The total mass of the structure should not be more than can withstand the soil. For example, if there is large sand on the site, then 1 cm² can arrive from 3.5 to 4.5 kg, with wet sand from 2 to 3 kg. If the clay is solid, then it can withstand from 3 to 6 kg, and if there is crushed stone or gravel on the site, then 1cm² can withstand up to 6 kg. Here also taken into account the weight of the base. This calculation of the load on the foundation is made individually for each construction.