not affect the integrity of fire-resistance-rated assemblies. The access openings shall not reduce the fire-resistance ratingof the assembly. Access points shall be permanently identified on the exterior by a labelhaving letters not less than 1/2 inch (12.7 mm) in height reading: FIRE/SMOKE DAMPER, SMOKE DAMPER or FIRE DAMPER. Access doors in ducts shall be tight fitting and suitable for the required duct construction.
Ducts and air transfer openings permitted in fire wallsin accordance with Section 706.11 shall be protected with listed fire dampersinstalled in accordance with their listing.
A listed smoke damperdesigned to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a fire wallthat serves as a horizontal exit.
Exception:Fire dampersare not required at penetrations of fire barrierswhere any of the following apply:
Penetrations are tested in accordance with ASTM E119 or UL 263 as part of the fire-resistance-rated assembly.
Ducts are used as part of an approvedsmoke control system in accordance with Section 909 and where the use of a fire damperwould interfere with the operation of a smoke control system.
Such walls are penetrated by ducted HVAC systems, have a required fire-resistance ratingof 1 hour or less, are in areas of other than Group H and are in buildings equipped throughout with an automatic sprinkler systemin accordance with Section 903.3.1.1 or 903.3.1.2. For the purposes of this exception, a ducted HVAC system shall be a duct system for conveying supply, return or exhaust air as part of the structure's HVAC system. Such a duct system shall be constructed of sheet steel not less than No. 26 gage thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals.
A listed smoke damperdesigned to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a fire barrierthat serves as a horizontal exit.
Shaft enclosures that are permitted to be penetrated by ducts and air transfer openings shall be protected with approvedfire and smoke dampers installed in accordance with their listing.
Exceptions:
Fire dampersare not required at penetrations of shafts where any of the following criteria are met:
Steel exhaust subducts are extended not less than 22 inches (559 mm) vertically in exhaust shafts, provided there is a continuous airflow upward to the outside.
Penetrations are tested in accordance with ASTM E119 or UL 263 as part of the fire-resistance-rated assembly.
Ducts are used as part of an approvedsmoke control system designed and installed in accordance with Section 909 and where the fire damper will interfere with the operation of the smoke control system.
The penetrations are in parking garage exhaust or supply shafts that are separated from other building shafts by not less than 2-hour fire-resistance-rated construction.
Kitchen, clothes dryer, bathroom and toilet room exhaust openings are installed with steel exhaust subducts, having a minimum wall thickness of 0.0187-inch (0.4712 mm) (No. 26 gage).
The subducts extend not less than 22 inches (559 mm) vertically.
An exhaust fan is installed at the upper terminus of the shaft that is powered continuously in accordance with the provisions of Section 909.11, so as to maintain a continuous upward airflow to the outside.
Smoke dampersare not required at penetration of exhaust or supply shafts in parking garages that are separated from other building shafts by not less than 2-hour fire-resistance-rated construction.
Smoke dampersare not required at penetrations of shafts where ducts are used as part of an approvedmechanical smoke control system designed in accordance with Section 909 and where the smoke damperwill interfere with the operation of the smoke control system.
Tenant partitions in covered and open mall buildingswhere the walls are not required by provisions elsewhere in the code to extend to the underside of the floor or roof sheathing, slab or deck above.
The duct system is constructed of approvedmaterials in accordance with the International Mechanical Codeand the duct penetrating the wall complies with all of the following requirements:
The duct shall not exceed 100 square inches (0.06 m2).
The duct shall be constructed of steel not less than 0.0217 inch (0.55 mm) in thickness.
The duct shall not have openings that communicate thecorridorwith adjacent spaces or rooms.
A minimum 12-inch-long (305 mm) by 0.060-inch-thick (1.52 mm) steel sleeve shall be centered in each duct opening. The sleeve shall be secured to both sides of the wall and all four sides of the sleeve with minimum 11/2-inch by 11/2-inch by 0.060-inch (38 mm by 38 mm by 1.52 mm) steel retaining angles. The retaining angles shall be secured to the sleeve and the wall with No. 10 (M5) screws. The annular space between the steel sleeve and the wall opening shall be filled with mineral woolbatting on all sides.
Such walls are penetrated by ducted HVAC systems, have a required fire-resistance ratingof 1 hour or less, and are in buildings equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2. For the purposes of this exception, a ducted HVAC system shall be a duct system for conveying supply, return or exhaust air as part of the structure's HVAC system. Such a duct system shall be constructed of sheet steel not less than No. 26 gage thickness and shall be continuous from the air-handling appliance or equipment to the air outlet and inlet terminals.
A ceiling radiation dampershall be provided where the ceiling membrane of a fire-resistance-rated floor-ceiling or roof-ceiling assembly, constructed as permitted in Section 708.4, Exception 2, is penetrated.
A listed smoke damper designed to resist the passage of smoke shall be provided at each point a duct or air transfer opening penetrates a corridor enclosure required to have smoke and draft control doors in accordance with Section 716.5.3.
Exceptions:
Smoke dampersare not required where the building is equipped throughout with an approvedsmoke control system in accordance with Section 909, and smoke dampersare not necessary for the operation and control of the system.
Smoke dampersare not required in corridorpenetrations where the duct is constructed of steel not less than 0.019 inch (0.48 mm) in thickness and there are no openings serving the corridor.
Ducts and air transfer openings in fire-resistance-rated exterior walls required to have protected openings in accordance with Section 705.10 shall be protected with listed fire dampersinstalled in accordance with their listing.
A listed smoke damperdesigned to resist the passage of smoke shall be provided at each point that an air transfer opening penetrates a smoke partition. Smoke dampersand smoke damperactuation methods shall comply with Section 717.3.3.2.
Exception:
Where the installation of a smoke damperwill interfere with the operation of a required smoke control system in accordance with Section 909, approvedalternative protection shall be utilized.
Penetrations by ducts and air transfer openings of a floor, floor/ceiling assembly or the ceiling membrane of a roof/ceiling assembly shall be protected by a shaft enclosure that complies with Section 713 or shall comply with Sections 717.6.1 through 717.6.3.
Exception:
A duct is permitted to penetrate three floors or less without a fire damperat each floor, provided such duct meets all of the following requirements:
The duct shall be contained and located within the cavity of a wall and shall be constructed of steel having a minimum wall thickness of 0.0187 inches (0.4712 mm) (No. 26 gage).
The duct shall open into only one dwelling or sleeping unitand the duct system shall be continuous from the unit to the exterior
of the building.
The duct shall not exceed 4-inch (102 mm) nominal diameter and the total area of such ducts shall not exceed 100 square inches (0.065 m2) in any 100 square feet (9.3 m2) of floor area.
