Buildings and structures, and parts thereof, shall be constructed to safely support all loads, including dead loads, live loads, roof loads, flood loads, snow loads, wind loads and seismic loads as prescribed by this code. The construction of buildings and structures in accordance with the provisions of this code shall result in a system that provides a complete load path that meets the requirements for the transfer of loads from their point of origin through the load-resisting elements to the foundation. Buildings and structures constructed as prescribed by this code are deemed to comply with the requirements of this section.
Exception: Buildings and structures located within the High Velocity Hurricane Zone shall comply with Sections R302 to R328, inclusive and the provisions of Chapter 44, Sections R301.2.5 and R406. In addition, buildings and structures located in flood hazard areas established in Table R301.2(1) shall comply with Sections R301.2.4, R301.2.5 and R322.
Buildings shall be constructed in accordance with the provisions of this code as limited by the provisions of this section. Additional criteria shall be set forth in Table R301.2(1).
CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA
|WIND DESIGN||SEISMIC |
|SUBJECT TO DAMAGE FROM||WINTER |
|ICE BARRIER REQUIREDh||FLOOD |
|Special wind |
|Weatheringa||Frost line |
|NA||See Fig. R301.2(4)||NA||Negligible||NA||Very Heavy||NA||NA||NA|
For SI: 1 pound per square foot = 0.0479 kPa, 1 mile per hour = 0.447 m/s.
|ULTIMATE DESIGN WIND SPEED, VULT (mph)|
|Gable Roof 0 to 7 degrees||1, 1'g||10||10.0||-22.7||10.0||-24.8||10.0||-29.1||10.0||-33.7||10.0||-38.7||11.2||-44.0||12.7||-49.7||14.2||-55.7|
|Gable Roof > 7 to 20 degrees||1, 2e||10||10.6||-26.4||11.6||-28.7||13.6||-33.7||15.8||-39.1||18.1||-44.9||20.6||-51.0||23.3||-57.6||26.1||-64.6|
|2n, 2r, 3e||10||10.6||-38.5||11.6||-41.9||13.6||-49.2||15.8||-57.0||18.1||-65.4||20.6||-74.5||23.3||-84.1||26.1||-94.2|
|2n, 2r, 3e||20||10.0||-33.2||10.0||-36.2||11.7||-42.4||13.6||-49.2||15.6||-56.5||17.8||-64.3||20.1||-72.6||22.5||-81.4|
|2n, 2r, 3e||50||10.0||-26.2||10.0||-28.5||10.0||-33.5||10.8||-38.8||12.3||-44.6||14.0||-50.7||15.9||-57.2||17.8||-64.2|
|2n, 2r, 3e||100||10.0||-20.9||10.0||-22.8||10.0||-26.7||10.0||-31.0||10.0||-35.6||11.2||-40.5||12.7||-45.7||14.2||-51.3|
|Gable Roof > 20 to 27 degrees||1, 2e||10||10.6||-20.3||11.6||-22.1||13.6||-26.0||15.8||-30.1||18.1||-34.6||20.6||-39.3||23.3||-44.4||26.1||-49.8|
|2n, 2r, 3e||10||10.6||-32.4||11.6||-35.3||13.6||-41.4||15.8||-48.0||18.1||-55.2||20.6||-62.8||23.3||-70.8||26.1||-79.4|
|2n, 2r, 3e||20||10.0||-28.4||10.0||-31.0||11.7||-36.3||13.6||-42.1||15.6||-48.4||17.8||-55.0||20.1||-62.1||22.5||-69.6|
|2n, 2r, 3e||50||10.0||-23.1||10.0||-25.2||10.0||-29.5||10.8||-34.2||12.3||-39.3||14.0||-44.7||15.9||-50.5||17.8||-56.6|
|2n, 2r, 3e||100||10.0||-19.1||10.0||-20.8||10.0||-24.4||10.0||-28.3||10.0||-32.5||11.2||-37.0||12.7||-41.8||14.2||-46.8|
|Gable Roof > 27 to 45 degrees||1, 2e, 2r||10||13.1||-24.0||14.2||-26.1||16.7||-30.6||19.4||-35.5||22.2||-40.8||25.3||-46.4||28.5||-52.3||32.0||-58.7|
