ADOPTS WITH AMENDMENTS:

International Building Code 2018 (IBC 2018)

Heads up: There are no amended sections in this chapter.

Appendix P Tall Wood Buildings

AMENDMENT
This section has been amended at the state or city level.

Section AP101 General

AMENDMENT
This section has been amended at the state or city level.

AP101.1 General

AMENDMENT
This section has been amended at the state or city level.
The provisions of this appendix apply to buildings of Type IVA, IVB, IVC and IV-HT construction. Type IVA, IVB, IVC and IV-HT construction may comply with this appendix as an alternate design option. These provisions are in addition to or replace the specified sections of the Building Code. Where provisions are not specified in or replaced by this appendix, the provisions of the Building Code shall apply.

AP102.1 Inspections

AMENDMENT
This section has been amended at the state or city level.
The following requirement is in addition to those specified in Section 110 of the Building Code.

P110.3.4.1 Type IVA, IVB and IVC connection protection inspection. In buildings of Type IVA, IVB and IVC construction, where connection fire-resistance ratings are provided by wood cover calculated to meet the requirements of Section P2304.11.1, inspection of the wood cover shall be made after the cover is installed, but before any other coverings or finishes are installed.

Section AP102 Definitions

AMENDMENT
This section has been amended at the state or city level.

AP102.1 Definitions

AMENDMENT
This section has been amended at the state or city level.
Where terms are not defined in this section, the definitions in Chapter 2 of the Building Code shall apply. Terms that are not defined shall have their ordinarily accepted meanings within the context in which they are used.

MASS TIMBER. Structural elements of Type IV construction primarily of solid, built-up, panelized or engineered wood products that meet minimum cross-section dimensions of Type IV construction.

NONCOMBUSTIBLE PROTECTION (FOR MASS TIMBER). Noncombustible material, in accordance with Section 703.5 of the Building Code, designed to increase the fire-resistance rating and delay the combustion of mass timber.

WALL, LOAD-BEARING. Any wall meeting either of the following classifications:
  1. Any metal or wood stud wall that supports more than 100 pounds per linear foot (1459 N/m) of vertical load in addition to its own weight.
  2. Any masonry, concrete or mass timber wall that supports more than 200 pounds per linear foot (2919 N/m) of vertical load in addition to its own weight.

Section AP103 Special Detailed Requirements Based on Occupancy and Use

AMENDMENT
This section has been amended at the state or city level.

AP103.1 Automatic Sprinkler System

AMENDMENT
This section has been amended at the state or city level.
The following replaces Section 403.3.2 of the Building Code.

P403.3.2 Water supply to required fire pumps. In buildings that are more than 420 feet (128 m) in building height, and buildings of Type IVA and IVB construction that are more than 120 feet in building height, required fire pumps shall be supplied by connections to not fewer than two water mains located in different streets. Separate supply piping shall be provided between each connection to the water main and the pumps. Each connection and the supply piping between the connection and the pumps shall be sized to supply the flow and pressure required for the pumps to operate.
Exception: Two connections to the same main shall be permitted provided that the main is valved such that an interruption can be isolated so that the water supply will continue without interruption through not fewer than one of the connections.

Section AP104 General Building Heights and Areas

AMENDMENT
This section has been amended at the state or city level.

AP104.1 Separated Occupancies

AMENDMENT
This section has been amended at the state or city level.
The following replaces Section 508.4.4.1 of the Building Code.

     P508.4.4.1 Construction. Required separations shall be fire barriers constructed in accordance with Section 707 of the Building Code or horizontal assemblies constructed in accordance with Section 711 of the Building Code, or both, so as to completely separate adjacent occupancies. Mass timber elements serving as fire barriers or horizontal assemblies to separate occupancies in Type IVB or IVC construction shall be separated from the interior of the building with an approved thermal barrier consisting of a minimum of 1/2-inch (12.7 mm) gypsum board or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.

AP104.2 Separated Occupancies

AMENDMENT
This section has been amended at the state or city level.
The following is added to Section 509.4.1 of the Building Code.

P509.4.1.1 Type IVB and IVC construction. Where Table 509 of the Building Code specifies a fire-resistancerated separation, mass timber elements serving as fire barriers or a horizontal assembly in Type IVB or IVC construction shall be separated from the interior of the incidental use with an approved thermal barrier consisting of a minimum of 1/2-inch (12.7 mm) gypsum board or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.

AP104.3 Allowable Heights, Stories and Areas

AMENDMENT
This section has been amended at the state or city level.
The allowable heights, stories and areas for Type IVA, IVB and IVC construction shall be determined by Table AP104.3.