The annular spacearound the duct is protected with materials that prevent the passage of flame and hot gases sufficient to ignite
cotton waste where subjected to ASTM E119 or UL 263 time-temperature conditions under a minimum positive pressure differential of 0.01 inch (2.49 Pa) of water at the location of the penetration for the time period equivalent to the fire-resistance ratingof the construction penetrated.
Ducts and air transfer openings constructed of approvedmaterials in accordance with the International Mechanical Codethat penetrate the ceiling membrane of a fire-resistance-rated floor/ceiling or roof/ceiling assembly shall be protected with one of the following:
A listed ceiling radiation damperinstalled at the ceiling line where a duct penetrates the ceiling of a fire-resistance-rated floor/ceiling or roof/ceiling assembly.
A listed ceiling radiation damperinstalled at the ceiling line where a diffuser with no duct attached penetrates the ceiling of a fire-resistance-rated floor/ceiling or roof/ceiling assembly.
Where exhaust duct penetrations are protected in accordance with Section 714.4.2, are located within the cavity of a wall and do not pass through another dwelling unitor tenant space.
Where duct and air transfer openings are protected with a duct outlet protection system tested as part of a fire-resistance-rated assembly in accordance with ASTM E119 or UL 263.
Duct systems constructed of approvedmaterials in accordance with the International Mechanical Codethat penetrate nonfire-resistance-rated floor assemblies shall be protected by any of the following methods:
The duct connects not more than two stories, and the annular spacearound the penetrating duct is protected with an approved noncombustible material that resists the free passage
of flame and the products of combustion.
In floor assemblies composed of noncombustible materials, a shaft shall not be required where the duct connects not more than three stories, the annular space around the penetrating duct is protected with an approved noncombustible material that resists the free passage of flame and the products of combustion and a fire damperis installed at each floor line.
Flexible ducts and air connectors shall not pass through any fire-resistance-rated assembly. Flexible air connectors shall not pass through any wall, floor or ceiling.
Fireblockingand draftstopping shall be installed in combustible concealed locations in accordance with this section. Fireblockingshall comply with Section 718.2. Draftstopping in floor/ceiling spaces and atticspaces shall comply with Sections 718.3 and 718.4, respectively. The permitted use of combustible materials in concealed spaces of buildings of Type I or II construction shall be limited to the applications indicated in Section 718.5.
In combustible construction, fireblockingshall be installed to cut off concealed draft openings (both vertical and horizontal) and shall form an effective barrier between floors, between a top storyand a roof or atticspace. Fireblockingshall be installed in the locations specified in Sections 718.2.2 through 718.2.7.
Batts or blankets of mineral woolor mineral fiberor other approvednonrigid materials shall be permitted for compliance with the 10-foot (3048 mm) horizontal fireblockingin walls constructed using parallel rows of studs or staggered studs.
Unfaced fiberglass batt insulation used as fireblockingshall fill the entire cross section of the wall cavity to a minimum height of 16 inches (406 mm) measured vertically. Where piping, conduit or similar obstructions are encountered, the insulation shall be packed tightly around the obstruction.
Loose-fill insulation material, insulating foam sealants and caulk materials shall not be used as a fireblock unless specifically tested in the form and manner intended for use to demonstrate its ability to remain in place and to retard the spread of fire and hot gases.
Batts or blankets of mineral or glass fiber or other approvednonrigid materials shall be allowed as fireblockingin walls constructed using parallel rows of studs or staggered studs.
Fireblockingshall be provided in concealed spaces of stud walls and partitions, including furred spaces, and parallel rows of studs or staggered studs, as follows:
Vertically at the ceiling and floor levels.
Horizontally at intervals not exceeding 10 feet (3048 mm).
Fireblockingshall be provided at interconnections between concealed vertical stud wall or partition spaces and concealed horizontal spaces created by an assembly of floor joists or trusses, and between concealed vertical and horizontal spaces such as occur at soffits, drop ceilings, cove ceilings and similar locations.
Fireblockingshall be provided in concealed spaces between stair stringers at the top and bottom of the run. Enclosed spaces under stairwaysshall comply with Section 1011.7.3.
Where required by Section 712.1.8, Exception 1 of Section 714.4.1.2 or Section 714.5, fireblockingof the annular spacearound vents, pipes, ducts, chimneys and fireplaces at ceilings and floor levels shall be installed with a material specifically tested in the form and manner intended for use to demonstrate its ability to remain in place and resist the free passage of flame and the products of combustion.
Fireblockingshall be installed within concealed spaces of exterior wall coverings and other exterior architectural elements where permitted to be of combustible construction as specified in Section 1406 or where erected with combustible frames. Fireblockingshall be installed at maximum intervals of 20 feet (6096 mm) in either dimension so that there will be no concealed space exceeding 100 square feet (9.3 m2) between fireblocking. Where wood furring strips are used, they shall be of approved wood of natural decay resistance or preservative-treated wood. If noncontinuous, such elements shall have closed ends, with not less than 4 inches (102 mm) of separation between sections.
Fireblockingshall not be required where the exterior wall covering is installed on noncombustible framing and the face of the exterior wall covering exposed to the concealed space is covered by one of the following materials:
Aluminum having a minimum thickness of 0.019 inch (0.5 mm).
Corrosion-resistant steel having a base metal thickness not less than 0.016 inch (0.4 mm) at any point.
Fireblockingshall not be required where the exterior wall covering has been tested in accordance with, and complies with the acceptance criteria of, NFPA 285. The exterior wall covering shall be installed as tested in accordance with NFPA 285.
Where wood sleepers are used for laying wood flooring on masonry or concretefire-resistance-rated floors, the space between the floor slab and the underside of the wood flooring shall be filled with an approvedmaterial to resist the free passage of flame and products of combustion or fireblocked in such a manner that there will be no open spaces under the flooring that will exceed 100 square feet (9.3 m2) in area and such space shall be filled solidly under permanent partitions so that there is no communication under the flooring between adjoining rooms.
In combustible construction, draftstopping shall be installed to subdivide floor/ceiling assemblies in the locations prescribed in Sections 718.3.2 through 718.3.3.
Draftstopping shall be provided in floor/ceiling spaces in Group R-1 buildings, in Group R-2 buildings with three or more dwelling units, in Group R-3 buildings with two dwelling unitsand in Group R-4 buildings. Draftstopping shall be located above and in line with the dwelling unit and sleeping unitseparations.
Draftstopping is not required in buildings equipped throughout with an automatic sprinkler systemin accordance with Section 903.3.1.2, provided that automatic sprinklers are installed in the combustible concealed spaces where the draftstopping is being omitted.
