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Dow Thermax Sheathing 4' x 8' Polyiso (All Sizes) Polyiso Thermax Sheathing
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Dow Thermax Sheathing 4' x 8' Polyiso (All Sizes)


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Estimated Delivery Time 7-10 Working Days

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/Bag
0.5" R3 32
1" R6 32
1.5" R10 32
2" R13 32

Used In

  • Insulate residential and commercial walls
  • Residential closed (non-vented) crawl spaces
  • Interior basement walls
  • Interior walls of metal buildings

Product Advantages

  • Can be installed exposed to the interior without a thermal barrier
  • Reinforcing facers, along with chemical modifications, contribute to fire resistance and dimensional stability
  • Suited for hourly rated assemblies
Product Length 96"
Product Width 48"
R-Value R13
Brand Dow
Material Facing Foil-Faced
Material Type Polyiso
Product Type Batt,Rigid Board

Est Delivery between and .

Delivery will always take place on a weekday (Mon - Fri).
For information on delivery costs and more view our delivery info page.