TABLE AP104.3
TYPE IVA, IVB AND IVC CONSTRUCTION ALLOWABLE HEIGHTS, STORIES AND AREAS a, b, c(This table combines the provisions of Tables 504.3, 504.4 and 506.2 of the Building Code.)
OCCUPANCY TYPE IV
A B C
A-1 65' NS 65' NS 65' NS
270' S 180' S 85' S
3 stories NS 3 stories NS 3 stories NS
9 stories S 6 stories S 4 stories S
45,000 sq. ft. NS 30,000 sq. ft. NS 18,750 sq. ft. NS
180,000 sq. ft. S 120,000 sq. ft. S 75,000 sq. ft. S
135,000 sq. ft. SM 90,000 sq. ft. SM 56,250 sq. ft. SM
A-2 65' NS 65' NS 65' NS
270' S 180' S 85' S
3 stories NS 3 stories NS 3 stories NS
18 stories S 12 stories S 6 stories S
45,000 sq. ft. NS 30,000 sq. ft. NS 18,750 sq. ft. NS
180,000 sq. ft. S 120,000 sq. ft. S 75,000 sq. ft. S
135,000 sq. ft. SM 90,000 sq. ft. SM 56,250 sq. ft. SM
A-3 65' NS 65' NS 65' NS
270' S 180' S 85' S
3 stories NS 3 stories NS 3 stories NS
18 stories S 12 stories S 6 stories S
45,000 sq. ft. NS 30,000 sq. ft. NS 18,750 sq. ft. NS
180,000 sq. ft. S 120,000 sq. ft. S 75,000 sq. ft. S
135,000 sq. ft. SM 90,000 sq. ft. SM 56,250 sq. ft. SM
A-4 65' NS 65' NS 65' NS
270' S 180' S 85' S
3 stories NS 3 stories NS 3 stories NS
18 stories S 12 stories S 6 stories S
45,000 sq. ft. NS 30,000 sq. ft. NS 18,750 sq. ft. NS
180,000 sq. ft. S 120,000 sq. ft. S 75,000 sq. ft. S
135,000 sq. ft. SM 90,000 sq. ft. SM 56,250 sq. ft. SM
A-5 65' NS 65' NS 65' NS
270' S 180' S 85' S
1 story NS 1 story NS 1 story NS
UL stories S UL stories S UL stories S
UL Area sq. ft. UL Area sq. ft. UL Area sq. ft.
B 65' NS 65' NS 65' NS
270' S 180' S 85' S
5 stories NS 5 stories NS 5 stories NS
18 stories S 12 stories S 9 stories S
108,000 sq. ft. NS 72,000 sq. ft. NS 45,000 sq. ft. NS
432,000 sq. ft. S 288,000 sq. ft. S 180,000 sq. ft. S
324,000 sq. ft. SM 216,000 sq. ft. SM 135,000 sq. ft. SM
E 65' NS 65' NS 65' NS
270' S 120' S 85' S
3 stories NS 3 stories NS 3 stories NS
9 stories S 6 stories S 4 stories S
76,500 sq. ft. NS 51,000 sq. ft. NS 31,875 sq. ft. NS
306,000 sq. ft. S 204,000 sq. ft. S 127,500 sq. ft. S
229,500 sq. ft. SM 153,000 sq. ft. SM 95,625 sq. ft. SM
F-1 65' NS 65' NS 65' NS
270' S 120' S 85' S
3 stories NS 3 stories NS 3 stories NS
10 stories S 7 stories S 5 stories S
100,500 sq. ft. NS 67,000 sq. ft. NS 41,875 sq. ft. NS
402,000 sq. ft. S 268,000 sq. ft. S 167,500 sq. ft. S
301,500 sq. ft. SM 201,000 sq. ft. SM 125,625 sq. ft. SM
F-2 65' NS 65' NS 65' NS
270' S 180' S 85' S
5 stories NS 5 stories NS 5 stories NS
12 stories S 8 stories S 6 stories S
151,000 sq. ft. NS 101,000 sq. ft. NS 63,125 sq. ft. NS
606,000 sq. ft. S 404,000 sq. ft. S 252,500 sq. ft. S
454,500 sq. ft. SM 303,000 sq. ft. SM 189,375 sq. ft. SM
H-1 120' S 90' S 65' S
1 story S 1 story S 1 story S
10,500 sq. ft. S 10,500 sq. ft. S 10,500 sq. ft. S
H-2 120' S 90' S 65' S
2 stories S 2 stories S 2 stories S
10,500 sq. ft. S 10,500 sq. ft. S 10,500 sq. ft. S
H-3 120' S 90' S 65' S
4 stories S 4 stories S 4 stories S
25,500 sq. ft. S 25,500 sq. ft. S 25,500 sq. ft. S
H-4 140' S 100' S 85' S
8 stories S 7 stories S 6 stories S
288,000 sq. ft. S 216,000 sq. ft. S 162,000 sq. ft. S
216,000 sq. ft. SM 162,000 sq. ft. SM 121,500 sq. ft. SM
H-5 120' S 90' S 65' S
3 stories S 3 stories S 3 stories S
288,000 sq. ft. S 216,000 sq. ft. S 162,000 sq. ft. S
216,000 sq. ft. SM 162,000 sq. ft. SM 121,500 sq. ft. SM
I-1 Condition 1 65' (13R) 65' (13R) 65' (13R)
180' S 120' S 85' S
4 stories (13R) 4 stories (13R) 4 stories (13R)
10 stories S 7 stories S 5 stories S
54,000 sq. ft. (13R) 36,000 sq. ft. (13R) 18,000 sq. ft. (13R)
216,000 sq. ft. S 144,000 sq. ft. S 72,000 sq. ft. S
162,000 sq. ft. SM 108,000 sq. ft. SM 54,000 sq. ft. SM
I-1 Condition 2 65' S 65' S 65' S
10 stories S 6 stories S 4 stories S
216,000 sq. ft. S 144,000 sq. ft. S 72,000 sq. ft. S
162,000 sq. ft. SM 108,000 sq. ft. SM 54,000 sq. ft. SM
I-2 65' S 65' S 65' S
7 stories S 5 stories S 1 story S
144,000 sq. ft. S 96,000 sq. ft. S 48,000 sq. ft. S
108,000 sq. ft. SM 72,000 sq. ft. SM 36,000 sq. ft. SM
I-3 180' S 120' S 85' S
7 stories S 5 stories S 3 stories S
144,000 sq. ft. S 96,000 sq. ft. S 48,000 sq. ft. S
108,000 sq. ft. SM 72,000 sq. ft. SM 36,000 sq. ft. SM
I-4 65' NS 65' NS 65' NS
180' S 120' S 85' S
3 stories NS 3 stories NS 3 stories NS
9 stories S 6 stories S 4 stories S
76,500 sq. ft. NS 51,000 sq. ft. NS 25,500 sq. ft. NS
306,000 sq. ft. S 204,000 sq. ft. S 102,000 sq. ft. S
229,500 sq. ft. SM 153,000 sq. ft. SM 76,500 sq. ft. SM
M 65' NS 65' NS 65' NS
270' S 180' S 85' S
4 stories NS 4 stories NS 4 stories NS
12 stories S 8 stories S 6 stories S
61,500 sq. ft. NS 41,000 sq. ft. NS 25,625 sq. ft. NS
246,000 sq. ft. S 164,000 sq. ft. S 102,500 sq. ft. S
184,500 sq. ft. SM 123,000 sq. ft. SM 76,875 sq. ft. SM
R-1, R-2, R-4 65' (13R) 65' (13R) 65' (13R)
270' S 180' S 85' S
4 stories (13R) 4 stories (13R) 4 stories (13R)
18 stories S 12 stories S 8 stories
(R-4 = 5 stories)
S
S
61,500 sq. ft. (13R) 41,000 sq. ft. (13R) 25,625 sq. ft. (13R)
246,000 sq. ft. S 164,000 sq. ft. S 102,500 sq. ft. S
184,500 sq. ft. SM 123,000 sq. ft. SM 76,875 sq. ft. SM
R-3 65' (13D) 65' (13D) 65' (13D)
270' S 180' S 85' S
4 stories (13D) 4 stories (13D) 4 stories (13D)
18 stories S 12 stories S 5 stories S
UL Area sq. ft. (13D) UL Area sq. ft. (13D) UL Area sq. ft. (13D)
S-1 65' NS 65' NS 65' NS
270' S 180' S 85' S
4 stories NS 4 stories NS 4 stories NS
10 stories S 7 stories S 5 stories S
76,500 sq. ft. NS 51,000 sq. ft. NS 31,875 sq. ft. NS
306,000 sq. ft. S 204,000 sq. ft. S 127,500 sq. ft. S
229,500 sq. ft. SM 153,000 sq. ft. SM 95,625 sq. ft. SM
S-2, S-3 65' NS 65' NS 65' NS
270' S 180' S 85' S
4 stories NS 4 stories NS 4 stories NS
12 stories S 8 stories S 5 stories S
115,500 sq. ft. NS 77,000 sq. ft. NS 48,125 sq. ft. NS
462,000 sq. ft. S 308,000 sq. ft. S 192,500 sq. ft. S
346,500 sq. ft. SM 231,000 sq. ft. SM 144,375 sq. ft. SM
U 65' NS 65' NS 65' NS
270' S 180' S 85' S
4 stories NS 4 stories NS 4 stories NS
9 stories S 6 stories S 5 stories S
54,000 sq. ft. NS 36,000 sq. ft. NS 22,500 sq. ft. NS
216,000 sq. ft. S 144,000 sq. ft. S 90,000 sq. ft. S
162,000 sq. ft. SM 108,000 sq. ft. SM 67,500 sq. ft. SM

