Illinois Administrative Code (Last Updated: February 21, 2024) |
TITLE77. PUBLIC HEALTH |
PART870. MANUFACTURED HOME INSTALLATION CODE |
§870.TABLE C. Footing Areas Required for Soil's Load-Bearing Capacity - Design Roof Load 30 Pounds Per Square Foot
Latest version.
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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