WiseWrap JoistTape, 3" x 75' Self-Adhesive Joist Barrier Tape, 1 RollCreate a waterproof seal that helps stop decay and wood rot with WiseWrap JointTape from Deckwise. This self adhesive barrier tape is a polyethylene, water resistant lumber flashing material which utilizes a rubber asphalt mastic adhesive. When this tape is applied to the top of decking joists, over ledger boards and around support posts, it creates a waterproof seal that helps stop decay. This tape will self seal around deck screws or nails further