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Footing Pad Support
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Post Spacing
For 10" Diameter Footing Pads
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Soil Capacity
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| Deck Span |
1500 lbs/sq.ft. |
2000 lbs/sq.ft. |
2500 lbs/sq.ft. |
3000 lbs/sq.ft. |
| 6" |
6'-0" on center |
8'-0" on center |
10'-0" on center |
12'-0" on center |
| 8" |
4'-6" on center |
6'-0" on center |
7'-6" on center |
9'-0" on center |
| 10" |
3'-7" on center |
4'-10" on center |
6'-0" on center |
7'-3" on center |
| 12" |
3'-0" on center |
4'-0" on center |
5'-0" on center |
6'-0" on center |
| 14" |
2'-6" on center |
3'-5" on center |
4'-3" on center |
5'-2" on center |
| 16" |
N/A |
3'-0" on center |
3'-9" on center |
4'-6" on center |
| 18" |
N/A |
2'-8" on center |
3'-3" on center |
4'-0" on center |
| 20" |
N/A |
2'-5" on center |
3'-0" on center |
3'-7" on center |
Soil type and its bearing capacity value determine post spacing. Based on total live and dead loads of 45 pounds per square foot, post spacing for a 12-foot wide deck would be 6 feet on center in average soil with a bearing capacity of 3,000 pounds per square foot. Spacing could be adjusted up or down depending on the soil’s bearing capacity value.
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