Building panel with cantilevered retaining members

Claim 1

In a building panel having spaced first and second outer layers joined to opposed first and second surfaces, respectively, of an interior core of foam material, the first outer layer having an exposed surface and an inner surface joined to the first surface of the interior core, the improvement wherein: (1) the first outer layer is a layer of hardened plastic resin with reinforcing material embedded therein; (2) the interior core includes a plurality of spaced recesses along its first surface; (3) a plurality of retention members comprising a plate portion and a retention element extending from an inner surface of the plate portion are arranged within the building panel, with (a) the plate portion of each retention member abutting the inner surface of the first outer layer, and (b) the retention element of each retention member extending into the interior core; (4) a covering patch of reinforcing material extends about the plate portion of each retention member and includes a peripheral portion in contact with the inner surface of the first outer layer, (a) the covering patch being impregnated with plastic resin of the first outer layer and bonded thereto to secure the retention members to the first outer layer with their retention elements arranged at an angle to the first outer layer, (b) the plate portion of a retention member and a covering patch associated therewith being received in a recess along the first surface of the interior core such that the outer surface of the plate portion is approximately flush with the inner surface of the first outer layer; and (5) the second outer layer is a layer of heat reflective metal foil or heat reflective metal foil laminated to paper with the paper joined to the second surface of the interior core.