Water damage is the most common reason for deck replacement. Water that accumulates under the deck boards does not dry out easily. Grace Deck Protector self-adhered flashing provides protection for your deck joists from mold, dry rot, and decay saving you from costly repairs in the future. This flashing also protects from corrosion - by installing Vycor Deck Protector where the metal fasteners connect with the wood, the membrane creates a barrier between the copper (in wood) and the zinc (in metal).