Method and apparatus for forming building foundations

Claim 1

A process for forming a perimeter-type building foundation comprising a footing and wall atop said footing from a hardenable plastic material, said process comprising: (a) mounting a first elongate form having the general shape of said footing upon a working surface; (b) pouring a first predetermined amount of said plastic material into said first form so as to form said footing; (c) forming a pair of parallel, elongate, transversely spaced grooves and an intermediate elongate keyway parallel to and equidistant from said pair of grooves longitudinally in a top surface of said footing while said plastic material is in said plastic state; (d) thereafter allowing said plastic material to harden; (e) thereafter mounting a second elongate form having the general shape of said wall and comprising a pair of opposed upright sidewalls upon said top surface of said footing so that the interior of said second form is exposed to said keyway and inserting a lower part of each of said sidewalls into a respective one of said pair of grooves so as to obtain lateral anchoring support from said grooves; (f) pouring a second predetermined amount of said plastic material into said second form and into said keyway so as to form said wall and a key integral to said wall; and (g) allowing said second amount of plastic material to harden.