COLLAPSIBLE SPACER

摘要

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 expanding 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.