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If the soil is not dry and dense in the construction site, then the foundation depth should not be less than half a meter. The fact is that in winter it will be slightly lifted, and in the summer, on the contrary, it will fall. This can lead to the appearance of cracks in the walls. Therefore, the depth of freezing of the soil should be set in advance, and the foundation laying is 20 cm below this depth. Small gravel is used to fill the space surrounding the foundation. These measures will not allow soil swelling.