| Soil Description | Allowable Soil Bearing Pressure psf(kPa) |
SF 22 Allowable Load lbs (kN) |
SF 28 Allowable Load lbs (kN) |
SF 32 Allowable Load lbs (kN) |
|---|---|---|---|---|
| Soft clay | 1,000 psf (47.88) |
3,360 (14.9) |
5,440 (24.0) |
7,100 (31.6) |
| Clay, sandy clay, silty clay, and clayey silt | 2,000 psf (95.76) |
6,720 (29.9) |
10,880 (48.4) |
14,200 (63.1) |
| Sand, silty sand, clayey sand, silty gravel, and clayey gravel | 3,000 psf (143.64) |
10,000 (44.5) |
16,320 (72.6) |
21,300 (94.7) |
| Sandy gravel or gravel | 5,000 psf (239.40) |
16,800 (74.7) |
27,200 (121.0) |
35,500 (157.8) |
| Sedimentary rock | 6,000 psf (287.28) |
20,000 (88.9) |
42,600 (189.4) |
42,600 (189.4) |
| Crystalline bedrock | 12,000 psf (574.56) |
40,300 (179.2) |
65,280 (290.4) |
85,200 (378.8) |
The allowable loads shown to conform to IBC 2015, Section 1806, Table 1806.2
Do not under-order, open our Concrete Calculator. Concrete shall have a minimum of 3000psi 28 day compressive strength and consist of not more than 3/4 inch (1.91 cm) aggregate. Recommended slump of 5" (12.7 cm) to 6" (15.24 cm).
Sound Footings LLC has received confirmation from ICC Evaluation Service, Inc (ICC-ES) that SquareFoot™ is the first and only (6/2006) plastic footing form to comply with the provisions of the EVALUATION GUIDELINE FOR PLASTIC FOOTING FORMS EG292 and SquareFoot™ complies with the following codes; Division 2: Site Construction; Section 02450 - Foundation and Load Bearing Elements and Division 3 - Concrete; 03130 - Permanent Forms. This confirmation, as evidenced in ICC-ES evaluation report ESR-1131, provides guidance to code officials faced with approving the use of SquareFoot™ under these codes. The evaluation report is available here: ICC ESR Report #42931.
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