Trusscore Inside Cove Corner Trim is used to complete inside corners and the intersection of walls and ceilings on Wall and Ceiling Board installations. The Trusscore tongue and groove interlocking system makes installation quick and easy, and the unique truss design provides industry leading strength and durability. Trusscore Wall and Ceiling Board is available in a width of 16" that can be installed either vertically or horizontally for quick and easy installation.