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A6 Prescriptive Residential Wood Deck Construction Guide -Appendix Table B3. Footing Sizes' Based on Tributary Area for Various Soil Capacities. Soil Bearing Capacity 1500 psf 2000 psf 2500 psf 3000 psf us cvw- a c -. co c c cd c c c c c c c c ` 4 -.- 46 =. o o+ a• o ,, 0 Q 1- O rc - o c N - o .. c y go m c E i v 8c vm LL ,C c E � ... LL yL c ; a " LL ac c E � ac A O Al O V = t0 O t� O O O V = t0 O U c Oo er :c ala a .c O ,- a .0 0 a s I- Ir U) I- CC Cl) I- CC U) I-- CC co F- 10 8 7 6 7 7 6 7 6 6 6 5 6 20 12 10 6 10 9 6 9 8 6 8 7 6 30 14 13 6 12 11 6 11 10 6 10 . 9 6 40 16 15 6 14 13 6 13 11 6 12 10 6 50 18 16 7 16 14 6 14 13 6 13 12 6 60 20 18 8 17 15 6 16 14 6 14 13 6 70 22 19 9 19 17 7 17 15 6 15 14 6 80 23 21 9 20 18 8 18 16 7 16 15 6 90 25 22 10 21 19 8 19 17 7 17 15 6 100 26 23 11 23 20 9 20 18 8 18 16 7 110 28 25 12 24 21 10 21 19 8 19 17 7 120 29 26 12 25 22 10 22 19 9 20 18 8 130 30 27 13 26 23 11 23 20 9 21 18 8 140 31 28 13 27 24 11 24 21 10 22 19 9 150 33 29 14 28 25 12 25 22 10 22 20 9 160 34 30 15 29 25 12 25 23 10 23 20 9 170 35 31 15 30 26 13 26 23 11 24 21 10 180 36 32 16 30 27 13 27 24 11 24 22 10 190 37 33 16 31 28 13 28 25 12 25 22 10 200 38 34 17 32 29 14 28 25 12 26 23 11 210 39 35 17 33 29 14 29 26 12 26 23 11 220 40 35 18 34 30 15 30 26 13 27 24 11 . 230 41 36 18 35 31 15 31 27 13 28 25 12 240 42 37 19 35 31 15 31 28 13 28 25 12 250 43 38 19 36 32 16 32 .28 14 29 26 12 1. Assumes 40 psf live load, 10 psf dead load, 150 pcf concrete and 2,500 psi compressive strength of concrete. Coordinate footing thickness with post base and anchor requirements. 2. Tributary area shall be multiplied by 1.25 at center posts with beams not spliced (continuous). ,,;-A-.-v/ American Wood Council