In combustible construction, draftstopping shall be installed to subdivide atticspaces and concealed roof spaces in the locations prescribed in Sections 718.4.2 and 718.4.3. Ventilation of concealed roof spaces shall be maintained in accordance with Section 1203.2.
Draftstopping shall be provided in attics, mansards, overhangs or other concealed roof spaces of Group R-2 buildings with three or more dwelling unitsand in all Group R-1 buildings. Draftstopping shall be installed above, and in line with, sleeping unitand dwelling unit separation walls that do not extend to the underside of the roof sheathing above.
Draftstopping is not required in buildings equipped throughout with an automatic sprinkler systemin accordance with Section 903.3.1.2, provided that automatic sprinklers are installed in the combustible concealed space where the draftstopping is being omitted.
The minimum thickness of gypsum plaster or Portland cement plaster used in a fire-resistance-rated system shall be determined by the prescribed fire tests. The plaster thickness shall be measured from the face of the lath where applied to gypsum lath or metal lath.
For fire-resistance purposes, 1/2 inch (12.7 mm) of unsanded gypsum plaster shall be deemed equivalent to 3/4 inch (19.1 mm) of one-to-three gypsum sand plaster or 1 inch (25 mm) of Portland cement sand plaster.
In buildings of Type I and II construction, plaster shall be applied directly on concrete or masonry or on approvednoncombustible plastering base and furring.
Plaster protection more than 1 inch (25 mm) in thickness shall be reinforced with an additional layer of approvedlath embedded not less than 3/4 inch (19.1 mm) from the outer surface and fixed securely in place.
Exception:Solid plaster partitions or where otherwise determined by fire tests.
In reinforced concrete construction, gypsum plaster or Portland cement plaster is permitted to be substituted for 1/2 inch (12.7 mm) of the required poured concrete protection, except that a minimum thickness of 3/8 inch (9.5 mm) of poured concrete shall be provided in reinforced concrete floors and 1 inch (25 mm) in reinforced concrete columns in addition to the plaster finish. The concrete base shall be prepared in accordance with Section 2510.7.
Insulating materials, including facings such as vapor retarders and vapor-permeable membranes, similar coverings and all layers of single and multilayer reflective foil insulations, shall comply with the requirements of this section. Where a flame spread index or a smoke-developed index is specified in this section, such index shall be determined in accordance with ASTM E84 or UL 723. Any material that is subject to an increase in flame spread index or smoke-developed index beyond the limits herein established through the effects of age, moisture or other atmospheric conditions shall not be permitted.
Insulating materials, where concealed as installed in buildings of any type of construction, shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 450.
Exception:
Cellulosic fiber loose-fill insulation complying with the requirements of Section 720.6 shall not be required to meet a flame spread index requirement but shall be required to meet a smoke-developed index of not more than 450 when tested in accordance with CAN/ULC S102.2.
Where such materials are installed in concealed spaces in buildings of Type III, IV or V construction, the flame spread and smoke-developed limitations do not apply to facings, coverings, and layers of reflective foil insulation that are installed behind and in substantial contact with the unexposed surface of the ceiling, wall or floor finish.
Insulating materials, where exposed as installed in buildings of any type of construction, shall have a flame spread index of not more than 25 and a smoke-developed index of not more than 450.
Exception:
Cellulosic fiber loose-fill insulation complying with the requirements of Section 720.6 shall not be required to meet a flame spread index requirement but shall be required to meet a smoke-developed index of not more than 450 when tested in accordance with CAN/ULC S102.2.
Exposed insulation materials installed on atticfloors shall have a critical radiant flux of not less than 0.12 watt per square centimeter when tested in accordance with ASTM E970.
Loose-fill insulation materials that cannot be mounted in the ASTM E84 or UL 723 apparatus without a screen or artificial supports shall comply with the flame spread and smoke-developed limits of Sections 720.2 and 720.3 when tested in accordance with CAN/ULC S102.2.
Exception:
Cellulosic fiber loose-fill insulation shall not be required to meet a flame spread index requirement when tested in accordance with CAN/ULC S102.2, provided such insulation has a smoke-developed index of not more than 450 and complies with the requirements of Section 720.6.
The use of combustible roof insulation not complying with Sections 720.2 and 720.3 shall be permitted in any type of construction provided that insulation is covered with approvedroof coverings directly applied thereto.
Cellulosic fiber loose-fill insulation and self-supported spray-applied cellulosic insulation shall comply with CPSC 16 CFR Parts 1209 and 1404. Each package of such insulating material shall be clearly labeled in accordance with CPSC 16 CFR Parts 1209 and 1404.
The provisions of this section contain prescriptive details of fire-resistance-rated building elements, components or assemblies. The materials of construction listed in Tables 721.1(1), 721.1(2), and 721.1(3) shall be assumed to have the fire-resistance ratingsprescribed therein. Where materials that change the capacity for heat dissipation are incorporated into a fire-resistance-rated assembly, fire test results or other substantiating data shall be made available to the building officialto show that the required fire-resistance-rating time period is not reduced.
TABLE 721.1(1) MINIMUM PROTECTION OF STRUCTURAL PARTS BASED ON TIME PERIODS FOR VARIOUS NONCOMBUSTIBLE INSULATING MATERIALSm
STRUCTURAL PARTS TO BE PROTECTED
ITEM NUMBER
INSULATING MATERIAL USED
MINIMUM THICKNESS OF INSULATING MATERIAL FOR THE FOLLOWING FIRE-RESISTANCE PERIODS (inches)
4 hours
3 hours
2 hours
1 hour
1. Steel columns and all of primary trusses
1-1.1
Carbonate, lightweight and sand-lightweight aggregateconcrete, members 6" × 6" or greater (not including sandstone, granite and siliceous gravel).a
21/2
2
11/2
1
1-1.2
Carbonate, lightweight and sand-lightweight aggregateconcrete, members 8" × 8" or greater (not including sandstone, granite and siliceous gravel).a
2
11/2
1
1
1-1.3
Carbonate, lightweight and sand-lightweight aggregateconcrete, members 12" × 12" or greater (not including sandstone, granite and siliceous gravel).a
4" hollow clay tile in two 2" layers; 1/2" mortar between tile and column; 3/8" metal mesh 0.046" wire diameter in horizontal joints; tile fill.a
4
—
—
—
1-3.2
2" hollow clay tile; 3/4" mortar between tile and column; 3/8" metal mesh 0.046" wire diameter in horizontal joints; limestone concrete filla; plastered with 3/4" gypsum plaster.
