Gypsum fiber building board, has four stepped edges, where two edges are designed as angular, asymmetrical grooves and other two edges are designed as springs, and asymmetrical stepped notch with specific thickness

摘要

The board has four stepped edges, where two edges are designed as angular, asymmetrical grooves and the other two edges are designed as springs. An asymmetrical stepped notch having a thickness of about 25 to 40 percentage of entire slab thickness is provided. The groove has a thickness of about 75 to 60 percent of the entire slab thickness, and a depth of about 25 to 30 percentage of the depth of the stepped notch.