UL = Unlimited
S = Buildings equipped throughout with an NFPA 13 automatic sprinkler system.
NS = Buildings not equipped throughout with an NFPA 13 automatic sprinkler system.
S1 = Buildings a maximum of one story above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 of the Building Code.
SM = Buildings two or more stories above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1 of the Building Code.
13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2 of the Building Code.
13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3 of the Building Code.
  1. See Chapters 4 and 5 of the Building Code for specific exceptions to the allowable height in this chapter.
  2. See Section 903.2 of the Building Code for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
  3. Section 506 of the Building Code shall be used for any possible allowable area increases to the tabular values.

Section AP105 Types of Construction

AMENDMENT
This section has been amended at the state or city level.

AP105.1 General

AMENDMENT
This section has been amended at the state or city level.
Sections P602.4 through P602.4.4.3 replace Section 602.4 through 602.4.3 of the Building Code.

P602.4 Type IV. Type IV construction is that type of construction in which the building elements are mass timber or noncombustible materials and have fire-resistance ratings in accordance with Table P601. Mass timber elements shall meet the fire-resistance rating requirements of this section based on either the fire-resistance rating of the noncombustible protection, the mass timber, or a combination of both and shall be determined in accordance with Section 703.2 or 703.3 of the Building Code. The minimum dimensions and permitted materials for building elements shall comply with the provisions of this section and Section P2304.11. Mass timber elements of Types IVA, IVB and IVC construction shall be protected with noncombustible protection applied directly to the mass timber in accordance with Sections P602.4.1 through P602.4.3. The time assigned to the noncombustible protection shall be determined in accordance with Section P703.8 and comply with Section P722.7.

     Cross-laminated timber shall be labeled as conforming to PRG 320-18 as referenced in Section P2303.1.12.

     Exterior load-bearing walls and nonload-bearing walls shall be mass timber construction or shall be of noncombustible construction.
Exception: Exterior load-bearing walls and nonload-bearing walls of Type IV-HT construction in accordance with Section P602.4.4.

     The interior building elements, including nonloadbearing walls and partitions, shall be of mass timber construction or of noncombustible construction.
Exception: Interior building elements and nonloadbearing walls and partitions of Type IV-HT construction in accordance with Section P602.4.4.

     Combustible concealed spaces are permitted only as indicated in Sections P602.4.1 through P602.4.4. Combustible stud spaces within light-frame walls of Type IV-HT construction shall not be considered concealed spaces but shall comply with Section 718 of the Building Code. In buildings of Type IVA, IVB and IVC construction with an occupied floor located more than 75 feet above the lowest level of fire department access, up to and including 12 stories or 180 feet above grade plane, mass timber interior exit and elevator hoistway enclosures shall be protected in accordance with Section P602.4.1.2. In buildings greater than 12 stories or 180 feet above grade plane, interior exit and elevator hoistway enclosures shall be constructed of noncombustible materials.

P602.4.1 Type IVA. Building elements in Type IVA construction shall be protected in accordance with Sections P602.4.1.1 through P602.4.1.6. The required fire-resistance rating of noncombustible elements and protected mass timber elements shall be determined in accordance with Section 703.2 or Section 703.3 of the Building Code.

P602.4.1.1 Exterior protection. The outside face of exterior walls of mass timber construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes as determined in Section P722.7.1(1). All components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150 kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18 MJ/kg, as determined in accordance with ASTM E1354, and having a flame spread index of 25 or less and a smoke-developed index of 450 or less, as determined in accordance with ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.

P602.4.1.2 Interior protection. Interior faces of all mass timber elements, including the inside faces of exterior mass timber walls and mass timber roofs, shall be protected with materials complying with Section 703.5 of the Building Code.

P602.4.1.2.1 Protection time. Noncombustible protection shall contribute a time equal to or greater than times assigned in Table P722.7.1(1), but not less than 80 minutes. The use of materials and their respective protection contributions listed in Table P722.7.1(2) shall be permitted to be used for compliance with Section P722.7.1.

