If the formwork is installed on an uneven surface, then it is necessary to align the foundation, that is, make a spatch. For this, sand is brought, and the slope is aligned according to the drawings, and only after that they begin work on the construction of the base under the house. There is another option — this is soil cutting to the desired height. Here you can equip a garage, or another room, and in order for the soil not to crumble, they make supports in the form of columns that will rest against a hinged building.