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Why do you need to find the natural ground level when building?
Wiki User
∙ 17y ago
Here is what the IRC (International Residential Code) says about footings and proper placement. R403.1.4 Minimum depth. All exterior footings shall be placed at least 12 inches (305 mm) below the undisturbed ground surface. The basic reasoning for getting down to natural ground level is to get to get below the level of undisturbed ground surface. This includes the ground surface likely to include roots and other bio materials. Undisturbed ground is more likely to properly support the weights applied from a structure over the long term. Take for instance tree roots
Wiki User
∙ 17y ago
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