Patent ID: 11878486
Assignee: CERTAINTEED GYPSUM, INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC B  E  Y | IPC B  E

Claim 15:
16. A composite building board with enhanced nail pull strength, the composite building board comprising:
an exterior paper face forming an outer face of the building board;
a set plaster core positioned beneath the exterior paper face, the set plaster core formed from a cementitious slurry of predominantly calcium sulfate hemi-hydrate; and
a polymer-based spray coating or a coating polymer applied directly to the exterior paper face of the building board, the spray coating having a tensile modulus above 500 psi and an elongation at break of greater than 500% at room temperature and improving a nail pull strength of the building board relative to an identical building board without the spray coating by at least 10% as compared to an identical building board without the polymer-based spray coating.