Beam Round Square Joist Footing Span LB, Footing Footing Span L ft Thickness2 ft Diameter Dimension 10' 13" 11" 6" ≤ 6' 14' 15" 13" 6" ≤ 18' 17" 15" 7" ≤ 10' 15" 13" 6" ≤ 8' 14' 18" 16" 7" ≤ 18' 20" 18" 8" ≤ 10' 17" 15" 6" ≤ 10' 14' 20" 17" 8" ≤ 18' 22" 20" 9" ≤ 10' 18" 16" 7" ≤ 12' 14' 21" 19" 9" ≤ 18' 24" 22" 10" ≤ 10' 20" 17" 8" ≤ 14' 14' 23" 21" 9" ≤ 18' 26" 23" 11" ≤ 10' 21" 19" 8" ≤ 16' 14' 25" 22" 10" ≤ 18' 28" 25" 12" ≤ 10' 22" 20" 9" ≤ 18' 14' 26" 23" 11" ≤ 18' 30" 26" 13" ≤ 1. Assumes 2,000 psf soil bearing capacity. 2. Assumes 2,500 psi compressive strength of concrete. LEDGER BOARD ATTACHMENT General requirements Ledger board depth shall be greater than or equal to the depth of the deck joists, but not less than a 2x8.
Beam Span LB, ft Joist Span L ft Round Footing Diameter Square Footing Dimension Footing Thickness2 6' ≤ 10' 13" 11" 6" ≤ 14' 15" 13" 6" ≤ 18' 17" 15" 7" 8' ≤ 10' 15" 13" 6" ≤ 14' 18" 16" 7" ≤ 18' 20" 18" 8" 10' ≤ 10' 17" 15" 6" ≤ 14' 20" 17" 8" ≤ 18' 22" 20" 9" 12' ≤ 10' 18" 16" 7" ≤ 14' 21" 19" 9" ≤ 18' 24" 22" 10" 14' ≤ 10' 20" 17" 8" ≤ 14' 23" 21" 9" ≤ 18' 26" 23" 11" 16' ≤ 10' 21" 19" 8" ≤ 14' 25" 22" 10" ≤ 18' 28" 25" 12" 18' ≤ 10' 22" 20" 9" ≤ 14' 26" 23" 11" ≤ 18' 30" 26" 13" 1. Assumes 2,000 psf soil bearing capacity. 2. Assumes 2,500 psi compressive strength of concrete. LEDGER BOARD ATTACHMENT General requirements Ledger board depth shall be greater than or equal to the depth of the deck joists, but not less than a 2x8.
Residential_Wood_Deck_Construction_Guide.docx