Do the job right the first time with Protecto Wrap Joist Tape. A deck is a big investment and using this great product will insure prolonged life for your project. DECK JOIST TAPE™ is a self-adhering, cold-applied tape used as flashing on deck ledger boards and joists to help prevent moisture penetration around properly installed fasteners. Provides a non-corrosive barrier between treated lumber and metal hangers.Deck Joist Tape is available in 2" wide, 4" wide and 9" wide by 50 foot rolls.