Lightweight concrete panel

Claim 1

In a building having a structural framework with spaced frame members, a lightweight concrete structural panel comprising: a. a reinforced rectangular panel of lightweight low-density concrete having a smooth planar upper surface and a peripheral frame, b. a continuous metal reinforcing grid embedded in the concrete, c. the lower surfaces of the peripheral frame being co-planar and the side edges thereof presenting a concrete surface which is shaped to interfit a matching surface of an adjoining panel, d. the peripheral frame including an embedded and enlarged grid member disposed adjacent to the frame exterior surfaces and integral with the reinforcing grid so that rigidity and strength are imparted thereto, e. the lower surface of the panel having successive, narrow, continuous and parallel longitudinally extending crests and troughs extending between the peripheral frame, f. the troughs extending inwardly approximately one-half the thickness of the panel, and the crest surfaces being flat and coplanar with the lower surfaces of the frame, g. the crests and troughs being approximately the same lateral dimension and having a width approximately equal to the thickness of the panel, h. a thin continuous coating of acoustical composition which is applied to the lower surface of the panel, including troughs, crests, and frame, to provide an integral resilient, mounting therefor between the panel and the frame members, and i. the low density concrete composition of the panel including hydraulic cementitious material including lightweight aggregate and sufficient density reducing means for enabling nails to readily pass therethrough.