ASD/LRFD Manual - American Wood Council

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ASD/LRFD MANUAL FOR ENGINEERED Wood Construction 103 Lumber Building Code Requirements For occupancies such as stores, apartments, offices, and other commercial and industrial uses, building codes commonly require floor/ceiling and wall assemblies to be fire-resistance rated in accordance with standard fire tests. Depending on the application, wall assemblies may need to be rated either from one side or both sides. For specific exterior wall applications, the International Building Code (IBC) allows wood-frame, wood-sided walls to be tested for exposure to fire from the inside only. Rating for both interior and exterior exposure is only required when the wall has a fire separation distance of less than 5 feet. Code recognition of 1- and 2-hour wood-frame wall systems is also predicated on successful fire and hose stream testing in accordance with ASTM E119, Standard Test Methods for Fire Tests of Building Construction Materials. Fire Tested Assemblies Fire-rated wood-frame assemblies can be found in a number of sources including the IBC, Underwriters Laboratories (UL) Fire Resistance Directory, Intertek Testing Services’ Directory of Listed Products, and the Gypsum Association’s Fire Resistance Design Manual. The American Forest & Paper Association (AF&PA) and its members have tested a number of wood-frame fire-rated assemblies. Descriptions of these successfully tested assemblies are provided in Tables M16.1-2 through M16.1-5. Updates Additional tests are being conducted and the Tables will be updated periodically. AF&PA’s Design for Code Acceptance (DCA) No. 3, Fire Rated Wood Floor and Wall Assemblies incorporates many of these assemblies and is available at www.awc.org. Table M16.1-2 One-Hour Fire-Rated Load-Bearing Wood-Frame Wall Assemblies Assemblies Rated From Both Sides Studs Insulation Sheathing on Both Sides Fasteners Details 2x4 @ 16" o.c. 3½" mineral wool batts 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 12" o.c. Figure M16.1-1 2x6 @ 16" o.c. (none) 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 7" o.c. Figure M16.1-2 2x6 @ 16" o.c. 5½" mineral wool batts 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 12" o.c. Figure M16.1-3 2x6 @ 16" o.c. R-19 fiberglass insulation 5/8" Type X Gypsum Wallboard (V) 2¼" #6 Type S drywall screws @ 12" o.c. Figure M16.1-4 Assemblies Rated From One Side (Fire on Interior Only) Studs Insulation Sheathing Fasteners Details 2x4 @ 16" o.c. 3½" mineral wool batts I 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 12" o.c. E 3/8" wood structural panels (V) 6d common nails @ 6" edges/12" field Figure M16.1-5 I 5/8" Type X Gypsum Wallboard (V) 6d cement coated box nails @ 7" o.c. 4 mil polyethylene 2x4 @ 16" o.c. ½" fiberboard (V) 1½" roofing nails @ 3" edges/6" field Figure M16.1-6 3½" mineral wool batts E 3/8" hardboard shiplapped panel siding 8d galv. nails @ 4" edges/8" field 2x6 @ 16" o.c. 5½" mineral wool batts I 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 12" o.c. E 7/16" wood structural panels (V) 6d common nails @ 6" edges/12" field Figure M16.1-7 2x6 @ 16" o.c. R-19 fiberglass insulation I 5/8" Type X Gypsum Wallboard (V) 2¼" #6 Type S drywall screws @ 12" o.c. E 3/8" wood structural panels (V) 6d common nails @ 6" edges/12" field Figure M16.1-8 H- applied horizontally with vertical joints over studs; I- Interior sheathing; V- applied vertically with vertical joints over studs; E- Exterior sheathing M16: FIRE DESIGN Table M16.1-3 Two-Hour Fire-Rated Load-Bearing Wood-Frame Wall Assemblies Assemblies Rated From Both Sides Studs Insulation Sheathing on Both Sides Fasteners Details B 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 24" o.c. 2x4 @ 24" o.c. 5½" mineral wool batts Figure M16.1-9 F 5/8" Type X Gypsum Wallboard (H) 2¼" #6 Type S drywall screws @ 8" o.c. 16 H- applied horizontally with vertical joints over studs; B- Base layer sheathing: F- Face layer sheathing American Forest & paper association