3
—
—
—
1-3.3
2" hollow clay tile with outside wire ties 0.08" diameter at each course of tile or 3/8" metal mesh 0.046" diameter wire in horizontal joints; limestone or trap-rock concrete filla extending 1" outside column on all sides.
—
—
3
—
1-3.4
2" hollow clay tile with outside wire ties 0.08" diameter at each course of tile with or without concrete fill; 3/4" mortar between tile and column.
—
—
—
2
1-4.1
Cement plaster over metal lath wire tied to 3/4" cold-rolled vertical channels with 0.049" (No. 18 B.W. gage) wire ties spaced 3" to 6" on center. Plaster mixed 1:2 1/2 by volume, cement to sand.
—
—
21/2b
7/8
1-5.1
Vermiculiteconcrete, 1:4 mix by volume over paperbacked wire fabric lath wrapped directly around column with additional 2" × 2" 0.065" /0.065" (No. 16/16 B.W. gage) wire fabric placed 3/4" from outer concrete surface. Wire fabric tied with 0.049" (No. 18 B.W. gage) wire spaced 6" on center for inner layer and 2" on center for outer layer.
2
—
—
—
1-6.1
Perlite or vermiculitegypsum plaster over metal lath wrapped around column and furred 11/4" from column flanges. Sheets lapped at ends and tied at 6" intervals with 0.049" (No. 18 B.W. gage) tie wire. Plaster pushed through to flanges.
11/2
1
—
—
1-6.2
Perlite or vermiculitegypsum plaster over self-furring metal lath wrapped directly around column, lapped 1" and tied at 6" intervals with 0.049" (No. 18 B.W. gage) wire.
13/4
13/8
1
—
1-6.3
Perlite or vermiculitegypsum plaster on metal lath applied to 3/4" cold-rolled channels spaced 24" apart vertically and wrapped flatwise around column.
11/2
—
—
—
1-6.4
Perlite or vermiculitegypsum plaster over two layers of 1/2" plain full-length gypsum lath applied tight to column flanges. Lath wrapped with 1" hexagonal mesh of No. 20 gage wire and tied with doubled 0.035" diameter (No. 18 B.W. gage) wire ties spaced 23" on center. For three-coat work, the plaster mix for the second coat shall not exceed 100 pounds of gypsum to 21/2 cubic feet of aggregate for the 3-hour system.
21/2
2
—
—
1-6.5
Perlite or vermiculitegypsum plaster over one layer of 1/2" plain full-length gypsum lath applied tight to column flanges. Lath tied with doubled 0.049" (No. 18 B.W. gage) wire ties spaced 23" on center and scratch coat wrapped with 1" hexagonal mesh 0.035" (No. 20 B.W. gage) wire fabric. For three-coat work, the plaster mix for the second coat shall not exceed 100 pounds of gypsum to 21/2 cubic feet of aggregate.
—
2
—
—
1-7.1
Multiple layers of 1/2" gypsum wallboardc adhesivelyd secured to column flanges and successive layers. Wallboard applied without horizontal joints. Corner edges of each layer staggered. Wallboard layer below outer layer secured to column with doubled 0.049" (No. 18 B.W. gage) steel wire ties spaced 15" on center. Exposed corners taped and treated.
—
—
2
1
1-7.2
Three layers of 5/8" Type X gypsum wallboard.c First and second layer held in place by 1/8" diameter by 13/8" long ring shank nails with 5/16" diameter heads spaced 24" on center at corners. Middle layer also secured with metal straps at mid-height and 18" from each end, and by metal corner bead at each corner held by the metal straps. Third layer attached to corner bead with 1" long gypsum wallboard screws spaced 12" on center.
—
—
17/8
—
1-7.3
Three layers of 5/8" Type X gypsum wallboard,c each layer screw attached to 15/8" steel studs 0.018" thick (No. 25 carbon sheet steel gage) at each corner of column. Middle layer also secured with 0.049" (No. 18 B.W. gage) double-strand steel wire ties, 24" on center. Screws are No. 6 by 1" spaced 24" on center for inner layer, No. 6 by 15/8" spaced 12" on center for middle layer and No. 8 by 21/4" spaced 12" on center for outer layer.
—
17/8
—
—
1-8.1
Wood-fibered gypsum plaster mixed 1:1 by weight gypsum-to-sand aggregate applied over metal lath. Lath lapped 1" and tied 6" on center at all end, edges and spacers with 0.049" (No. 18 B.W. gage) steel tie wires. Lath applied over 1/2" spacers made of 3/4" furring channel with 2" legs bent around each corner. Spacers located 1" from top and bottom of member and a maximum of 40" on center and wire tied with a single strand of 0.049" (No. 18 B.W. gage) steel tie wires. Corner bead tied to the lath at 6" on center along each corner to provide plaster thickness.
—
—
15/8
—
1-9.1
Minimum W8x35 wide flange steel column (w/d ≥ 0.75) with each web cavity filled even with the flange tip with normal weight carbonate or siliceous aggregateconcrete (3,000 psi minimum compressive strength with 145 pcf ± 3 pcf unit weight). Reinforce the concrete in each web cavity with a minimum No. 4 deformed reinforcing bar installed vertically and centered in the cavity, and secured to the column web with a minimum No. 2 horizontal deformed reinforcing bar welded to the web every 18" on center vertically. As an alternative to the No. 4 rebar, 3/4" diameter by 3" long headed studs, spaced at 12" on center vertically, shall be welded on each side of the web midway between the column flanges.
—
—
—
See Note n
2. Webs or flanges of steel beams and girders
2-1.1
Carbonate, lightweight and sand-lightweight aggregateconcrete (not including sandstone, granite and siliceous gravel) with 3" or finer metal mesh placed 1" from the finished surface anchored to the top flange and providing not less than 0.025 square inch of steel area per foot in each direction.
2
11/2
1
1
2-1.2
Siliceous aggregateconcrete and concrete excluded in Item 2-1.1 with 3" or finer metal mesh placed 1" from the finished surface anchored to the top flange and providing not less than 0.025 square inch of steel area per foot in each direction.
21/2
2
11/2
1
2-2.1
Cement plaster on metal lath attached to 3/4" cold-rolled channels with 0.04" (No. 18 B.W. gage) wire ties spaced 3" to 6" on center. Plaster mixed 1:2 1/2 by volume, cement to sand.
—
—
21/2b
7/8
2-3.1
Vermiculitegypsum plaster on a metal lath cage, wire tied to 0.165" diameter (No. 8 B.W. gage) steel wire hangers wrapped around beam and spaced 16" on center. Metal lath ties spaced approximately 5" on center at cage sides and bottom.
