![]() ![]() If you are building on material with a high load bearing value (LBV), like bedrock, your footings may be smaller than at a site with sandy soil, which has a low LBV. ![]() The exact dimensions of footings will vary and will be determined in part by the type of soil at the site. They should also be a minimum of 12 inches wide. These concrete bases for the stem walls should be a minimum of 12 inches below the line of undisturbed soil and 12 inches below the frost line (or they should be frost protected). You’ll only need large equipment like rollers for bigger projects. Use a plate compactor and make additions to the soil (like gravel), if needed, to achieve a soil that is adequately dense and uniform for your project. You’ll want to remove any large stumps, and also confirm with local authorities that no trees on the lot are protected. Remove any plants as well as other debris. While there are variations on how stem walls are constructed, several first steps are common to all of them: (In those situations, the amount of concrete required for a slab foundation can quickly become expensive.) How are stem wall foundations constructed? By raising the base of the house, the entire structure is elevated.Ī special case: If the lot you are building on is on a slope, a stem wall foundation has some particular pluses in that its height can be varied depending on the ground elevation at different points.
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