SPAX® Deck Beam Tape optimizes the life of the deck and ensures a long-lasting, professional installation by protecting fasteners and deck beams from water damage. SPAX Deck Beam Tape is 3-1/4" wide and is designed to work on board applications such as a beam (or a girder) which is a board or a composite of more than one board that serves as a supporting structure for the deck joists, which meet it perpendicularly. SPAX Deck Beam Tape is compatible with most deck materials including pressure treated wood and composite products.