1. Asphalt concrete foundation: good strength and ductility, is an ideal base, a large area north and the temperature difference between the cold climate is particularly applicable, but expensive; ordinary bitumen (asphalt base often choose to do, the price is slightly cheaper); hydrophobic bitumen (too costly, complex construction, use less).
2. Cement foundation: strength, economical and practical, suitable temperature difference smaller area, but poor ductility;
3. Cement powder foundation: short duration, low cost, good drainage properties, but poor weather, easily oxidized, resulting in uneven;
4. Hydrophobic gravel foundation: the lowest cost, good drainage performance, but more difficult to control the flatness problem more.