Impervious Decking Joist Tape - 70mm wide x 20m long butyl tape with a strong adhesive layer which sticks to the top of timber decking joist to form a waterproof capping to prevent premature rotting and decking substructure failure. Our 70mm width provides quick installation and promotes water to run off the joists onto the floor below rather than sitting on the top of the joist and soaking into the timber over time. Resistant to in temperatures between -28C and 80C.
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