P602.4.1.3 Floors. The floor assembly shall contain a noncombustible material not less than 1 inch in thickness above the mass timber. Floor finishes in accordance with Section 804 of the Building Code shall be permitted on top of the noncombustible material. The underside of floor assemblies shall be protected in accordance with P602.4.1.2.

P602.4.1.4 Roofs. The interior surfaces of roof assemblies shall be protected in accordance with Section P602.4.1.2. Roof coverings in accordance with Chapter 15 of the Building Code shall be permitted on the outside surface of the roof assembly.

P602.4.1.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the Mechanical Code and shall comply with all applicable provisions of Section 718 of the Building Code. Combustible construction forming concealed spaces shall be protected in accordance with Sections P602.4.1.2.

P602.4.1.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718 of the Building Code. Both the shaft side and room side of mass timber elements shall be protected in accordance with Section P602.4.1.2.

P602.4.2 Type IVB. Building elements in Type IVB construction shall be protected in accordance with Sections P602.4.2.1 through P602.4.2.6. The required fire-resistance rating of noncombustible elements or mass timber elements shall be determined in accordance with Section 703.2 or 703.3 of the Building Code.

P602.4.2.1 Exterior protection. The outside face of exterior walls of mass timber construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as determined in Section P722.7.1(1). All components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150 kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18 MJ/kg, as determined in accordance with ASTM E1354, and having a flame spread index of 25 or less and a smokedeveloped index of 450 or less, as determined in accordance with ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.

P602.4.2.2 Interior protection. Interior faces of all mass timber elements, including the inside face of exterior mass timber walls and mass timber roofs, shall be protected, as required by this section, with materials complying with Section 703.5 of the Building Code.

P602.4.2.2.1 Protection time. Noncombustible protection shall contribute a time equal to or greater than times assigned in Table P722.7.1(1), but not less than 80 minutes. The use of materials and their respective protection contributions listed in Table P722.7.1(2) shall be permitted to be used for compliance with Section P722.7.1.

P602.4.2.2.2 Protected area. All interior faces of all mass timber elements shall be protected in accordance with Section P602.4.2.2.1, including the inside face of exterior mass timber walls and mass timber roofs.
Exceptions: Unprotected portions of mass timber ceilings and walls complying with Section P602.4.2.2.4 and the following:
  1. Unprotected portions of mass timber ceilings, including attached beams, shall be permitted and shall be limited to an area equal to 20 percent of the floor area in any dwelling unit or fire area.
  2. Unprotected portions of mass timber walls, including attached columns, shall be permitted and shall be limited to an area equal to 40 percent of the floor area in any dwelling unit or fire area.
  3. Unprotected portions of both walls and ceilings of mass timber, including attached columns and beams, in any dwelling unit or fire area shall be permitted in accordance with Section P602.4.2.2.3.
  4. Mass timber columns and beams that are not an integral portion of walls or ceilings, respectively, shall be permitted to be unprotected without restriction of either aggregate area or separation from one another.
P602.4.2.2.3 Mixed unprotected areas. In each dwelling unit or fire area, where both portions of ceilings and portions of walls are unprotected, the total allowable unprotected area shall be determined in accordance with Equation P6-1.

(Utc/Uac) + (Utw/Uaw) ≤ 1 (Equation P6-1)

where:

Utc = Total unprotected mass timber ceiling area.
Uac = Allowable unprotected mass timber ceiling area conforming to Section P602.4.2.2.2, Exception 1.
Utw = Total unprotected mass timber wall areas.
Uaw = Allowable unprotected mass timber wall area conforming to Section P602.4.2.2.2, Exception 2.


P602.4.2.2.4 Separation distance between unprotected mass timber elements. In each dwelling unit or fire area, unprotected portions of mass timber walls and ceilings shall be not less than 15 feet from unprotected portions of other walls and ceilings, measured horizontally along the ceiling and from other unprotected portions of walls measured horizontally along the floor.

P602.4.2.3 Floors. The floor assembly shall contain a noncombustible material not less than 1 inch in thickness above the mass timber. Floor finishes in accordance with Section 804 of the Building Code shall be permitted on top of the noncombustible material. The underside of floor assemblies shall be protected in accordance with Section P602.4.1.2.

P602.4.2.4 Roofs. The interior surfaces of roof assemblies shall be protected in accordance with Section P602.4.2.2 except in nonoccupiable spaces, they shall be treated as a concealed space with no portion left unprotected. Roof coverings in accordance with Chapter 15 of the Building Code shall be permitted on the outside surface of the roof assembly.

P602.4.2.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the Mechanical Code and shall comply with all applicable provisions of Section 718 of the Building Code. Combustible construction forming concealed spaces shall be protected in accordance with Section P602.4.1.2.

P602.4.2.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718 of the Building Code. Both the shaft side and room side of mass timber elements shall be protected in accordance with Section P602.4.1.2.

P602.4.3 Type IVC. Building elements in Type IVC construction shall be protected in accordance with Sections P602.4.3.1 through P602.4.3.6. The required fire-resistance rating of building elements shall be determined in accordance with Section 703.2 or 703.3 of the Building Code.

P602.4.3.1 Exterior protection. The exterior side of walls of combustible construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as determined in Section P722.7.1(1). All components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150 kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18 MJ/kg, as determined in accordance with ASTM E1354, and having a flame spread index of 25 or less, and a smoke-developed index of 450 or less, as determined in accordance with ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.

P602.4.3.2 Interior protection. Mass timber elements are permitted to be unprotected.

P602.4.3.3 Floors. Floor finishes in accordance with Section 804 of the Building Code shall be permitted on top of the floor construction.

P602.4.3.4 Roofs. Roof coverings in accordance with Chapter 15 of the Building Code shall be permitted on the outside surface of the roof assembly.

P602.4.3.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the Mechanical Code and shall comply with all applicable provisions of Section 718 of the Building Code. Combustible construction forming concealed spaces shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as determined in Section P722.7.1(1).

P602.4.3.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718 of the Building Code. Shafts, elevator hoistways and interior exit stairway enclosures shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as determined in Section P722.7.1(1), on both the inside of the shaft and the outside of the shaft.

