Dow THERMAX Sheathing is a rigid foam insulation that effectively reduces condensation for exceptional moisture protection. Dow THERMAX 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.


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