Patent ID: 9695568
Date: 2017-07-04
CPC Classifications: E02D,E04G

Claim:
1. A method, comprising constructing a foundation for a building at a building site, said foundation comprising a permanent frost protected shallow foundation footing for said building, said method comprising: assembling a plurality of sectional form units so as to be set partially below ground level and partially above ground level alongside each other to form abutting sectional form units as concrete forms for said permanent frost protected shallow foundation footing for said building, each form unit formed with open ends, said plurality of section form units assembled with said open ends in abutment with adjacent form units in end to end alignment with each other, each form unit comprising insulating foam material shaped with an overhang part and an interior boot shaped cavity having a foot cavity formed opposite said overhang part, said interior boot shaped cavity also having a throat opening that opens said foot cavity to outside said form unit, wherein a narrower part of said foot cavity extends from a wider part of said foot cavity to said throat opening, said form unit having an outside surface shaped as a u-shaped channel having said interior boot shaped cavity formed within by a channel bottom leg joined to a long channel leg and to said overhang part opposite said long channel leg and shorter than said long channel leg such that said long channel leg and said overhang part are each perpendicular to said bottom leg on said outside surface of said form unit with said long channel leg having a uniform thickness and with said overhang part having a non-uniform thickness that is thinnest where said overhang part joins said bottom channel leg and thickest at a top end of said overhang part so as to form an inner wall of said throat opening of said form unit, said overhang part formed with a flat top end that is wider than formed at a flat top end of said long channel leg, and wherein said foot cavity has, in a cross section perpendicular to a longitudinal axis of said form unit, said wider part of said foot cavity adjacent said channel bottom leg, and pouring concrete through the throat opening of at least one section form unit, said throat opening receiving said concrete pour, said pour at least in part filling said boot shaped cavity in each of said plurality of section form units assembled in end to end alignment with each other.