|1, 2e, 2r||20||11.6||-20.3||12.6||-22.1||14.8||-26.0||17.2||-30.1||19.8||-34.6||22.5||-39.3||25.4||-44.4||28.5||-49.8|
|1, 2e, 2r||50||10.0||-15.5||10.5||-16.9||12.4||-19.8||14.3||-22.9||16.5||-26.3||18.7||-30.0||21.1||-33.8||23.7||-37.9|
|1, 2e, 2r||100||10.0||-11.9||10.0||-12.9||10.5||-15.1||12.2||-17.6||14.0||-20.2||15.9||-22.9||18.0||-25.9||20.2||-29.0|
|Hip Roof 7 to 20 degreesh||1||10||10.6||-24.0||11.6||-26.1||13.6||-30.6||15.8||-35.5||18.1||-40.8||20.6||-46.4||23.3||-52.3||26.1||-58.7|
|Hip Roof > 20 to 27 degrees||1||10||10.6||-19.1||11.6||-20.8||13.6||-24.4||15.8||-28.3||18.1||-32.5||20.6||-37.0||23.3||-41.8||26.1||-46.8|
|2e, 2r, 3||10||10.6||-26.4||11.6||-28.7||13.6||-33.7||15.8||-39.1||18.1||-44.9||20.6||-51.0||23.3||-57.6||26.1||-64.6|
|2e, 2r, 3||20||10.0||-23.6||10.0||-25.7||11.7||-30.1||13.6||-34.9||15.6||-40.1||17.8||-45.6||20.1||-51.5||22.5||-57.8|
|2e, 2r, 3||50||10.0||-19.9||10.0||-21.6||10.0||-25.4||10.8||-29.4||12.3||-33.8||14.0||-38.4||15.9||-43.4||17.8||-48.6|
|2e, 2r, 3||100||10.0||-17.1||10.0||-18.6||10.0||-21.8||10.0||-25.3||10.0||-29.0||11.2||-33.0||12.7||-37.3||14.2||-41.8|
|Hip Roof > 27 to 45 degrees||1||10||10.2||-20.3||11.1||-22.1||13.0||-26.0||15.1||-30.1||17.3||-34.6||19.7||-39.3||22.2||-44.4||24.9||-49.8|
For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2, 1 mile per hour = 0.447 m/s, 1 pound per square foot = 0.0479 kPa.
HEIGHT AND EXPOSURE ADJUSTMENT COEFFICIENTS FOR TABLE R301.2(2)
|MEAN ROOF HEIGHT |
NOMINAL (ASD) GARAGE DOOR WIND LOADS FOR A BUILDING WITH A MEAN ROOF HEIGHT OF 30 FEET LOCATED IN EXPOSURE B (PSF) 1, 2, 3, 4, 5
|Door Size||ULTIMATE DESIGN WIND SPEED (Vult) DETERMINED IN ACCORDANCE WITH SECTION R301.2.1 (MPH—3 SECOND GUST)|
|100 mph||110 mph||120 mph||130 mph||140 mph||150 mph||160 mph||170 mph||180 mph||190 mph||200 mph|
|78 mph||85 mph||93 mph||101 mph||108 mph||116 mph||124 mph||132 mph||139 mph||147 mph||155 mph|
|Nominal Design Wind Speed (Vasd) converted from Vult per Section R301.2.1.3|
For SI: 1 foot = 304.8 mm, 1 mile per hour = 1.609 km/h, 1 psf = 47.88 N/m2.
In regions where the ultimate design wind speed, Vult, from Figure R301.2(4) equals or exceeds 115 miles per hour (51 m/s), the design of concrete, masonry, wood and steel buildings for wind loads shall be in accordance with one or more of the following methods:
The elements of design not addressed by the methods in Items 1 through 6 shall be in accordance with the provisions of this code.
Sunrooms shall comply with AAMA/NSA 2100. For the purpose of applying the criteria of AAMA/NSA 2100 based on the intended use, sunrooms shall be identified as one of the following categories by the permit applicant, design professional or the property owner or owner's agent in the construction documents. Component and cladding pressures shall be used for the design of elements that do not qualify as main windforce-resisting systems. Main windforce-resisting system pressures shall be used for the design of elements assigned to provide support and stability for the overall sunroom.
