Patent ID: 7765761

Claim:
A polymer-based composite structural sheathing board for use in the formation of a building wall and/or ceiling system by overlaying and being secured to a structural building wall and/or ceiling frame, comprising: a polymer material or predominantly polymer material core layer with a density between 1.6 lbs/ft 3 and 25 lbs/ft 3 ; the core layer having a length, a width, and a thickness; the core layer having a first major surface and a second major surface that are each defined by the length and the width of the core layer; at least one of the major surfaces of the core layer being overlaid by a facer that reinforces, stabilizes, and strengthens the polymer-based composite structural sheathing board and that is generally coextensive with and bonded to the overlaid major surface of the core layer; wherein the polymer-based composite structural sheathing board has a compressive strength of at least 25 psi, a flexural strength (MOR) of at least 400 psi, a flexural strength (load at yield) of at least 20 lbf, and a fastener pull through strength of at least 20 lbf.