Powers Perma-Seal coated Roof Deck Screws are designed for attaching rigid insulation board, single-ply membrane, and wood blocking to both steel and wood decks. Screws feature a large low-profile Truss style head design with a deep phillips drive for easy installation in both steel and wood roof decking. Manufactured of case hardened carbon steel with a Perma-Seal coating. The deck screws are often used in conjunction with our 3” O.D. Powers 12DRPG #3880 round insulation plates and can also be used with batten bar. For corrosion protection the screws are coated with Powers proprietary black Perma-Seal coating, which meets the requirements of FM Global Standard 4470.