- A thermally isolated sunroom with walls that are open or enclosed with insect screening or 0.5 mm (20 mil) maximum thickness plastic film. The space is nonhabitable and unconditioned.
- A thermally isolated sunroom with enclosed walls. The openings are enclosed with translucent or transparent plastic or glass. The space is nonhabitable and unconditioned.
- A thermally isolated sunroom with enclosed walls. The openings are enclosed with translucent or transparent plastic or glass. The sunroom fenestration complies with additional requirements for air infiltration resistance and water penetration resistance. The space is nonhabitable and unconditioned.
- A thermally isolated sunroom with enclosed walls. The sunroom is designed to be heated or cooled by a separate temperature control or system and is thermally isolated from the primary structure. The sunroom fenestration complies with additional requirements for water penetration resistance, air infiltration resistance and thermal performance. The space is nonhabitable and conditioned.
- A sunroom with enclosed walls. The sunroom is designed to be heated or cooled and is open to the main structure. The sunroom fenestration complies with additional requirements for water penetration resistance, air infiltration resistance and thermal performance. The space is habitable and conditioned.
Exterior glazed openings in buildings located in windborne debris regions shall be protected from windborne debris. Glazed opening protection for windborne debris shall meet the requirements of the Large Missile Test of ASTM E1996 and ASTM E1886 as modified in Section 301.2.1.2.1, TAS 201, 202 and 203, or AAMA 506, as applicable. Garage door glazed opening protection for windborne debris shall meet the requirements of an approved impact-resisting standard or ANSI/DASMA 115.
Exception: Wood structural panels with a thickness of not less than 7/16 inch (11 mm) and a span between lines of fasteners of 44 inches (1118 mm) shall be permitted for opening protection in buildings with a mean roof height of 33 feet or less in locations where Vult is 180 mph or less. Panels shall be precut to overlap the wall such that they extend a minimum of 2 inches (50.8 mm) beyond the lines of fasteners and attached to the framing surrounding the opening containing the product with the glazed opening. Panels shall be predrilled as required for the attachment method and secured with corrosion-resistant attachment hardware permanently installed on the building.
The text of Section 2.2 of ASTM E1996 shall be substituted as follows:
2.2 ASCE Standard:
ASCE 7-10 American Society of Civil Engineers Minimum Design Loads for Buildings and Other Structures
The text of Section 6.2.2 of ASTM E1996 shall be substituted as follows:
6.2.2 Unless otherwise specified, select the wind zone based on the ultimate design wind speed, Vult, as follows:
220.127.116.11 Wind Zone 1—130 mph ≤ ultimate design wind speed, Vult < 140 mph.
18.104.22.168 Wind Zone 2—140 mph ≤ ultimate design wind speed, Vult < 150 mph at greater than 1 mile (1.6 km) from the coastline. The coastline shall be measured from the mean high water mark.
22.214.171.124 Wind Zone 3—150 mph (58 m/s) ≤ ultimate design wind speed, Vult ≤ 170 mph (76 m/s), or 140 mph (54 m/s) ≤ ultimate design wind speed, Vult ≤ 170 mph (76 m/s) and within 1 mile (1.6 km) of the coastline. The coastline shall be measured from the mean high water mark.
126.96.36.199 Wind Zone 4—ultimate design wind speed, Vult > 170 mph (76 m/s).
Where referenced documents are based on nominal design wind speeds and do not provide the means for conversion between ultimate design wind speeds and nominal design wind speeds, the ultimate design wind speeds, Vult, of Figure R301.2(4) shall be converted to nominal design wind speeds, Vasd, using Table R301.2.1.3.
WIND SPEED CONVERSIONSa
For SI: 1 mile per hour = 0.447 m/s.
