§870.TABLE B. Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 20 Pounds Per Square Foot

Latest version.

Section Width (feet)
	12	14	16	12	14	16	12	14	16
Support Spacing (feet)
	6	6	6	8	8	8	10	10	10
Support Loading (pounds per pier)
	3200	3700	4250	4250	4950	5650	5300	6150	7050
Soil's Load- Bearing Capacity (lbs/ft²)	Footing Area (square inches)
1000	461	533	612	612	713	814	763	886	1015
1500	307	355	408	408	475	542	509	590	677
2000	230	266	306	306	356	407	382	443	508
3000	154	178	204	204	238	271	254	295	338
4000	144	144	153	153	178	203	191	221	254

                    
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