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• <br /> �MyBuildingPermit.com <br /> a service of eCityGov.net Construction Tip Sheet 05 <br /> When using the tables below, interpolation is allowed, extrapolation is not allowed. <br /> Sizing of Structural Elements <br /> Maximum Deck Joist Span a,c <br /> Joist Spacing b <br /> Joist (inches) Joist Back Span <br /> Size 12 16 24 4 6 8 10 12 14 16 18 <br /> Allowable Joist Span Maximum Cantilever (feet-inches) Adjacent Joist Span (feet) <br /> 2x6 7-11 7-1 5-9 1-0 1-6 NP NP NP NP NP NP <br /> _ 2x8 10-5 9-5 7-8 1-0 1-6 _ 2-0 2-1 NP NP NP NP <br /> 2x10 13-3 11-6 9-5 1-0 1-6 2-0 2-6 2-8 NP NP NP <br /> 2x12 15-5 13-4 10-11 1-0 1-6 2-0 2-6 3-0 3-3 NP NP <br /> a. Includes Incising Factor. <br /> b. When using composite decking, refer to manufacturer's installation instructions for <br /> maximum spacing of joists. <br /> c. Spans based on Doug Fir-Larch, Hem Fir and Spruce-Pine-Fir, No. 2 grade, wet service <br /> factor. <br /> Minimum Beam Size <br /> Deck Joist Span (feet) <br /> 6 8 10 12 I 14 16 18 <br /> Beam Maximum Beam Span a,b,d(feet-inches) <br /> Size c,d,e <br /> 4x6 5-2 4-6 4-0 3-5 3-1 2-10 2-7 <br /> 4x8 6-11 6-0 5-3 4-7 4-1 3-8 3-5 <br /> 4x10 8-5 7-4 6-6 5-10 5-2 4-9 4-5 <br /> 4x12 9-10 8-6 7-7 6-11 6-4 5-9 5-4 <br /> 6x6 6-6 5-7 5-0 4-7 4-2 3-9 3-5 <br /> 6x8 8-8 7-6 6-8 6-1 5-6 5-0 4-7 <br /> 6x10 10-7 9-2 8-2 7-6 6-11 6-4 5-10 <br /> 6x12 12-4 10-8 9-7 8-9 8-1 7-7 7-1 <br /> a. Spans based on Doug Fir-Larch, Hem Fir and Spruce-Pine-Fir, No. 2 grade, wet service <br /> factor. <br /> b. If 2x built up beams to make 4x or 6x beams, they shall be fastened with two rows of 10d <br /> (3-inch x 0.128-inch) nails minimum at 16 inches on center along each edge (507.5) <br /> c. Beam depth shall be equal to or greater than the depth of intersecting joist for a flush <br /> beam connection. <br /> d. Beam cantilevers are limited to the adjacent beam's span divided by 4. <br /> e. Includes incising factor. <br /> January 14, 2022 MyBuildingPermit.com I Basic Deck <br /> cCityGov net <br /> 2P,C5 eCif,'GcvAIarte <br />