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6 PRESCRIPTIVE RESIDENTIAL WOOD DECK CONSTRUCTION GUIDE <br /> Table 3A. Dimension Lumber Deck Beam Spans (Ls)1 for Joists Framing from One Side Only, <br /> Joist Spans (L) Less Than or Equal to: <br /> Species Size4 6' 8' 10' 12' 14' 16' 18' <br /> 2-2x6 6' - 8" 5' - 8" 5' - 1" 4' - 7" 4' -3" 4' -0" 3'-9" <br /> 2-2x8 8' -6" 7' -4" 6'-6" 5'- 11" 5' -6" 5' - 1" 4'-9" <br /> .2-2x10 10' - 1" 8' -9 7' -9" 7' - 1" 6' -6" 6' - 1" 5' -9" <br /> Southern Pine <br /> 2-2x12 11' - 11" 10' -4" 9' -2" 8' -4 7' -9" 7' -3" 6' -9" <br /> 3-2x6 7'- 11" 7' - 2" 6'- 5" 5'- 10" 5' -5" 5' -0" 4'-9" <br /> 3-2x8 10' - 7" 9' -3" 8' - 3" 7' -6" 6' - 11" 6' -5" 6' - 1" <br /> 3-2x10 12' -9" 11' - 0" 9' - 9" 8' -9" 8' -3" 7' - 8" 7' -3" <br /> 3-2x12 15' -0" 13' - 0" 11' -7" 10' -6" 9' - 9" 9' - 1" 8' -7" <br /> 3x6 or 2-2x6 5' -2" 4' -5" 3' - 11" 3' -7" 3' -3" 2' - 10" 2' -6" <br /> 3x8 or 2-2x8 6' - 7" 5' - 8" 5' - 1" 4' - 7" 4' - 3" 3' - 10" 3' - 5" <br /> Douglas Fir- 3x10 or 2-2x10 8' - 1" 7' -0" 6' -3" 5' - 8" 5' - 3" 4' - 10" 4' -5" <br /> Larch2, Hem- 3x12 or 2-2x12 9' -5" 8' -2" 7' -3" 6' - 7" 6' - 1" 5' - 8" 5' -4" <br /> Fire, Spruce- <br /> 4x6 6' - 2" 5' - 3" 4' - 8" 4' -3" 3' - 11" 3' -8" 3' - 5" <br /> Pine-Pira, <br /> Redwood, 4x8 8' -2" 7' -0" 6' - 3" 5' - 8" 5' -3" 4' - 11 4' - 7" <br /> Western 4x10 9' - 8" 8' -4" 7' - 5" 6' -9" 6'-3" 5' - 10" 5' - 5" <br /> Cedars, 4x12 11' -2" 9'- 8" 8' - 7" 7' - 10" 7' -3" 6' - 9" 6' -4" <br /> Ponderosa <br /> Pine3, Red 3-2x6 7' - 1" 6'-5" 5' -9" 5'-3" 4' - 10" 4' -6" 4' -3" <br /> Pine3 3-2x8 9'-5" 8'- 3" 7' -4" 6'- 8" 6' -2" 5' -9" 5' - 5" <br /> 3-2x10 11' -9" 10' -2" 9' - 1" 8' -3" 7' - 7" 7' - 1" 6' - 8" <br /> 3-2x12 13' -8" 11' - 10" 10' -6 9' -7" 8' - 10" 8' - 3" 7' - 10" <br /> 1.Assumes 40 psf live load,10 psf dead load, L/360 simple span beam deflection limit,cantilever length/180 deflection limit,No.2 stress <br /> grade,and wet service conditions. <br /> • 2. Incising assumed for Douglas fir-larch,hem-fir,and spruce-pine-fir. <br /> 3. Design values based on northern species with no incising assumed. <br /> 4. Beam depth must be equal to or greater than joist depth if joist hangers are used(see Figure 6,Option 3). <br /> Jv <br /> • <br /> • <br /> American Wood Council <br />