For each wind direction considered, an exposure category that adequately reflects the characteristics of ground surface irregularities shall be determined for the site at which the building or structure is to be constructed. For a site located in the transition zone between categories, the category resulting in the largest wind forces shall apply. Account shall be taken of variations in ground surface roughness that arise from natural topography and vegetation as well as from constructed features. For a site where multiple detached one- and two-family dwellings, townhouses or other structures are to be constructed as part of a subdivision or master-planned community, or are otherwise designated as a developed area by the authority having jurisdiction, the exposure category for an individual structure shall be based upon the site conditions that will exist at the time when all adjacent structures on the site have been constructed, provided that their construction is expected to begin within one year of the start of construction for the structure for which the exposure category is determined.
Exception: An intermediate exposure between the exposure categories defined is permitted in a transition zone provided that it is determined by a rational analysis method.
A ground surface roughness within each 45-degree (0.79 rad) sector shall be determined for a distance upwind of the site as defined in Section R301.2.1.4.3 from the categories defined below, for the purpose of assigning an exposure category as defined in Section R301.2.1.4.3.
- Urban and suburban areas, wooded areas or other terrain with numerous closely spaced obstructions having the size of single-family dwellings or larger.
- Open terrain with scattered obstructions having heights generally less than 30 feet (9144 mm). This category includes flat open country and grasslands. This Surface Roughness shall also apply to any building located within Surface Roughness B-type terrain where the building is within 100 feet (30.5 m) horizontally in any direction of open areas of Surface Roughness C- or D-type terrain that extends more than 600 feet (182.9 m) and width greater than 150 feet (45.7 m) in the upwind direction.
- Flat, unobstructed areas and water surfaces. This category includes smooth mud flats, salt flats and unbroken ice.
An exposure category shall be determined in accordance with the following:
- For buildings with a mean roof height of less than or equal to 30 feet (9144 mm), Exposure B shall apply where the ground surface roughness, as defined by Surface Roughness B, prevails in the upwind direction for a distance of at least 1,500 feet (457 m). For buildings with a mean roof height greater than 30 feet (9144 mm), Exposure B shall apply where Surface Roughness B prevails in the upwind direction for a distance of at least 2,600 feet (792 m) or 20 times the height of the building, whichever is greater.
- Exposure C shall apply for all cases where Exposures B or D do not apply.
- Exposure D shall apply where the ground surface roughness, as defined by Surface Roughness D, prevails in the upwind direction for a distance of at least 5,000 feet (1524 m) or 20 times the height of the building, whichever is greater. Exposure D shall also apply where the ground surface roughness immediately upwind of the site is B or C, and the site is within a distance of 600 feet (183 m) or 20 times the building height, whichever is greater, from an Exposure D condition as defined in the previous sentence.
In areas designated in Table R301.2(1) as having local historical data documenting structural damage to buildings caused by wind speed-up at isolated hills, ridges and escarpments that are abrupt changes from the general topography of the area, topographic wind effects shall be considered in the design of the building in accordance with Section R301.2.1.5.1 or in accordance with the provisions of ASCE 7. See Figure R301.2.1.5.1(1) for topographic features for wind speed-up effect.
As an alternative to the ASCE 7 topographic wind provisions, the provisions of Section R301.2.1.5.1 shall be permitted to be used to design for wind speed-up effects, where required by Section R301.2.1.5.
Structures located on the top half of isolated hills, ridges or escarpments meeting the conditions of Section R301.2.1.5 shall be designed for an increased basic wind speed as determined by Table R301.2.1.5.1. On the high side of an escarpment, the increased basic wind speed shall extend horizontally downwind from the edge of the escarpment 1.5 times the horizontal length of the upwind slope (1.5L) or 6 times the height of the escarpment (6H), whichever is greater. See Figure R301.2.1.5.1(2) for where wind speed increase is applied.
ULTIMATE DESIGN WIND SPEED MODIFICATION FOR TOPOGRAPHIC WIND EFFECTa, b
|ULTIMATE DESIGN |
WIND SPEED FROMFIGURE R301.2(4)
|AVERAGE SLOPE OF THE TOP HALF OF HILL, RIDGE OR ESCARPMENT (percent)|
|Required ultimate design wind speed-up, modified for topographic wind speed-up (mph)|
For SI: 1 mile per hour = 0.447 m/s, 1 foot = 304.8 mm.