P602.4.4 Type IV-HT. Type IV-HT construction (Heavy Timber, HT) is that type of construction in which the exterior walls are of noncombustible materials and the interior building elements are of solid wood, laminated heavy timber or structural composite lumber (SCL), without concealed spaces. The minimum dimensions for permitted materials including solid timber, glued-laminated timber, structural composite lumber (SCL) and cross-laminated timber (CLT) and details of Type IV-HT construction shall comply with the provisions of this section and Section P2304.11. Exterior walls complying with Section P602.4.4.1 or P602.4.4.2 shall be permitted. Interior walls and partitions not less than 1-hour fire-resistance rating or heavy timber conforming with Section P2304.11.2.2 shall be permitted.

P602.4.4.1 Fire-retardant-treated wood in exterior walls. Fire-retardant-treated wood framing and sheathing complying with Section P2303.2 shall be permitted within exterior wall assemblies not less than 6 inches (152 mm) in thickness with a 2-hour rating or less.

P602.4.4.2 Cross-laminated timber in exterior walls. Cross-laminated timber complying with Section P2303.1.12 shall be permitted within exterior wall assemblies not less than 6 inches (152 mm) in thickness with a 2-hour rating or less, provided that the exterior surface of the cross-laminated timber is protected by one the following:
  1. Fire-retardant-treated wood sheathing complying with Section P2303.2 and not less than 15/32 inch (12 mm) thick.
  2. Gypsum board not less than 1/2 inch (12.7 mm) thick.
  3. A noncombustible material.
P602.4.4.3 Exterior structural members. Where a horizontal separation of 20 feet (6096 mm) or more is provided, wood columns and arches conforming to heavy timber sizes complying with Section P2304.11 shall be permitted to be used externally.

TABLE P601
FIRE-RESISTANCE-RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)
BUILDING ELEMENT TYPE IV
A B C HT
Primary structural framef 3a 2a 2a HT
Bearing walls
Exteriore, f 3 2 2 2
Interior 3 2 2 1/HT
Nonbearing walls and partitions
Exterior
See Table P602
Nonbearing walls and partitions
Interiord
0 0 0 See Section P2304.11.2
Floor construction and associated secondary members
(see Section 202 of the Building Code)
2 2 2 HT
Roof construction and associated secondary members
(see Section 202 of the Building Code)
1.5 1 1 HT
For SI: 1 foot = 304.8 mm.
  1. Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only. This reduction is not applicable to roofs supporting rooftop structures governed by Section 1509 of the Building Code, roof gardens and landscaped roofs.
  2. Except in Group F-1, H, M and S-1 occupancies, fire protection of structural members shall not be required, including protection of roof framing and decking where every part of the roof construction is 20 feet or more above any floor immediately below. Fire-retardant-treated wood members shall be allowed to be used for such unprotected members.
  3. In all occupancies, heavy timber shall be allowed where a 1-hour or less fire-resistance rating is required.
  4. Not less than the fire-resistance rating required by other sections of this code.
  5. Not less than the fire-resistance rating based on fire separation distance (see Table P602).
  6. Not less than the fire-resistance rating as referenced in Section 704.10 of the Building Code.
TABLE P602
FIRE-RESISTANCE-RATING REQUIREMENTS FOR EXTERIOR WALLS BASED ON FIRE SEPARATION DISTANCE a, e, h
FIRE SEPARATION
DISTANCE = x (feet)
TYPE OF
CONSTRUCTION
OCCUPANCY
GROUP Hf
OCCUPANCY
GROUP F-1, M, S-1g
OCCUPANCY
GROUP A, B, E, F-2, I, R, S-2g, S-3g, Ub
x < 5c All 3 2 1
5 ≤ x < 10 IA, IVA
Others
3
2
2
1
1
1
10 ≤ x < 30 IA, IB, IVA, IVB
IIB, VB
Others
2
1
1
1
0
1
1d
0
1d
x ≥ 30 All 0 0 0
For SI: 1 foot = 304.8 mm.
  1. Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table P601.
  2. For special requirements for Group U occupancies, see Section 406.3 of the Building Code.
  3. See Section 706.1.1 of the Building Code for party walls.
  4. Open parking garages complying with Section 406 of the Building Code shall not be required to have a fire-resistance rating.
  5. The fire-resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located.
  6. For special requirements for Group H occupancies, see Section 415.5 of the Building Code.
  7. For special requirements for Group S aircraft hangars, see Section 412.4.1 of the Building Code.
  8. Where Table 705.8 of the Building Code permits nonbearing exterior walls with unlimited area of unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours.

Section AP106 Fire and Smoke Protection Features

AMENDMENT
This section has been amended at the state or city level.

AP106.1 Fire-Resistance Ratings and Fire Tests

AMENDMENT
This section has been amended at the state or city level.
Sections P703.8 and P703.9 are added to Section 703 of the Building Code.

P703.8 Determination of noncombustible protection time contribution. The time, in minutes, contributed to the fire-resistance rating by the noncombustible protection of mass timber building elements, components or assemblies shall be established through a comparison of assemblies tested using procedures set forth in ASTM E119 or UL 263. The test assemblies shall be identical in construction, loading and materials other than the noncombustible protection. The two test assemblies shall be tested to the same criteria of structural failure.
  1. Test Assembly 1 shall be without protection.
  2. Test Assembly 2 shall include the representative noncombustible protection. The protection shall be fully defined in terms of configuration details, attachment details, joint sealing details, accessories and all other relevant details.
     The noncombustible protection time contribution shall be determined by subtracting the fire-resistance time, in minutes, of Test Assembly 1 from the fire-resistance time, in minutes, of Test Assembly 2.

P703.9 Sealing of adjacent mass timber elements. In buildings of Type IVA, IVB and IVC construction, sealant or adhesive shall be provided to resist the passage of air in the following locations:
  1. At abutting edges and intersections of mass timber building elements required to be fire-resistance rated.
  2. At abutting intersections of mass timber building elements and building elements of other materials where both are required to be fire-resistance rated.
     Sealants shall meet the requirements of ASTM C920. Adhesives shall meet the requirements of ASTM D3498.
Exception: Where sealant or adhesive is not a required component of a fire-resistance-rated assembly.

