National Gypsum Gridstone, Seaspray and High Strength ceiling panels are a specialty gypsum board with increased uniformity and integrity of the gypsum core, making its sag resistance equivalent to 5/8" type X wallboard.

These Ceiling Panels install easily in standard 2' by 2' and 2' by 4' exposed grid systems and have a rigid gypsum core which provides extra resistance to sagging and warping.