The seismic provisions of this code shall apply as follows:
The seismic design categories and corresponding short-period design spectral response accelerations, SDS shown in Figure R301.2(2) are based on soil Site Class D, as defined in Section 1613.3.2 of the Florida Building Code, Building. If soil conditions are other than Site Class D, the shortperiod design spectral response accelerations, SDS, for a site can be determined in accordance with Section 1613.3 of the Florida Building Code, Building. The value of SDS determined in accordance with Section 1613.3 of the Florida Building Code, Building is permitted to be used to set the seismic design category in accordance with Table R301.2.2.1.1, and to interpolate other seismic design requirements of this code.
Average dead loads shall not exceed 15 pounds per square foot (720 Pa) for the combined roof and ceiling assemblies (on a horizontal projection) or 10 pounds per square foot (480 Pa) for floor assemblies, except as further limited by Section R301.2.2. Dead loads for walls above grade shall not exceed:
The seismic provisions of this code shall not be used for irregular structures located in Seismic Design Categories C, D0, D1 and D2. Irregular portions of structures shall be designed in accordance with accepted engineering practice to the extent the irregular features affect the performance of the remaining structural system. Where the forces associated with the irregularity are resisted by a structural system designed in accordance with accepted engineering practice, design of the remainder of the building shall be permitted using the provisions of this code. A building or portion of a building shall be considered to be irregular where one or more of the following conditions occur:
The provisions of this code shall apply to buildings with story heights not exceeding the following:
Individual walls or wall studs shall be permitted to exceed these limits as permitted by Chapter 6 provisions, provided that story heights are not exceeded. An engineered design shall be provided for the wall or wall framing members where the limits of Chapter 6 are exceeded. Where the story height limits of this section are exceeded, the design of the building, or the noncompliant portions thereof, to resist wind and seismic loads shall be in accordance with the Florida Building Code, Building.
The minimum uniformly distributed live load shall be as provided in Table R301.5.
MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS (in pounds per square foot)
|Uninhabitable attics without storageb||10|
|Uninhabitable attics with limited storageb, g||20|
|Habitable attics and attics served with fixed stairs||30|
|Balconies (exterior) and deckse||40|
|Guards and handrailsd||200h|
|Guard in-fill componentsf||50h|
|Passenger vehicle garagesa||50a|
|Rooms other than sleeping rooms||40|
For SI: 1 pound per square foot = 0.0479 kPa, 1 square inch = 645 mm2, 1 pound = 4.45 N.
The roof shall be designed for the live load indicated in Table R301.6 or the snow load indicated in Table R301.2(1), whichever is greater.
MINIMUM ROOF LIVE LOADS IN POUNDS-FORCE PER SQUARE FOOT OF HORIZONTAL PROJECTION
|ROOF SLOPE||TRIBUTARY LOADED AREA IN |
SQUARE FEET FOR ANYSTRUCTURAL MEMBER
|0 to 200||201 to 600||Over 600|
|Flat or rise less than 4 inches per |
|Rise 4 inches per foot (1:3) to |
less than 12 inches per foot (1:1)
|Rise 12 inches per foot (1:1) |
For SI: 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa, 1 inch per foot = 83.3 mm/m.
ALLOWABLE DEFLECTION OF STRUCTURAL MEMBERSb, c
|STRUCTURAL MEMBER||ALLOWABLE |
|Rafters having slopes greater than 3:12 with |
finished ceiling not attached to rafters
|Interior walls and partitions||H/180|
|Ceilings with brittle finishes (including plaster |
|Ceilings with flexible finishes (including gypsum |
|All other structural members||L/240|
|Exterior walls—wind loadsa with plaster or |
|Exterior walls—wind loadsa with other brittle |
|Exterior walls—wind loadsa with flexible finishes||H/120d|
|Lintels supporting masonry veneer wallse||L/600|
Note: L = span length, H = span height.
|EXTERIOR WALL ELEMENT||MINIMUM |
|MINIMUM FIRE |
|Walls||Fire-resistance rated||1 hour—tested in accordance with ASTM E119 or UL 263 with exposure from the |
outside or calculated per Florida Building Code, Building
|Not fire-resistance rated||0 hours||3 feeta|
|Projections||Not allowed||N/A||< 2 feet|
|Fire-resistance rated||1 hour on the underside, or heavy timber, or fire- |
retardant-treated woodb, c
|Not fire-resistance rated||0 hours||3 feet|
|Openings in walls||Not allowed||N/A||< 3 feet|
|Unlimited||0 hours||3 feeta|
|Penetrations||All||Comply with Section R302.4||< 3 feet|
|None required||3 feeta|
For SI: 1 foot = 304.8 mm.
