Abstract: A collapsible spacer for disposition between a form for a concrete foundation member and the underlying soil includes voids to allow the spacer to deform permanently and occupy a reduced volume when upheaving of the soil occurs. The spacer is fabricated from a material, such as expanded polystyrene foam, whose structural strength is not significantly altered by exposure to moisture. Embodiments of the spacer which are suited for use with forms for foundation beams and slabs are discussed.
Type:
Grant
Filed:
July 22, 1993
Date of Patent:
October 4, 1994
Assignee:
Plasti-Fab Ltd.
Inventors:
Bruce M. Carruthers, F. Gordon French, B. Wayne Heath, Randal B. Smith