Dow Thermax Sheathing 4' x 8' Polyiso (All Sizes) Thickness:1/2 in Many have noted that the

Many have noted that the product effectively insulates against heat transfer

Excellent long-term stable insulating performance with an R-value of R-5 per inch

Use as tested

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Dow Thermax Sheathing 4' x 8' Polyiso (All Sizes) Thickness:1/2 in Many have noted that theTHERMAX Sheathing is specially designed to have a Class A fire rating and can be used in a range of concealed and exposed applications, above and below grade. Because of the improved fire performance it is best suited for hourly rated assemblies. It has nominal 1. 0 mil, smooth aluminum foil facers on both sides. THERMAX Sheathing effectively reduces condensation for exceptional moisture protection. Thickness R Value Sq Ft Board 0. 5" R3 32 1" R6 32