—
7/8
—
—
2-4.1
Two layers of 5/8" Type X gypsum wallboardc are attached to U-shaped brackets spaced 24" on center. 0.018" thick (No. 25 carbon sheet steel gage) 15/8" deep by 1" galvanized steel runner channels are first installed parallel to and on each side of the top beam flange to provide a 1/2" clearance to the flange. The channel runners are attached to steel deck or concrete floor construction with approved fasteners spaced 12" on center. U-shaped brackets are formed from members identical to the channel runners. At the bent portion of the U-shaped bracket, the flanges of the channel are cut out so that 15/8" deep corner channels can be inserted without attachment parallel to each side of the lower flange. As an alternative, 0.021" thick (No. 24 carbon sheet steel gage) 1" × 2" runner and corner angles shall be used in lieu of channels, and the web cutouts in the U-shaped brackets shall not be required. Each angle is attached to the bracket with 1/2"-long No. 8 self-drilling screws. The vertical legs of the U-shaped bracket are attached to the runners with one 1/2" long No. 8 self-drilling screw. The completed steel framing provides a 21/8" and 11/2" space between the inner layer of wallboard and the sides and bottom of the steel beam, respectively. The inner layer of wallboard is attached to the top runners and bottom corner channels or corner angles with 11/4"-long No. 6 self-drilling screws spaced 16" on center. The outer layer of wallboard is applied with 13/4"-long No. 6 self-drilling screws spaced 8" on center. The bottom corners are reinforced with metal corner beads.
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—
11/4
—
2-4.2
Three layers of 5/8" Type X gypsum wallboardc attached to a steel suspension system as described immediately above utilizing the 0.018" thick (No. 25 carbon sheet steel gage) 1" × 2" lower corner angles. The framing is located so that a 21/8" and 2" space is provided between the inner layer of wallboard and the sides and bottom of the beam, respectively. The first two layers of wallboard are attached as described immediately above. A layer of 0.035" thick (No. 20 B.W. gage) 1" hexagonal galvanized wire mesh is applied under the soffit of the middle layer and up the sides approximately 2". The mesh is held in position with the No. 6 15/8"-long screws installed in the vertical leg of the bottom corner angles. The outer layer of wallboard is attached with No. 6 21/4"-long screws spaced 8" on center. One screw is also installed at the mid-depth of the bracket in each layer. Bottom corners are finished as described above.
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17/8
—
—
3. Bonded pretensioned reinforcement in prestressed concretee
5. Reinforcing steel in reinforced concrete columns, beams girders and trusses
5-1.1
Carbonate, lightweight and sand-lightweight aggregateconcrete, members 12" or larger, square or round. (Size limit does not apply to beams and girders monolithic with floors.)
11/2
11/2
11/2
11/2
Siliceous aggregateconcrete, members 12" or larger, square or round. (Size limit does not apply to beams and girders monolithic with floors.)
2
11/2
11/2
11/2
6. Reinforcing steel in reinforced concrete joistsl
For SI: 1 inch = 25.4 mm, 1 square inch = 645.2 mm2, 1 cubic foot = 0.0283 m3, 1 pound per cubic foot = 16.02 kg/m3.
Reentrant parts of protected members to be filled solidly.
Two layers of equal thickness with a 3/4-inch airspace between.
For all of the construction with gypsum wallboard described in Table 721.1(1), gypsum base for veneer plaster of the same size, thickness and core type shall be permitted to be substituted for gypsum wallboard, provided attachment is identical to that specified for the wallboard and the joints on the face layer are reinforced, and the entire surface is covered with not less than 1/16-inch gypsum veneer plaster.
An approved adhesive qualified under ASTM E119 or UL 263.
Where lightweight or sand-lightweightconcrete having an oven-dry weight of 110 pounds per cubic foot or less is used, the tabulated minimum cover shall be permitted to be reduced 25 percent, except that in no case shall the cover be less than 3/4 inch in slabs or 11/2 inches in beams or girders.
Adequate provisions against spalling shall be provided by U-shaped or hooped stirrups spaced not to exceed the depth of the member with a clear cover of 1 inch.
Prestressed slabs shall have a thickness not less than that required in Table 721.1(3) for the respective fire-resistance time period.
Fire coverage and end anchorages shall be as follows: Cover to the prestressing steel at the anchor shall be 1/2 inch greater than that required away from the anchor. Minimum cover to steel-bearing plate shall be 1 inch in beams and 3/4 inch in slabs.
For beam widths between 8 inches and 12 inches, cover thickness shall be permitted to be determined by interpolation.
Interior spans of continuous slabs, beams and girders shall be permitted to be considered restrained.
For use with concrete slabs having a comparable fire endurance where members are framed into the structure in such a manner as to provide equivalent performance to that of monolithic concrete construction.
Generic fire-resistance ratings(those not designated as PROPRIETARY* in the listing) in GA 600 shall be accepted as if herein listed.
No additional insulating material is required on the exposed outside face of the column flange to achieve a 1-hour fire-resistance rating.
TABLE 721.1(2) RATED FIRE-RESISTANCE PERIODS FOR VARIOUS WALLS AND PARTITIONS a, o, p
4" nominal thick units not less than 75 percent solid backed with a hat-shaped metal furring channel 3/4" thick formed from 0.021" sheet metal attached to the brickwall on 24" centers with approved fasteners, and 1/2" Type X gypsum wallboard attached to the metal furring strips with 1"-long Type S screws spaced 8" on center.
—
—
5d
—
2. Combination of clay brick and load-bearing hollow clay tile
5. Glazed or unglazed facing tile, nonload-bearing
5-1.1
One 2" unit cored 15 percent maximum and one 4" unit cored 25 percent maximum with 3/4" mortar-filled collar joint. Unit positions reversed in alternate courses.
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63/8
—
—
5-1.2
One 2" unit cored 15 percent maximum and one 4" unit cored 40 percent maximum with 3/4" mortar-filled collar joint. Unit positions side with 3/4" gypsum plaster. Two wythes tied together every fourth course with No. 22 gage corrugated metal ties.
—
63/4
—
—
5-1.3
One unit with three cells in wall thickness, cored 29 percent maximum.
—
—
6
—
5-1.4
One 2" unit cored 22 percent maximum and one 4" unit cored 41 percent maximum with 1/4" mortar-filled collar joint. Two wythes tied together every third course with 0.030" (No. 22 galvanized sheet steel gage) corrugated metal ties.
—
—
6
—
5-1.5
One 4" unit cored 25 percent maximum with 3/4" gypsum plaster on one side.
—
—
43/4
—
5-1.6
One 4" unit with two cells in wall thickness, cored 22 percent maximum.
