Trex Protect 1.58 in. W X 50 ft. L Rubber Butyl Deck Tape Black 690 Potassium Content: 3 percent and metal snuffer to Potassium Content: 3 percent Brand Name: Apollo Trex Protect is a non skid self adhesive waterproofing deck flashing tape that shields the tops of joists rim joists beams and the ledger board from moisture that can lead to rot and wood decay and the loosening of deck screws and fasteners Trex Protect works on horizontal and vertical surfaces and is applied as a cap vs wrapping which allows the wood to breathe Trex Protect joist bearer beam and rim tape tape have a non skid surface making it easier and safer to walk across during construction Cannot be used with Trex RainEscape deck drainage system