AP106.2 Concealed Spaces

AMENDMENT
This section has been amended at the state or city level.
Section P718.2.1 replaces Section 718.2.1 of the Building Code.

P718.2.1 Fireblocking materials. Fireblocking shall consist of the following materials:
  1. Two-inch (51 mm) nominal lumber.
  2. Two thicknesses of 1-inch (25 mm) nominal lumber with broken lap joints.
  3. One thickness of 0.719-inch (18.3 mm) wood structural panels with joints backed by 0.719-inch (18.3 mm) wood structural panels.
  4. One thickness of 0.75-inch (19.1 mm) particleboard with joints backed by 0.75-inch (19 mm) particleboard.
  5. One-half-inch (12.7 mm) gypsum board.
  6. One-fourth-inch (6.4 mm) cement-based millboard.
  7. Batts or blankets of mineral wool, mineral fiber or other approved materials installed in such a manner as to be securely retained in place.
  8. Cellulose insulation installed as tested for the specific application.
  9. Mass timber complying with Section P2304.11.

AP106.3 Calculated Fire Resistance

AMENDMENT
This section has been amended at the state or city level.
Sections P722.7 through P722.7.2.2 are added to Section 722 of the Building Code.

P722.7 Fire-resistance rating of mass timber. The required fire resistance of mass timber elements in Section P602.4 shall be determined in accordance with Section 703.2 or 703.3 of the Building Code. The fire-resistance rating of building elements shall be as required in Tables P601 and P602 and as specified elsewhere in this code. The fire-resistance rating of the mass timber elements shall consist of the fire resistance of the unprotected element added to the protection time of the noncombustible protection.

P722.7.1 Minimum required protection. Where required by Sections P602.4.1 through P602.4.3, noncombustible protection shall be provided for mass timber building elements in accordance with Table P722.7.1(1). The rating, in minutes, contributed by the noncombustible protection of mass timber building elements, components or assemblies shall be established in accordance with Section P703.8. The protection contributions indicated in Table P722.7.1(2) shall be deemed to comply with this requirement where installed and fastened in accordance with Section P722.7.2.

TABLE P722.7.1(1)
PROTECTION REQUIRED FROM NONCOMBUSTIBLE COVERING MATERIAL
REQUIRED FIRE-RESISTANCE
RATING OF BUILDING
ELEMENT PER
TABLES 601 AND 602
(hours)
MINIMUM PROTECTION
REQUIRED FROM
NONCOMBUSTIBLE
PROTECTION
(minutes)
1 40
2 80
3 or more 120


TABLE P722.7.1(2)
PROTECTION REQUIRED FROM NONCOMBUSTIBLE COVERING MATERIAL
NONCOMBUSTIBLE PROTECTION PROTECTION CONTRIBUTION
(minutes)
1/2-inch Type X gypsum board 25
5/8-inch Type X gypsum board 40


P722.7.2 Installation of gypsum board noncombustible protection. Gypsum board complying with Table P722.7.1(2) shall be installed in accordance with this section.

P722.7.2.1 Interior surfaces. Layers of Type X gypsum board serving as noncombustible protection for interior surfaces of wall and ceiling assemblies determined in accordance with Table P722.7.1(1) shall be installed in accordance with the following:
  1. Each layer shall be attached with Type S dry-wall screws of sufficient length to penetrate the mass timber at least 1 inch when driven flush with the paper surface of the gypsum board.
    Exception: The third layer, where determined necessary by Section P722.7, shall be permitted to be attached with 1-inch #6 Type S drywall screws to furring channels in accordance with ASTM C645.
  2. Screws for attaching the base layer shall be 12 inches on center in both directions.
  3. Screws for each layer after the base layer shall be 12 inches on center in both directions and offset from the screws of the previous layers by 4 inches in both directions.
  4. All panel edges of any layer shall be offset 18 inches from those of the previous layer.
  5. All panel edges shall be attached with screws sized and offset as in Items 1 through 4 and placed at least 1 inch but not more than 2 inches from the panel edge.
  6. All panels installed at wall-to-ceiling intersections shall be installed such that ceiling panels are installed first and the wall panels are installed after the ceiling panel has been installed and is fitted tight to the ceiling panel. Where multiple layers are required, each layer shall repeat this process.
  7. All panels installed at a wall-to-wall intersection shall be installed such that the panels covering an exterior wall or a wall with a greater fire-resistance rating shall be installed first and the panels covering the other wall shall be fitted tight to the panel covering the first wall. Where multiple layers are required, each layer shall repeat this process.
  8. Panel edges of the face layer shall be taped and finished with joint compound. Fastener heads shall be covered with joint compound.
  9. Panel edges protecting mass timber elements adjacent to unprotected mass timber elements in accordance with Section P602.4.2.2 shall be covered with 11/4-inch metal corner bead and finished with joint compound.
P722.7.2.2 Exterior surfaces. Layers of Type X gypsum board serving as noncombustible protection for the outside of the exterior heavy timber walls determined in accordance with Table P722.7.1(1) shall be fastened 12 inches on center each way and 6 inches on center at all joints or ends. All panel edges shall be attached with fasteners located at least 1 inch but not more than 2 inches from the panel edge. Fasteners shall comply with one of the following:
  1. Galvanized nails of minimum 12 gauge with a 7/16-inch head of sufficient length to penetrate the mass timber a minimum of 1 inch.
  2. Screws that comply with ASTM C1002 (Type S, Type W or Type G) of sufficient length to penetrate the mass timber a minimum of 1 inch.

Section AP107 Interior Finishes

AMENDMENT
This section has been amended at the state or city level.

AP107.1 Wall and Ceiling Finishes

AMENDMENT
This section has been amended at the state or city level.
Section P803.3 replaces Section 803.3 of the Building Code.

P803.3 Heavy timber exemption. Exposed portions of building elements complying with the requirements for buildings of heavy timber construction in Section P602.4 or P2304.11 shall not be subject to interior finish requirements except in interior exit stairways, interior exit ramps and exit passageways.
Section P803.15.3 replaces Section 803.15.3 of the Building Code.

