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When applied to the top of deck joists, deck Flash barrier, creates awaterproof membrane that prevents wood rot and decay caused by theaccumulation of water under the decking boards. Deck Flash Barrier\'s uniqueasphalt mastic adhesive self-seals around screws and nails, blocking a primarypathway for water infiltration into deck joists. By blocking moisture andpreventing wood rot, deck Flash barrier, maximizes the life of your new deck.3\" X 75\' When applied to the top of deck joists creates a waterproof membranethat prevents wood rot & decay caused by the accumulation of water under thedecking boards super grip adhesive can now be installed at temperatures downto 25 degrees Fahrenheit self seals around screws & nails blocking a primarypathway for water infiltration into deck joists thus preventing wood rotcreates a physical barrier that prevents corrosion of the metal surface causedby contact with ACQ ca-b, & adze treated lumber can be used to protect metalflashing, joist hangars, the deck plates, sill plates & anywhere treatedlumber is used. Corrosion barrier When deck Flash barrier is placed betweenACQ, ca-b, or adze treated lumber and metal surfaces, such as galvanized metaland aluminum, it creates a physical barrier that prevents the corrosion of themetal surface caused by contact with chemicals in treated lumber. It can beused to protect metal flashings and hangars, at deck plates and sill plates,and anywhere treated lumber is used.