3/4" by 0.055" (No. 16 carbon sheet steel gage) vertical cold-rolled channels, 16" on center with 2.6-pound flat metal lath applied to one face and tied with 0.049" (No. 18 B.W. gage) wire at 6" spacing. Gypsum plaster each side mixed 1:2 by weight, gypsum to sand aggregate.
—
—
—
2d
6-1.2
3/4" by 0.05" (No. 16 carbon sheet steel gage) cold-rolled channels 16" on center with metal lath applied to one face and tied with 0.049" (No. 18 B.W. gage) wire at 6" spacing. Perlite or vermiculitegypsum plaster each side. For three-coat work, the plaster mix for the second coat shall not exceed 100 pounds of gypsum to 21/2 cubic feet of aggregate for the 1-hour system.
—
—
21/2d
2d
6-1.3
3/4" by 0.055" (No. 16 carbon sheet steel gage) vertical cold-rolled channels, 16" on center with 3/8" gypsum lath applied to one face and attached with sheet metal clips. Gypsum plaster each side mixed 1:2 by weight, gypsum to sand aggregate.
—
—
—
2d
6-2.1
Studless with 1/2" full-length plain gypsum lath and gypsum plaster each side. Plaster mixed 1:1 for scratch coat and 1:2 for brown coat, by weight, gypsum to sand aggregate.
Studless partition with 3/8" rib metal lath installed vertically adjacent edges tied 6" on center with No. 18 gage wire ties, gypsum plaster each side mixed 1:2 by weight, gypsum to sand aggregate.
Perlite mixed in the ratio of 3 cubic feet to 100 pounds of Portland cement and machine applied to stud side of 11/2" mesh by 0.058-inch (No. 17 B.W. gage) paper-backed woven wire fabric lath wire-tied to 4"-deep steel trussed wirej studs 16" on center. Wire ties of 0.049" (No. 18 B.W. gage) galvanized steel wire 6" on center vertically.
3/4" by 0.055-inch (No. 16 carbon sheet steel gage) cold-rolled channels, 12" on center with 2.5-pound flat metal lath applied to one face and tied with 0.049" (No. 18 B.W. gage) wire at 6" spacing. Neat gypsum plaster applied each side.
One full-length layer 1/2" Type X gypsum wallboarde laminated to each side of 1" full-length V-edge gypsum coreboard with approved laminating compound. Vertical joints of face layer and coreboard staggered not less than 3".
One full-length layer of 5/8" Type X gypsum wallboarde attached to both sides of wood or metal top and bottom runners laminated to each side of 1" × 6" full-length gypsum coreboard ribs spaced 2" on center with approved laminating compound. Ribs centered at vertical joints of face plies and joints staggered 24" in opposing faces. Ribs may be recessed 6" from the top and bottom.
UpCodes note:
IBC Table 721.1(2), Item 10-1.1 includes text that reads "gypsum coreboard ribs spaced 2" on center." We believe the text should read "gypsum coreboard ribs spaced 24" on center" as 2" on center does not reflect the intent for the wall assembly. Please contact your local building department for more information.
—
—
—
21/4d
10-1.2
1" regular gypsum V-edge full-length backing board attached to both sides of wood or metal top and bottom runners with nails or 15/8" drywall screws at 24" on center. Minimum width of runners 15/8". Face layer of 1/2" regular full-length gypsum wallboard laminated to outer faces of backing board with approved laminating compound.
—
—
45/8d
—
11. Noncombustible studs-interior partition with plaster each side
11-1.1
31/4" × 0.044" (No. 18 carbon sheet steel gage) steel studs spaced 24" on center. 5/8" gypsum plaster on metal lath each side mixed 1:2 by weight, gypsum to sand aggregate.
—
—
—
43/4d
11-1.2
33/8" × 0.055" (No. 16 carbon sheet steel gage) approved nailablek studs spaced 24" on center. 5/8" neat gypsum wood-fibered plaster each side over 3/8" rib metal lath nailed to studs with 6d common nails, 8" on center. Nails driven 11/4" and bent over.
—
—
55/8
—
11-1.3
4" × 0.044" (No. 18 carbon sheet steel gage) channel-shaped steel studs at 16" on center. On each side approved resilient clips pressed onto stud flange at 16" vertical spacing, 1/4" pencil rods snapped into or wire tied onto outer loop of clips, metal lath wire-tied to pencil rods at 6" intervals, 1" perlitegypsum plaster, each side.
—
75/8d
—
—
11-1.4
21/2" × 0.044" (No. 18 carbon sheet steel gage) steel studs spaced 16" on center. Wood fibered gypsum plaster mixed 1:1 by weight gypsum to sand aggregate applied on 3/4-pound metal lath wire tied to studs, each side. 3/4" plaster applied over each face, including finish coat.
—
—
41/4d
—
12. Wood studs-interior partition with plaster each side
12-1.1l, m
2" × 4" wood studs 16" on center with 5/8" gypsum plaster on metal lath. Lath attached by 4d common nails bent over or No. 14 gage by 11/4" by 3/4" crown width staples spaced 6" on center. Plaster mixed 1:11/2 for scratch coat and 1:3 for brown coat, by weight, gypsum to sand aggregate.
—
—
—
51/8
12-1.2l
2" × 4" wood studs 16" on center with metal lath and 7/8" neat wood-fibered gypsum plaster each side. Lath attached by 6d common nails, 7" on center. Nails driven 11/4" and bent over.
—
—
51/2d
—
12-1.3l
2" × 4" wood studs 16" on center with 3/8" perforated or plain gypsum lath and 1/2" gypsum plaster each side. Lath nailed with 11/8" by No. 13 gage by 19/64" head plasterboard blued nails, 4" on center. Plaster mixed 1:2 by weight, gypsum to sand aggregate.
—
—
—
51/4
12-1.4l
2" × 4" wood studs 16" on center with 3/8" Type X gypsum lath and 1/2" gypsum plaster each side. Lath nailed with 11/8" by No. 13 gage by 19/64" head plasterboard blued nails, 5" on center. Plaster mixed 1:2 by weight, gypsum to sand aggregate.
—
—
—
51/4
13. Noncombustible studs-interior partition with gypsum wallboard each side
13-1.1
0.018" (No. 25 carbon sheet steel gage) channel-shaped studs 24" on center with one full-length layer of 5/8" Type X gypsum wallboarde applied vertically attached with 1"-long No. 6 drywall screws to each stud. Screws are 8" on center around the perimeter and 12" on center on the intermediate stud. Where applied horizontally, the Type X gypsum wallboard shall be attached to 35/8" studs and the horizontal joints shall be staggered with those on the opposite side. Screws for the horizontal application shall be 8" on center at vertical edges and 12" on center at intermediate studs.
