DensDeck Prime Roof Board is an exceptional thermal barrier, fire barrier and recovery board used in various commercial roofing systems. The product features a pre-primed surface to make the bond even stronger. The unique construction of DensDeck Prime Roof Board provides superior flute spanning and will help stiffen and stabilize the roof deck. Additionally, it has been shown to withstand delamination, deterioration and jobsite damage more effectively than roofing membrane substrates such as paper-faced gypsum board, fiberboard and perlite insulation. The DensDeck design employs fiberglass mats front and back that are embedded into a gypsum core, providing excellent fire resistance and wind uplift properties.