Patent ID: 8042205

Claim:
A method of making a foundation unit, comprising the steps of a. providing at least three elongated, preassembled truss rails, four end caps and a plurality of cross slats, b. assembling said truss rails, end caps and cross slats together and substantially abutting one another into a kit, c. subsequently opening the kit and orienting said truss rails in a parallel, spaced position, wherein all of the truss rails are substantially identical, d. affixing one of said end caps to said truss rails at one end thereof and affixing a second of said end caps to said truss rails at an opposite end to form a partial foundation, e. inverting said partial foundation, f. affixing a third of said end caps to said truss rails at one end thereof and affixing a fourth of said end caps to said truss rails at an opposite end, and g. affixing said cross slats to said truss rails in a spaced, parallel orientation between said third and fourth end caps to form an upper support, such that the respective top surfaces of each of said end caps and said cross slats are substantially coplanar and vertically disposed above the respective top surfaces of said truss rails.