104 M16: FIRE DESIGN Table M16.1-4 One-Hour Fire-Rated Wood Floor/Ceiling Assemblies Joists Insulation Furring Ceiling Sheathing Floor Sheathing Details 2x10 @ 16" o.c. none Optional F 2x10 @ 16" o.c. none (none) F 2x10 @ 16" o.c. none 2x10 @ 24" o.c. none F- Face layer sheat Resilient channels Resilient channels F F 5/8" Type X Gypsum Wallboard or ½" Type X Gypsum Wallboard ½" x 24" x 48" mineral acoustical ceiling panels (see grid details) 5/8" Type X Gypsum Wallboard or ½" proprietary Type Gypsum Wallboard 5/8" proprietary Type Gypsum Wallboard Nom. 1" wood flooring or 19/32" T&G plywood* underlayment (single floor); building paper, and Nom. 1" T&G boards or 15/32" plywood* subfloor Nom. 19/32" T&G plywood* underlayment (single floor); building paper, and 15/32" plywood* subfloor Nom. 19/32" T&G plywood* underlayment (single floor) or 15/32" plywood* subfloor Nom. 23/32" T&G plywood* underlayment (single floor) or 15/32" plywood* subfloor Figure M16.1-10 Figure M16.1-11 Figure M16.1-12 Figure M16.1-13 Table M16.1-5 Two-Hour Fire-Rated Wood Floor/Ceiling Assemblies Joists Insulation Furring Ceiling Sheathing Floor Sheathing Details 2x10 @ 16" o.c. none (none) B Resilient channels F 5/8" proprietary Type X Gypsum Wallboard 5/8" proprietary Type X Gypsum Wallboard Nom. 1" wood flooring or 19/32" T&G plywood* underlayment (single floor); building paper, and Nom. 1" T&G boards or 15/32" plywood* subfloor Figure M16.1-14 B- Base layer sheathing (direct attached); F- Face layer sheathing; *Oriented strand board (OSB) panels are permitted for certain designs. Subfloors for certain designs may be nom. 7/16" OSB. American Wood Council
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2005 EDITION ASD/LRFD MANUAL MANUAL
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Updates and Errata While every prec
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ii ASD/LRFD MANUAL FOR ENGINEERED W
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iv ASD/LRFD MANUAL FOR ENGINEERED W
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vi ASD/LRFD MANUAL FOR ENGINEERED W
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viii ASD/LRFD MANUAL FOR ENGINEERED
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ASD/LRFD MANUAL FOR ENGINEERED Wood
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M1: general requirements for struct
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M2: DESIGN VALUES FOR STRUCTURAL ME
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M3: Design Provisions and Equations
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M3: Design Provisions and Equations
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10 M3: Design Provisions and Equati
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12 M4: SAWN LUMBER M4.1 General Pro
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14 M4: SAWN LUMBER M4.4 Special Des
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16 M4: SAWN LUMBER Table M4.4-3 Coe
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18 M4: SAWN LUMBER Table M4.5-1a AS
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20 M4: SAWN LUMBER Table M4.5-2b AS
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22 M4: SAWN LUMBER Table M4.5-3a AS
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24 M4: SAWN LUMBER Table M4.5-4c AS
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26 M4: SAWN LUMBER Column Capacity
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28 M5: structural glued laminated t
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34 M6: ROUND TIMBER POLES AND PILES
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36 M6: ROUND TIMBER POLES AND PILES
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38 M7: PREFABRICATED WOOD I-JOISTS
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154 M16: FIRE DESIGN Table M16.2-8
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156 M16: FIRE DESIGN Example 16.2-1
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158 M16: FIRE DESIGN For the fire d
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160 M16: FIRE DESIGN Figure M16.3-5
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American Forest & Paper Association
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