It is used on a solid base: cobblestones, concrete, balconies, roofs, crushed stone, gravel, earth.
Terrace support pedestal AP4 is used :
For stone terrace structures. Wooden boards for terrace structures. Wooden tiles for terrace structures. For concrete tile terrace structures. For solar power/battery structures. For structures of summer houses/garden houses/bathhouses. For tile floor constructions. For pool/fountain constructions. For temporary structures/pavilions/mobile homes. For industrial floors.