Deck Tape® is a non-butyl self-sealing tape manufactured from a massively strong polymer acrylic adhesive, which gives a completely waterproof and weatherproof seal. With a permanent adhesive bond for 50 years and a 25-year guarantee, this greatly adds to the life of your deck frame. Tested with all timber treatments. Suitable to be used with both traditional timber decking and also the more advanced composite decking, Deck Tape® will protect any timber decking substructure. When using a composite deck board, more of the moisture will be absorbed into the substructure as it will drain off the deck boards. Higher amounts of moisture will mean that the frame will rot faster if not sealed properly.