Page 189 - 2018_IRC

FLOORS

Thickness (inches) 6 6 6 6 6 6 6 7 6 6 6 6 6 6 7 8 6 6 6 6 6 7 8 9 6 6 6 6 7 8 9 9

≥ 3000 e Diameter of a round footing (inches) 14 14 14 16 17 19 21 22 14 14 15 17 19 21 23 24 14 14 16 19 21 23 24 6 2 14 14 17 20 22 24 6 2 8 2

Side of a square footing (inches) 12 12 12 14 15 17 18 20 12 12 13 15 17 19 20 21 12 12 14 16 18 20 22 3 2 12 12 15 18 20 21 3 2 5 2

Thickness Diameter of a round footing (inches) (inches) 6 14 6 14 6 15 6 17 6 19 6 21 7 23 8 24 6 14 6 14 6 16 6 19 6 21 7 23 8 25 9 27 6 14 6 14 6 18 6 20 7 23 8 25 9 27 0 1 9 2 6 14 6 15 6 19 7 22 8 24 9 27 0 1 9 2 1 1 1 3

2500 e

TABLE R507.3.1 MINIMUM FOOTING SIZE FOR DECKS LOAD BEARING VALUE OF SOILS a, c, d (psf) 2000 e Side of a Diameter of a Thickness square footing round footing (inches) (inches) (inches) 12 6 14 12 6 14 13 6 17 15 6 19 17 6 21 19 7 23 20 8 25 21 9 27 12 6 14 12 6 15 14 6 18 17 6 21 19 7 23 20 8 26 22 9 28 24 10 30 12 6 14 13 6 16 16 6 20 18 7 23 20 8 25 22 9 28 24 10 30 5 2 1 1 12 6 14 14 6

Side of a square footing (inches) 12 12 15 17 19 21 22 24 12 13 16 19 21 23 25 26 12 14 17 20 22 25 27 2 3 8 2 12 15 19 21 24 26 2 3 8 2 4 3 0 3

Thickness (inches) 6 6 6 7 8 9 10 11 6 6 6 8 9 10 11 12 6 6 7 9 10 11 12 3 6 6 8 9 11 12 3 5

Diameter of a round footing (inches) 14 16 19 22 25 27 29 31 14 17 21 24 27 30 32 34 14 19 23 26 29 32 35 1 14 20 24 28 31 34 1 1 If the support is a brick or CMU pier, the footing shall have a minimum 2-inch projection on all sides.
1500 e 7 3 7 3 0 4 1 inch = 25.4 mm, 1 square foot = 0.0929 m 2 , 1 pound per square foot = 0.0479 kPa. Assumes minimum square footing to be 12 inches x 12 inches x 6 inches for 6 x 6 post.

Side of a square footing (inches) 12 14 17 20 22 24 26 28 12 15 19 21 24 26 28 30 12 16 20 23 26 28 31 3 3 12 18 21 25 28 30 3 3 5 3 Interpolation permitted, extrapolation not permitted. Based on highest load case: Dead + Live or Dead + Snow. Area, in square feet, of deck surface supported by post and footings.

TRIBUTARY AREA (sq. ft.) 20 40 60 80 100 120 140 160 20 40 60 80 100 120 140 160 20 40 60 80 100 120 140 0 20 40 60 80 100 120 0 0

LIVE OR GROUND SNOW LOAD b (psf) 40 50 60 6 1 70 4 1 6 1 For SI: a. b. c. d. e.

164 2018 INTERNATIONAL RESIDENTIAL CODE ®
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