—
—
—
27/8d
13-1.2
0.018" (No. 25 carbon sheet steel gage) channel-shaped studs 25" on center with two full-length layers of 1/2" Type X gypsum wallboarde applied vertically each side. First layer attached with 1"-long, No. 6 drywall screws, 8" on center around the perimeter and 12" on center on the intermediate stud. Second layer applied with vertical joints offset one stud space from first layer using 15/8" long, No. 6 drywall screws spaced 9" on center along vertical joints, 12" on center at intermediate studs and 24" on center along top and bottom runners.
—
—
35/8d
—
13-1.3
0.055" (No. 16 carbon sheet steel gage) approved nailable metal studse 24" on center with full-length 5/8" Type X gypsum wallboarde applied vertically and nailed 7" on center with 6d cement-coated common nails. Approved metal fastener grips used with nails at vertical butt joints along studs.
—
—
—
47/8
14. Wood studs-interior partition with gypsum wallboard each side
14-1.1h, m
2" × 4" wood studs 16" on center with two layers of 3/8" regular gypsum wallboarde each side, 4d coolern or wallboardn nails at 8" on center first layer, 5d coolern or wallboardn nails at 8" on center second layer with laminating compound between layers, joints staggered. First layer applied full length vertically, second layer applied horizontally or vertically.
—
—
—
5
14-1.2l, m
2" × 4" wood studs 16" on center with two layers 1/2" regular gypsum wallboarde applied vertically or horizontally each sidek, joints staggered. Nail base layer with 5d coolern or wallboardn nails at 8" on center face layer with 8d coolern or wallboardn nails at 8" on center.
—
—
—
51/2
14-1.3l, m
2" × 4" wood studs 24" on center with 5/8" Type X gypsum wallboarde applied vertically or horizontally nailed with 6d coolern or wallboardn nails at 7" on center with end joints on nailing members. Stagger joints each side.
—
—
—
43/4
14-1.4l
2" × 4" fire-retardant-treated wood studs spaced 24" on center with one layer of 5/8" Type X gypsum wallboarde applied with face paper grain (long dimension) parallel to studs. Wallboard attached with 6d coolern or wallboardn nails at 7" on center.
—
—
—
43/4d
14-1.5l, m
2" × 4" wood studs 16" on center with two layers 5/8" Type X gypsum wallboarde each side. Base layers applied vertically and nailed with 6d coolern or wallboardn nails at 9" on center. Face layer applied vertically or horizontally and nailed with 8d coolern or wallboardn nails at 7" on center. For nail-adhesive application, base layers are nailed 6" on center. Face layers applied with coating of approved wallboard adhesive and nailed 12" on center.
—
—
6
—
14-1.6l
2" × 3" fire-retardant-treated wood studs spaced 24" on center with one layer of 5/8" Type X gypsum wallboarde applied with face paper grain (long dimension) at right angles to studs. Wallboard attached with 6d cement-coated box nails spaced 7" on center.
Exterior surface with 3/4" drop siding over 1/2" gypsum sheathing on 2" × 4" wood studs at 16" on center, interior surface treatment as required for 1-hour-rated exterior or interior 2" × 4" wood stud partitions. Gypsum sheathing nailed with 13/4" by No. 11 gage by 7/16" head galvanized nails at 8" on center. Siding nailed with 7d galvanized smooth box nails.
—
—
—
Varies
15-1.2l, m
2" × 4" wood studs 16" on center with metal lath and 3/4" cement plaster on each side. Lath attached with 6d common nails 7" on center driven to 1" minimum penetration and bent over. Plaster mix 1:4 for scratch coat and 1:5 for brown coat, by volume, cement to sand.
—
—
—
53/8
15-1.3l, m
2" × 4" wood studs 16" on center with 7/8" cement plaster (measured from the face of studs) on the exterior surface with interior surface treatment as required for interior wood stud partitions in this table. Plaster mix 1:4 for scratch coat and 1:5 for brown coat, by volume, cement to sand.
—
—
—
Varies
15-1.4
35/8" No. 16 gage noncombustible studs 16" on center with 7/8" cement plaster (measured from the face of the studs) on the exterior surface with interior surface treatment as required for interior, nonbearing, noncombustible stud partitions in this table. Plaster mix 1:4 for scratch coat and 1:5 for brown coat, by volume, cement to sand.
—
—
—
Variesd
15-1.5m
21/4" × 33/4" clay face brick with cored holes over 1/2" gypsum sheathing on exterior surface of 2" × 4" wood studs at 16" on center and two layers 5/8" Type X gypsum wallboarde on interior surface. Sheathing placed horizontally or vertically with vertical joints over studs nailed 6" on center with 13/4" × No. 11 gage by 7/16" head galvanized nails. Inner layer of wallboard placed horizontally or vertically and nailed 8" on center with 6d coolern or wallboardn nails. Outer layer of wallboard placed horizontally or vertically and nailed 8" on center with 8d coolern or wallboardn nails. Joints staggered with vertical joints over studs. Outer layer joints taped and finished with compound. Nail heads covered with joint compound. 0.035 inch (No. 20 galvanized sheet gage) corrugated galvanized steel wall ties3/4" by 65/8" attached to each stud with two 8d coolern or wallboardn nails every sixth course of bricks.
—
—
10
—
15-1.6l, m
2" × 6" fire-retardant-treated wood studs 16" on center. Interior face has two layers of 5/8" Type X gypsum with the base layer placed vertically and attached with 6d box nails 12" on center. The face layer is placed horizontally and attached with 8d box nails 8" on center at joints and 12" on center elsewhere. The exterior face has a base layer of 5/8" Type X gypsum sheathing placed vertically with 6d box nails 8" on center at joints and 12" on center elsewhere. An approved building paper is next applied, followed by self-furred exterior lath attached with 21/2", No. 12 gage galvanized roofing nails with a 3/8" diameter head and spaced 6" on center along each stud. Cement plaster consisting of a 1/2" brown coat is then applied. The scratch coat is mixed in the proportion of 1:3 by weight, cement to sand with 10 pounds of hydrated lime and 3 pounds of approved additives or admixtures per sack of cement. The brown coat is mixed in the proportion of 1:4 by weight, cement to sand with the same amounts of hydrated lime and approved additives or admixtures used in the scratch coat.
