Dens-Deck Prime Roof Board combines an exceptional fire barrier, recovery board and thermal barrier used in various commercial roofing systems with a pre-primed surface to make the bond even stronger. Its unique construction provides superior flute spanning and will help stiffen and stabilize the roof deck. Additionally, it has been shown to withstand deterioration, delamination, warping and job-site damage more effectively than roofing membrane substrates such as paper-faced gypsum board, fiberboard and perlite insulation. The patented Dens-Deck design employs glass mat facings front and back that are embedded into a water resistant and moisture resistant treated gypsum core, moisture resistance, providing excellent fire resistance and wind uplift properties.