N/A = Not Applicable.
Each townhouse shall be considered a separate building and shall be separated by separate fire-resistance rated exterior wall assemblies meeting the requirements of zero clearance from property lines of Section R302.1 for exterior walls.
Exception: A common 2-hour fire-resistance-rated wall assembly tested in accordance with ASTM E119, UL 263, or in accordance with the Florida Building Code, Building Section 722 is permitted for townhouses if such walls do not contain plumbing or mechanical equipment, ducts or vents in the cavity of the common wall unless such materials and methods of penetration comply with Section R302.4. The wall shall be rated for fire exposure from both sides and shall extend to and be tight against exterior walls and the underside of the roof sheathing. Electrical installations shall be installed in accordance with Chapter 34. Penetrations of electrical outlet boxes shall be in accordance with Section R302.4.
Each individual townhouse shall be structurally independent.
Dwelling units in two-family dwellings shall be separated from each other by wall and floor assemblies having not less than a 1-hour fire-resistance rating where tested in accordance with ASTM E119, UL 263 or Section 703.3 of the Florida Building Code, Building. Fire-resistance-rated floor/ceiling and wall assemblies shall extend to and be tight against the exterior wall, and wall assemblies shall extend from the foundation to the underside of the roof sheathing.
The garage shall be separated as required by Table R302.6. Openings in garage walls shall comply with Section R302.5. Attachment of gypsum board shall comply with Table R702.3.5. The wall separation provisions of Table R302.6 shall not apply to garage walls that are perpendicular to the adjacent dwelling unit wall.
|From the residence and attics||Not less than 1/2-inch gypsum board or equivalent applied to the |
|From habitable rooms above the garage||Not less than 5/8-inch Type X gypsum board or equivalent|
|Structure(s) supporting floor/ceiling assemblies used for separation |
required by this section
|Not less than 1/2-inch gypsum board or equivalent|
|Garages located less than 3 feet from a dwelling unit on the same lot||Not less than 1/2-inch gypsum board or equivalent applied to the interior |
side of exterior walls that are within this area
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
Wall and ceiling finishes shall have a flame spread index of not greater than 200.
Exception: Flame spread index requirements for finishes shall not apply to trim defined as picture molds, chair rails, baseboards and handrails; to doors and windows or their frames; or to materials that are less than 1/28 inch (0.91 mm) in thickness cemented to the surface of walls or ceilings if these materials exhibit flame spread index values not greater than those of paper of this thickness cemented to a noncombustible backing.
As an alternative to having a flame spread index of not greater than 200 and a smoke-developed index of not greater than 450 where tested in accordance with ASTM E84 or UL 723, wall and ceiling finishes shall be permitted to be tested in accordance with NFPA 286. Materials tested in accordance with NFPA 286 shall meet the following criteria:
The interior finish shall comply with the following:
Insulating materials installed within floor-ceiling assemblies, roof-ceiling assemblies, wall assemblies, crawl spaces and attics shall comply with the requirements of this section. They shall exhibit a flame spread index not to exceed 25 and a smoke-developed index not to exceed 450 where tested in accordance with ASTM E84 or UL 723. Insulating materials, where tested in accordance with the requirements of this section, shall include facings, where used, such as vapor retarders, vapor-permeable membranes and similar coverings.
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 Section R302.10.1 where tested in accordance with CAN/ULC S102.2.
Exception: Cellulosic fiber loose-fill insulation shall not be required to be tested in accordance with CAN/ULC S102.2, provided such insulation complies with the requirements of Sections R302.10.1 and R302.10.3.
In combustible construction, fireblocking shall be provided to cut off both vertical and horizontal concealed draft openings and to form an effective fire barrier between stories, and between a top story and the roof space.
