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DECK JOIST SPANa, <br /> (feet) <br /> BEAM SPECIESd BEAM SIZE° 6 8 10 12 14 16 18 <br /> MAXIMUM BEAM SPANa,b,f <br /> (feet-inches) <br /> 1—2 x 6 3-5 2-10 2-5 2-2 2-0 1-10 1-9 <br /> 1—2 x 8 4-7 3-8 3-2 2-10 2-7 2-5 2-4 <br /> 1-2 x 10 5-8 4-9 4-1 3-8 3-4 3-1 2-11 <br /> 1—2 x 12 6-7 5-8 5-0 4-6 4-1 3-10 3-7 <br /> 2-2 x 6 5-2 4-6 4-0 3-5 3-1 2-10 2-7 <br /> 2—2 a 8 6-11 6-0 5-3 4-7 4-1 3-8 3-5 <br /> Douglas fir-larch9, <br /> Spruce-pine-fir9 2—2 x 10 8-5 7-4 6-6 5-10 5-2 4-9 4-5 <br /> 2-2 a 12 9-10 8-6 7-7 6-11 6-4 5-9 54 <br /> 3-2 x 6 6-6 5-7 5-0 4-7 4-2 3-9 3-5 <br /> 3—2 x 8 8-8 7-6 6-8 6-1 5-6 5-0 4-7 <br /> 3-2 x 10 10-7 9-2 8-2 7-6 6-11 6-4 5-10 <br /> 3—2 x 12 12-4 10-8 9-7 8-9 8-1 7-7 7-1 <br /> 1—2 x 6 3-6 2-11 2-6 2-3 2-0 1-11 1-9 <br /> 1—2 a 8 4-6 3-10 3-3 2-11 2-8 2-6 2-4 <br /> 1—2 a 10 5-6 4-9 4-2 3-9 3-5 3-2 3-0 <br /> 1—2 x 12 6-4 5-6 4-11 4-6 4-2 3-11 3-8 <br /> 2-2 x 6 5-3 4-7 4-1 3-6 3-2 2-11 2-8 <br /> Redwoodh,Western 2-2 x 8 6-8 5-9 5-2 4-8 4-2 3-10 3-6 <br /> Cedarsh,Ponderosa Pineh, <br /> Red Pineh 2-2 a 10 8-2 7-1 6-4 5-9 5-4 4-10 4-6 <br /> 2-2 x 12 9-5 8-2 7-4 6-8 6-2 5-9 5-5 <br /> 3=2 x 6 6-4 5-8 5-1 4-8 4-3 3-10 3-6. <br /> 3—2 x 8 8-4 7-3 6-5 5-11 5-5 5-1 4-8 <br /> 3-2 x 10 10-2 8-2 7-11 7-2 6-8 6-3 5-11 <br /> 3-2 a 12 11-10 10-3 9-2 8-4 7-9 7-3 7 <br /> For SI:1 inch=25.4 mm, 1 foot=304.8 mm,1 pound per square foot=0.0479 kPa,1 pound=0.454 kg. <br /> a Interpolation allowed.Extrapolation is not allowed. <br /> b.Beams supporting a single span of joists with or without cantilever. <br /> a Dead load=10 psf,L/A=360 at main span,ULt=180 at cantilever Snow load not assumed to be concurrent with live load. <br /> d.No.2 grade,wet service factor included. <br />