P803.15.3 Heavy timber construction. Wall and ceiling finishes of all classes as permitted in this chapter that are installed directly against the wood decking or planking of heavy timber construction in Section P602.4 or P2304.11 or to wood furring strips applied directly to the wood decking or planking shall be fireblocked as specified in Section 803.15.1.1 of the Building Code.

Section AP108 Roof Assemblies and Rooftop Structures

AMENDMENT
This section has been amended at the state or city level.

AP108.1 Rooftop Structures

AMENDMENT
This section has been amended at the state or city level.
Section P1510.2.4 replaces Section 1510.2.4 of the Building Code.

P1510.2.4 Type of construction. Penthouses shall be constructed with walls, floors and roofs as required for the type of construction of the building on which such penthouses are built.
Exception: On buildings of Type III, IV or V construction, the exterior walls of penthouses with a fire separation distance greater than 5 feet (1524 mm) and less than 20 feet (6096 mm) shall be permitted to have not less than a 1-hour fire-resistance rating or a lesser fire-resistance rating as required by Table P602. On buildings of Type III, IV or VA construction, the exterior walls of penthouses with a fire separation distance of 20 feet (6096 mm) or greater shall be permitted to be of heavy timber construction complying with Sections P602.4 and P2304.11 or noncombustible construction or fire-retardant-treated wood and shall not be required to have a fire-resistance rating.

Section AP109 Special Inspections and Tests

AMENDMENT
This section has been amended at the state or city level.

AP109.1 Required Special Inspections and Tests

AMENDMENT
This section has been amended at the state or city level.
Section P1705.5.3 and Section P1705.20 are added to Section 1705 of the Building Code.

P1705.5.3 Mass timber construction. Special inspections of mass timber elements in Type IVA, IVB and IVC construction shall be in accordance with Table P1705.5.3.

TABLE P1705.5.3
REQUIRED SPECIAL INSPECTIONS OF MASS TIMBER CONSTRUCTION
TYPE CONTINUOUS
SPECIAL
INSPECTION
PERIODIC
SPECIAL
INSPECTION
1. Inspection of anchorage and connections of mass timber construction to timber deep foundation systems. X
2. Inspect erection of mass timber construction. X
3. Inspection of connections where installation methods are required to meet design loads.
3.1. Threaded fasteners
3.1.1. Verify use of proper installation equipment. X
3.1.2. Verify use of predrilled holes where required. X
3.1.3. Inspection screws, including diameter, length, head type, spacing, installation angle and depth. X
3.2. Adhesive anchors installed in horizontal or upwardly inclined orientation to resist sustained tension loads. X
3.3 Adhesive anchors not defined in 3.2. X
3.4. Bolted connections. X
3.5. Concealed connections. X


P1705.20 Sealing of mass timber. Periodic special inspections of sealants or adhesives shall be conducted where sealant or adhesive required by Section P703.9 is applied to mass timber building elements as designated in the approved construction documents.

Section AP110 Wood

AMENDMENT
This section has been amended at the state or city level.

AP110.1 Minimum Standards and Quality

AMENDMENT
This section has been amended at the state or city level.
Section P2303.1.14 is added to Section 2303.1 of the Building Code.

P2303.1.14 Structural glued cross-laminated timber minimum standards and quality. Cross-laminated timber shall be manufactured and identified in accordance with ANSI/APA PRG 320.

AP110.2 Minimum Standards and Quality

AMENDMENT
This section has been amended at the state or city level.
Section P2304.11 replaces Sections 2304.11 through 2304.11.7 of the Building Code.

P2304.11 Heavy timber construction. Where a structure, portion thereof or individual structural elements are required by provisions of this code to be of heavy timber, the building elements therein shall comply with the applicable provisions of Sections P2304.11.1 through P2304.11.5.2. Minimum dimensions of heavy timber shall comply with the applicable requirements in Table P2304.11 based on roofs or floors supported and the configuration of each structural element, or in Sections P2304.11.2 through P2304.11.4. Lumber decking shall be in accordance with Section 2304.9 of the Building Code, and connections shall be in accordance with Section P2304.11.1 of this appendix.

TABLE P2304.11
MINIMUM DIMENSIONS OF HEAVY TIMBER STRUCTURAL MEMBERS
SUPPORTING HEAVY TIMBER
STRUCTURAL ELEMENTS
MINIMUM NOMINAL
SOLID SAWN SIZE
MINIMUM GLUED-LAMINATED
NET SIZE
MINIMUM STRUCTURAL COMPOSITE LUMBER NET SIZE
Width, inch Depth, inch Width, inch Depth, inch Width, inch Depth, inch
Floor loads only or combined floor and roof loads Columns
Framed sawn or glued-laminated timber arches that spring from the floor line
Framed timber trusses
8 8 63/4 81/4 7 71/2
Wood beams and girders 6 10 5 101/2 51/4 91/2
Roof loads only Columns (roof and ceiling loads)
Lower half of: wood-frame or glued-laminated arches that spring from the floor line or from grade
6 8 5 81/4 51/4 71/2
Upper half of: wood-frame or glued-laminated arches that spring from the floor line or from grade 6 6 5 6 51/4 51/2
Framed timber trusses and other roof framinga
Framed or glued-laminated arches that spring from the top of walls or wall abutments
4b 6 3b 67/8 31/2b 51/2
For SI: 1 inch = 25.4 mm.
  1. Spaced members shall be permitted to be composed of two or more pieces not less than 3 inches nominal in thickness where blocked solidly throughout their intervening spaces or where spaces are tightly closed by a continuous wood cover plate of not less than 2 inches nominal in thickness secured to the underside of the members. Splice plates shall be not less than 3 inches nominal in thickness.
  2. Where protected by approved automatic sprinklers under the roof deck, framing members shall be not less than 3 inches nominal in width.
P2304.11.1 Connection fire-resistance rating. Fire-resistance ratings for connections in Type IVA, IVB or IVC construction shall be determined by one of the following methods:
  1. Testing in accordance with Section 703.2 of the Building Code where the connection is part of the fire-resistance test.
  2. Engineering analysis demonstrating that the temperature rise at any portion of the connection is limited to an average temperature rise of 250°F (139°C), and a maximum temperature rise of 325°F (181°C), for a time corresponding to the required fire-resistance rating of the structural element being connected. For the purposes of this analysis, the connection includes connectors, fasteners and portions of wood members included in the structural design of the connection.
P2304.11.2 Details of heavy timber structural members. Heavy timber structural members shall be detailed and constructed in accordance with Sections P2304.11.2.1 through P2304.11.2.3.

