Ill. Admin. Code tit. 77, pt. 870, tbl. C

Current through Register Vol. 48, No. 49, December 6, 2024

Table C - Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 30 Pounds Per Square Foot

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)
3550	4150	4750	4750	5550	6350	5950	6950	7950
Soil's Load- Bearing Capacity (lbs/ft²)	Footing Area (square inches)
1000	511	598	684	684	799	914	857	1001	1145
1500	341	398	456	456	533	610	571	667	763
2000	256	299	342	342	400	457	428	500	572
3000	170	199	228	228	266	305	286	334	382
4000	144	148	171	171	200	229	214	250	286