Calculadora de Fundação Grátis
Calcule as dimensões e o volume de concreto para fundações de construções. Projeto seguro e econômico.
Minimum Footing Area
10.0 sq ft
Minimum Footing Area vs Total Load on Footing
Formula
## Footing Sizing **Footing Area = Total Load / Soil Bearing Capacity** The bearing capacity depends on soil type: soft clay 1,000 psf, medium clay/loose sand 2,000 psf, dense sand/gravel 3,000-4,000 psf, bedrock 8,000+ psf. Always get a soil test for structural footings.
Exemplo Resolvido
20,000 lb column load on soil with 2,000 psf bearing.
- 01Area = 20,000 / 2,000 = 10 sq ft
- 02Square footing = sqrt(10) = 3.16 ft per side
- 03Use a 3.5 x 3.5 ft footing (12.25 sq ft) for safety.
Perguntas Frequentes
How deep should footings be?
Footings must extend below the frost line, which varies by region (12 in in the south to 48 in or more in northern states). Check your local building code for the required depth.
What if I do not know my soil bearing capacity?
A geotechnical soil test is the most reliable method. Without a test, most codes allow a presumptive value of 1,500-2,000 psf for undisturbed soil, but this is conservative.
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