Fireblocking shall be provided in wood-framed construction in the following locations:
In combustible construction where there is usable space both above and below the concealed space of a floor-ceiling assembly, draftstops shall be installed so that the area of the concealed space does not exceed 1,000 square feet (92.9 m2). Draftstopping shall divide the concealed space into approximately equal areas. Where the assembly is enclosed by a floor membrane above and a ceiling membrane below, draftstopping shall be provided in floor-ceiling assemblies under the following circumstances:
Floor assemblies that are not required elsewhere in this code to be fire-resistance rated, shall be provided with a 1/2-inch (12.7 mm) gypsum wallboard membrane, 5/8-inch (16 mm) wood structural panel membrane, or equivalent on the underside of the floor framing member. Penetrations or openings for ducts, vents, electrical outlets, lighting, devices, luminaires, wires, speakers, drainage, piping and similar openings or penetrations shall be permitted.
Combustible insulation shall be separated not less than 3 inches (76 mm) from recessed luminaires, fan motors and other heat-producing devices.
Exception: Where heat-producing devices are listed for lesser clearances, combustible insulation complying with the listing requirements shall be separated in accordance with the conditions stipulated in the listing.
Habitable rooms shall have an aggregate glazing area of not less than 8 percent of the floor area of such rooms. Natural ventilation shall be through windows, skylights, doors, louvers or other approved openings to the outdoor air. Such openings shall be provided with ready access or shall otherwise be readily controllable by the building occupants. The openable area to the outdoors shall be not less than 4 percent of the floor area being ventilated.
For the purpose of determining light and ventilation requirements, any room shall be considered to be a portion of an adjoining room where not less than one-half of the area of the common wall is open and unobstructed and provides an opening of not less than one-tenth of the floor area of the interior room and not less than 25 square feet (2.3 m2).
Exception: Openings required for light or ventilation shall be permitted to open into a sunroom with thermal isolation or a patio cover, provided that there is an openable area between the adjoining room and the sunroom or patio cover of not less than one-tenth of the floor area of the interior room and not less than 20 square feet (2 m2). The minimum openable area to the outdoors shall be based upon the total floor area being ventilated.
Exception: The glazed areas shall not be required where artificial light and a local exhaust system are provided. The minimum local exhaust rates shall be determined in accordance with Section M1507. Exhaust air from the space shall be exhausted directly to the outdoors.
Mechanical and gravity outdoor air intake openings shall be located not less than 10 feet (3048 mm) from any hazardous or noxious contaminant, such as vents, chimneys, plumbing vents, streets, alleys, parking lots and loading docks.
Interior stairways shall be provided with an artificial light source to illuminate the landings and treads. The light source shall be capable of illuminating treads and landings to levels of not less than 1 footcandle (11 lux) as measured at the center of treads and landings. There shall be a wall switch at each floor level to control the light source where the stairway has six or more risers.
Habitable rooms shall have a floor area of not less than 70 square feet (6.5 m2).
Fixtures shall be spaced in accordance with Figure R307.1, and in accordance with the requirements of Section P2705.1.
Except as indicated in Section R308.1.1 each pane of glazing installed in hazardous locations as defined in Section R308.4 shall be provided with a manufacturer's designation specifying who applied the designation, designating the type of glass and the safety glazing standard with which it complies, which is visible in the final installation. The designation shall be acid etched, sandblasted, ceramic-fired, laser etched, embossed, or be of a type that once applied cannot be removed without being destroyed. A label shall be permitted in lieu of the manufacturer's designation.
Where required by other sections of the code, glazing shall be tested in accordance with CPSC 16 CFR 1201. Glazing shall comply with the test criteria for Category II unless otherwise indicated in Table R308.3.1(1).
Exception: Glazing not in doors or enclosures for hot tubs, whirlpools, saunas, steam rooms, bathtubs and showers shall be permitted to be tested in accordance with ANSI Z97.1. Glazing shall comply with the test criteria for Class A unless indicated in Table R308.3.1(2).
