Carlon 4 in. 20 cu. in. PVC New Work Electrical Ceiling Box B720R-SHK - The Home Depot

Vycor Deck Protector is a self-adhered membrane, formulated and tested to solve the problems of joist rot and deck corrosion. By covering the tops of deck joists with Vycor Deck Protector, it creates an excellent barrier against water and moisture penetration to prevent joist rot and wood decay. In addition, Vycor Deck Protector is a great solution to the corrosion problem. By installing it where the metal connectors/fasteners come into contact with the pressure-treated wood, the membrane creates a barrier between the copper (in the wood) and the zinc (in the metal). Vycor Deck Protector represents a fast and inexpensive solution that significantly reduces corrosion rates of galvanized connectors to the historical levels of CCA wood. Vycor Deck Protector represents a fast, effective and inexpensive way to significantly extend the useful life of decks