Patent ID: 7431536

Claim:
A method of making a flat foundation for a floor of a structure without substantial excavation comprising the steps of: excavating an earth base course ( 1 ), providing at least one drainage bedding layer ( 2 ) on the earth base course ( 1 ), compacting the bedding layer ( 2 ) using multiple travels of a roller on the bedding layer, spreading at least one layer of a plastic cellular foil ( 3 ) having vertically extending and upwardly open compartments on the drainage bedding layer ( 2 ), overfilling the compartments of said cellular foil ( 3 ) with fill ( 4 ) of Quarry stone of grain size 8 to 63 mm so that the fill ( 4 ) extends above the height of the cellular foil ( 3 ) by at least 25 cm, compacting the fill ( 4 ) over the cellular foil by at least eight travels of a roller of 10 to 11 metric tons weight and with vibration to form compacted fill ( 4 ), and laying a floor layer ( 5 ) of the structure on the compacted fill.