Patent ID: 8204698

Claim:
A method of determining structural parameters of wallboard, comprising: providing a core strength of the wallboard; determining a required nail pull value based on a thickness of the wallboard type; calculating by a processor a face paper stiffness value based on said provided core strength value and said determined nail pull value, wherein said face paper stiffness value is based on the following equation: Nail Pull (lb f )= a (lb f )+[ b (lb f /(kN/m))×(face paper stiffness (kN/m))]+[ c (lb f /psi)×(core strength (psi))] wherein a= 4.2126759 ,b= 0.009490606731 and c= 0.092421774; displaying said calculated face paper stiffness value on a display device; and selecting a face paper type for the wallboard based on said displayed face paper stiffness value.