Dow Thermax Sheathing 4' x 8' Polyiso
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About the Dow Thermax Sheathing 4' x 8' Polyiso
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. THERMAX Sheathing effectively reduces condensation for exceptional moisture protection.
Thickness
R-Value
Sq Ft/Board
0.5"
R3
32
1"
R6
32
1.5"
R10
32
2"
R13
32
2.5"
R16
32
3"
R18
32
Used In
• Insulate residential and commercial walls