Going to start building a low-storey building from a beam, limestone or SIP panels, it will be reasonable to dwell on a lightweight-type foundation that will save you a lot of funds-after all, the foundation often eats up to a third of the construction budget! Of the most common types, it is worth mentioning tape and columnar foundations. Ribbon, as the name implies, is a tape of concrete, laid on a sand pillow in a recess repeating the outlines of the walls of the house. They allow, if desired, to use space under the floor of the first floor; They are mainly used for houses built from shells or aerated concrete.