MINIMUM CATEGORY CLASSIFICATION OF GLAZING USING CPSC 16 CFR 1201
|EXPOSED SURFACE |
AREA OF ONE SIDEOF ONE LITE
|GLAZING IN |
|GLAZING IN |
|GLAZED PANELS |
REGULATED BYSECTION R308.4.3
|GLAZED PANELS |
REGULATED BYSECTION R308.4.2
|GLAZING IN |
REGULATED BYSECTION 308.4.5
|SLIDING GLASS |
DOORS PATIO TYPE(Category Class)
|9 square feet or less||I||I||NR||I||II||II|
|More than 9 square feet||II||II||II||II||II||II|
For SI: 1 square foot = 0.0929 m2.
NR = "No Requirement."
MINIMUM CATEGORY CLASSIFICATION OF GLAZING USING ANSI Z97.1
|EXPOSED SURFACE AREA |
OF ONE SIDE OF ONE LITE
|GLAZED PANELS REGULATED BY |
|GLAZED PANELS REGULATED BY |
|DOORS AND ENCLOSURES REGULATED |
BY SECTION R308.4.5a
|9 square feet or less||No requirement||B||A|
|More than 9 square feet||A||A||A|
For SI: 1 square foot = 0.0929 m2.
Glazing in fixed and operable panels of swinging, sliding and bifold doors shall be considered to be a hazardous location.
Glazing in an individual fixed or operable panel adjacent to a door shall be considered to be a hazardous location where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) above the floor or walking surface and it meets either of the following conditions:
Glazing in an individual fixed or operable panel that meets all of the following conditions shall be considered to be a hazardous location:
Glazing in walls, enclosures or fences containing or facing hot tubs, spas, whirlpools, saunas, steam rooms, bathtubs, showers and indoor or outdoor swimming pools where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface shall be considered to be a hazardous location. This shall apply to single glazing and each pane in multiple glazing.
Exception: Glazing that is more than 60 inches (1524 mm), measured horizontally and in a straight line, from the water's edge of a bathtub, hot tub, spa, whirlpool or swimming pool or from the edge of a shower, sauna or steam room.
Glazing adjacent to the landing at the bottom of a stairway where the glazing is less than 36 inches (914 mm) above the landing and within a 60-inch (1524 mm) horizontal arc less than 180 degrees from the bottom tread nosing shall be considered to be a hazardous location. See Figure R308.4.7.
The following types of glazing shall be permitted to be used:
Screens shall not be required where laminated glass complying with Item 1 of Section R308.6.2 is used as single glazing or the inboard pane in multiple glazing. Screens shall not be required where fully tempered glass is used as single glazing or the inboard pane in multiple glazing and either of the following conditions is met:
Carports shall be open on not less than two sides. Carport floor surfaces shall be of approved noncombustible material. Carports not open on two or more sides shall be considered to be a garage and shall comply with the provisions of this section for garages.
Exception: Asphalt surfaces shall be permitted at ground level in carports.
Basements, habitable attics and every sleeping room shall have not less than one operable emergency escape and rescue opening. Where basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be required in each sleeping room. Emergency escape and rescue openings shall open directly into a public way, or to a yard or court that opens to a public way.
Emergency and escape rescue openings shall have a net clear opening of not less than 5.7 square feet (0.530 m2). The net clear opening dimensions required by this section shall be obtained by the normal operation of the emergency escape and rescue opening from the inside. The net clear height opening shall be not less than 24 inches (610 mm) and the net clear width shall be not less than 20 inches (508 mm).
The horizontal area of the window well shall be not less than 9 square feet (0.9 m2), with a horizontal projection and width of not less than 36 inches (914 mm). The area of the window well shall allow the emergency escape and rescue opening to be fully opened.
Exception: The ladder or steps required by Section R310.2.3.1 shall be permitted to encroach not more than 6 inches (152 mm) into the required dimensions of the window well.
Exception: A drainage system for window wells is not required where the foundation is on well-drained soil or sand-gravel mixture soils in accordance with the United Soil Classification System, Group I Soils, as detailed in Table R405.1.
Exception: A drainage system for area wells is not required where the foundation is on well-drained soil or sand-gravel mixture soils in accordance with the United Soil Classification System, Group I Soils, as detailed in Table R405.1.