DensDeck Prime Roof Board's patented design features a gypsum core with embedded glass mat facers on the top and bottom of the board. It is compatible with solvent based bonding adhesives. For applications in which Carlisle's FAST™, or Flexible FAST Adhesive is used to attach insulation and a vapor barrier is specified, DensDeck Prime can be used as a base layer for Carlisle's VapAir™ Seal 725TR Air and Vapor Barrier (in conjunction with CCW 702-LV or CAV-GRIP™ Primer). It can be used in a variety of commercial roof systems and provides an excellent thermal barrier as well as exceptional fire, moisture, and wind uplift resistance properties and is typically used as a cover board over insulation in fully adhered EPDM, TPO, and PVC applications. DensDeck Prime is also compatible with hot asphalt and can be used as a membrane underlayment in hot mopped roofing systems or as a parapet wall substrate in all systems.