P2304.11.2.1 Columns. Minimum dimensions of columns shall be in accordance with Table P2304.11. Columns shall be continuous or super-imposed throughout all stories and connected in an approved manner. Girders and beams at column connections shall be closely fitted around columns and adjoining ends shall be cross tied to each other, or intertied by caps or ties, to transfer horizontal loads across joints. Wood bolsters shall not be placed on tops of columns unless the columns support roof loads only. Where traditional heavy timber detailing is used, connections shall be by means of reinforced concrete or metal caps with brackets, by properly designed steel or iron caps, with pintles and base plates, by timber splice plates affixed to the columns by metal connectors housed within the contact faces, or by other approved methods.

P2304.11.2.2 Floor framing. Minimum dimensions of floor framing shall be in accordance with Table P2304.11. Approved wall plate boxes or hangers shall be provided where wood beams, girders or trusses rest on masonry or concrete walls. Where intermediate beams are used to support a floor, they shall rest on top of girders or shall be supported by an approved metal hanger into which the ends of the beams shall be closely fitted. Where traditional heavy timber detailing is used, these connections shall be permitted to be supported by ledgers or blocks securely fastened to the sides of the girders.

P2304.11.2.3 Roof framing. Minimum dimensions of roof framing shall be in accordance with Table P2304.11. Every roof girder and not less than every alternate roof beam shall be anchored to its supporting member to resist forces as required in Chapter 16 of the Building Code.

P2304.11.3 Partitions and walls. Partitions and walls shall comply with Section P2304.11.3.1 or P2304.11.3.2.

P2304.11.3.1 Exterior walls. Exterior walls shall be permitted to be cross-laminated timber meeting the requirements of Section 2303.1.4 of the Building Code.

P2304.11.3.2 Interior walls and partitions. Interior walls and partitions shall be of solid wood construction formed by not less than two layers of 1-inch (25 mm) matched boards or laminated construction 4 inches (102 mm) thick, or of 1-hour fire-resistance-rated construction.

P2304.11.4 Floors. Floors shall be without concealed spaces. Wood floors shall be constructed in accordance with Section P2304.11.4.1 or P2304.11.4.2.

P2304.11.4.1 Cross-laminated timber floors. Cross-laminated timber shall be not less than 4 inches (102 mm) in actual thickness. Cross-laminated timber shall be continuous from support to support and mechanically fastened to one another. Cross-laminated timber shall be permitted to be connected to walls without a shrinkage gap provided that swelling or shrinking is considered in the design. Corbelling of masonry walls under the floor shall be permitted to be used.

P2304.11.4.2 Sawn or glued-laminated plank floors. Sawn or glued-laminated plank floors shall be one of the following:
  1. Sawn or glued-laminated planks, splined or tongue-and-groove of not less than 3 inches (76 mm) nominal in thickness covered with 1-inch (25 mm) nominal dimension tongue-and-groove flooring, laid crosswise or diagonally, or 15/32-inch (12 mm) wood structural panel or 1/2-inch (12.7 mm) particleboard.
  2. Planks not less than 4 inches (102 mm) nominal in width set on edge close together and well spiked and covered with 1-inch (25 mm) nominal dimension flooring or 15/32-inch (12 mm) wood structural panel or 1/2-inch (12.7 mm) particleboard. The lumber shall be laid so that continuous lines of joints will occur only at points of support. Floors shall not extend closer than 1/2 inch (12.7 mm) to walls. Such 1/2-inch (12.7 mm) space shall be covered by a molding fastened to the wall and so arranged that it will not obstruct the swelling or shrinkage movements of the floor. Corbelling of masonry walls under the floor shall be permitted to be used in place of molding.
P2304.11.5 Roof decks. Roofs shall be without concealed spaces and roof decks shall be constructed in accordance with Section P2304.11.5.1 or P2304.11.5.2. Other types of decking shall be an alternative that provides equivalent fire resistance and structural properties. Where supported by a wall, roof decks shall be anchored to walls to resist forces determined in accordance with Chapter 16 of the Building Code. Such anchors shall consist of steel bolts, lags, screws or approved hardware of sufficient strength to resist prescribed forces.

P2304.11.5.1 Cross-laminated timber roofs. Cross-laminated timber roofs shall be not less than 3 inches (76 mm) nominal in thickness and shall be continuous from support to support and mechanically fastened to one another.

P2304.11.5.2 Sawn, wood structural panel or glued-laminated plank roofs. Sawn, wood structural panel or glued-laminated plank roofs shall be one of the following:
  1. Sawn or glued-laminated, splined or tongue-and-groove plank not less than 2 inches (51 mm) nominal in thickness.
  2. 1/8-inch-thick (32 mm) wood structural panel (exterior glue).
  3. Planks not less than 3 inches (76 mm) nominal in width, set on edge close together and laid as required for floors.

Section AP111 Plastic

AMENDMENT
This section has been amended at the state or city level.

AP111.1 Foam Plastic Insulation

AMENDMENT
This section has been amended at the state or city level.
Section P2603.4 replaces Section 2603.4 of the Building Code.

P2603.4 Thermal barrier. Except as provided for in Sections 2603.4.1 and 2603.9 of the Building Code, foam plastic shall be separated from the interior of a building by an approved thermal barrier of 1/2-inch (12.7 mm) gypsum wallboard, heavy timber in accordance with Section P602.4, or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275. Combustible concealed spaces shall comply with Section 718 of the Building Code.

Section AP112 Referenced Standards

AMENDMENT
This section has been amended at the state or city level.
ANSI/APA PRG 320—18 Standard for Performancerated Cross-laminated Timber P2303.1.12
ASTM D3498—03 Standard Specification for Adhesives for Field-gluing Plywood to Lumber Framing for Floor Systems P703.9
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