4X8X3/4 T&G STYROFOAM PSI 25 DOW BLUE 3.8 R VALUE DUPONT"
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Designed with grooves to lock into the next sheet, Styrofoam Brand Tongue and Groove Foam Insulation is easy to install and lightweight while providing moisture resistance and thermal efficiency. Suited for a wide range of residential and commercial construction applications. Lockable edges speed installation.