—
—
81/4
—
15-1.7l, m
2" × 6" wood studs 16" on center. The exterior face has a layer of 5/8" Type X gypsum sheathing placed vertically with 6d box nails 8" on center at joints and 12" on center elsewhere. An approved building paper is next applied, followed by 1" by No. 18 gage self-furred exterior lath attached with 8d by 21/2" long galvanized roofing nails spaced 6" on center along each stud. Cement plaster consisting of a 1/2" scratch coat, a bonding agent and a 1/2" brown coat and a finish coat is then applied. The scratch coat is mixed in the proportion of 1:3 by weight, cement to sand with 10 pounds of hydrated lime and 3 pounds of approved additives or admixtures per sack of cement. The brown coat is mixed in the proportion of 1:4 by weight, cement to sand with the same amounts of hydrated lime and approved additives or admixtures used in the scratch coat. The interior is covered with 3/8" gypsum lath with 1" hexagonal mesh of 0.035 inch (No. 20 B.W. gage) woven wire lath furred out 5/16" and 1" perlite or vermiculitegypsum plaster. Lath nailed with 11/8" by No. 13 gage by 19/64" head plasterboard glued nails spaced 5" on center. Mesh attached by 13/4" by No. 12 gage by 3/8" head nails with 3/8" furrings, spaced 8" on center. The plaster mix shall not exceed 100 pounds of gypsum to 21/2 cubic feet of aggregate.
—
—
83/8
—
15-1.8l, m
2" × 6" wood studs 16" on center. The exterior face has a layer of 5/8" Type X gypsum sheathing placed vertically with 6d box nails 8" on center at joints and 12" on center elsewhere. An approved building paper is next applied, followed by 11/2" by No. 17 gage self-furred exterior lath attached with 8d by 21/2" long galvanized roofing nails spaced 6" on center along each stud. Cement plaster consisting of a 1/2" scratch coat, and a 1/2" brown coat is then applied. The plaster may be placed by machine. The scratch coat is mixed in the proportion of 1:4 by weight, plastic cement to sand. The brown coat is mixed in the proportion of 1:5 by weight, plastic cement to sand. The interior is covered with 3/8" gypsum lath with 1" hexagonal mesh of No. 20 gage woven wire lath furred out 5/16" and 1" perlite or vermiculitegypsum plaster. Lath nailed with 11/8" by No. 13 gage by 19/64" head plasterboard glued nails spaced 5" on center. Mesh attached by 13/4" by No. 12 gage by 3/8" head nails with 3/8" furrings, spaced 8" on center. The plaster mix shall not exceed 100 pounds of gypsum to 21/2 cubic feet of aggregate.
—
—
83/8
—
15-1.9
4" No. 18 gage, nonload-bearing metal studs, 16" on center, with 1" Portland cement lime plaster (measured from the back side of the 3/4-pound expanded metal lath) on the exterior surface. Interior surface to be covered with 1" of gypsum plaster on 3/4-pound expanded metal lath proportioned by weight-1:2 for scratch coat, 1:3 for brown, gypsum to sand. Lath on one side of the partition fastened to 1/4" diameter pencil rods supported by No. 20 gage metal clips, located 16" on center vertically, on each stud. 3" thick mineral fiber insulating batts friction fitted between the studs.
—
—
61/2d
—
15-1.10
Steel studs 0.060" thick, 4" deep or 6" at 16" or 24" centers, with 1/2" Glass Fiber Reinforced Concrete (GFRC) on the exterior surface. GFRC is attached with flex anchors at 24" on center, with 5" leg welded to studs with two 1/2"-long flare-bevel welds, and 4" foot attached to the GFRC skin with 5/8" thick GFRC bonding pads that extend 21/2" beyond the flex anchor foot on both sides. Interior surface to have two layers of 1/2" Type X gypsum wallboard.e The first layer of wallboard to be attached with 1"-long Type S buglehead screws spaced 24" on center and the second layer is attached with 15/8"-long Type S screws spaced at 12" on center. Cavity is to be filled with 5" of 4 pcf (nominal) mineral fiber batts. GFRC has 11/2" returns packed with mineral fiber and caulked on the exterior.
—
—
61/2
—
15-1.11
Steel studs 0.060" thick, 4" deep or 6" at 16" or 24" centers, respectively, with 1/2" Glass Fiber Reinforced Concrete (GFRC) on the exterior surface. GFRC is attached with flex anchors at 24" on center, with 5" leg welded to studs with two 1/2"-long flare-bevel welds, and 4" foot attached to the GFRC skin with 5/8" -thick GFRC bonding pads that extend 21/2" beyond the flex anchor foot on both sides. Interior surface to have one layer of 5/8" Type X gypsum wallboarde, attached with 11/4"-long Type S buglehead screws spaced 12" on center. Cavity is to be filled with 5" of 4 pcf (nominal) mineral fiber batts. GFRC has 11/2" returns packed with mineral fiber and caulked on the exterior.
—
—
—
61/8
15-1.12q
2" × 6" wood studs at 16" with double top plates, single bottom plate; interior and exterior sides covered with 5/8" Type X gypsum wallboard, 4' wide, applied horizontally or vertically with vertical joints over studs, and fastened with 21/4" Type S drywall screws, spaced 12" on center. Cavity to be filled with 51/2" mineral wool insulation.
—
—
—
63/4
15-1.13q
2" × 6" wood studs at 16" with double top plates, single bottom plate; interior and exterior sides covered with 5/8" Type X gypsum wallboard, 4' wide, applied vertically with all joints over framing or blocking and fastened with 21/4" Type S drywall screws, spaced 12" on center. R-19 mineral fiber insulation installed in stud cavity.
—
—
—
63/4
15-1.14q
2" × 6" wood studs at 16" with double top plates, single bottom plate; interior and exterior sides covered with 5/8" Type X gypsum wallboard, 4' wide, applied horizontally or vertically with vertical joints over studs, and fastened with 21/4" Type S drywall screws, spaced 7" on center.
—
—
—
63/4
15-1.15q
2" × 4" wood studs at 16" with double top plates, single bottom plate; interior and exterior sides covered with 5/8" Type X gypsum wallboard and sheathing, respectively, 4' wide, applied horizontally or vertically with vertical joints over studs, and fastened with 21/4" Type S drywall screws, spaced 12" on center. Cavity to be filled with 31/2" mineral wool insulation.
—
—
—
43/4
15-1.16q
2" × 6" wood studs at 24" centers with double top plates, single bottom plate; interior and exterior side covered with two layers of 5/8" Type X gypsum wallboard, 4' wide, applied horizontally with vertical joints over studs. Base layer fastened with 21/4" Type S drywall screws, spaced 24" on center and face layer fastened with Type S drywall screws, spaced 8" on center, wallboard joints covered with paper tape and joint compound, fastener heads covered with
(Equation 7-1)
(Equation 7-2)