National Gypsum PermaBase® BRAND Cement Board is a rigid substrate made of Portland cement, aggregate and glass mesh that provides an exceptionally hard, durable surface that is able to withstand prolonged exposure to moisture. PermaBase is ideally suited as an underlayment or backing surface for tub and shower surrounds, countertops, flooring and a variety of other interior and exterior applications.

In addition to being the ideal solution for interior walls or floors, PermaBASE cement board products are also a great option for exterior walls. A rigid substrate made of Portland cement, aggregate, and glass mesh, they provide an exceptionally hard, durable surface that is able to withstand prolonged exposure.