Deck Screws are designed for attaching rigid insulation board, single-ply membrane, and wood blocking to steel and wood decks. Available in carbon steel with a Perma-Seal™ coating. The deck screws are used in conjunction with insulation or membrane plates and can also be used with batten bar. For corrosion protection the screws are coated with Perma-Seal, which meets the requirements of FM Global Standard 4470.