DensDeck® Prime Roof Board has been enhanced to provide broader compatibility and higher performance with roofing adhesives. For fully adhered and self-adhered roofing systems as well as hot mopped, cold mastic and torch-applied modified bitumen roofs, it provides a stronger, more economical installation by reducing the amount of mastic or adhesive, potentially eliminating the field primer. It is the first and only gypsum roof board with a limited warranty against delamination or deterioration for up to 90 days of exposure to normal weather conditions when applied vertically on parapet walls. They are resistant to mold growth and have scored a 10, the highest level of performance for mold resistance under the ASTM D3273 test method. For more information, visit