SOILS
Buildings rely on the soil beneath them to stay put. If the
soil under the house moves up, down, or sideways, the house is in trouble.
Designers of homes may know quite a bit about the soil conditions at a site and
may design the building exactly for those conditions. More commonly, soil
conditions are assumed to be a certain type, and footings and foundations are
designed with a margin of safety to account for adverse soil conditions, within
reasonable limits. Occasionally we guess wrong and the building moves, but for
an average site, it costs more to find out how good the soil is over the whole
site than to design a system that will work on most soils.
Soil types and order of their bearing capacity:
1. Bedrock
2. Gravel
3. Coarse sand
4. Fine sand
5. Clay
6. Silt
7. Organic material
Bearing Strength of Soils
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