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Polar Fold Siding Underlayment
Polar Fold was developed to provide a flat and level surface for new siding, in addition to providing energy efficiency, moisture resistance, strength, durability, and value.
Polar Fold wraps your home in a continuous insulation envelope that reduces air infiltration and gives you a lifetime of energy savings. Polar Fold lays flat and is easy to install and helps smooth out imperfections, thus providing a higher quality project.
Available in 4’ x 50’ sheets and comes in 3/8" and 1/2" thickness.
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| Physical Properties |
| Property |
Unit of
Measure |
3/8" +FF
375 |
3/8" +RF
375 |
1/2" ++FF
500 |
1/2" ++RF
500 |
| Thermal Resistanace "R" Value |
Per Thickness |
1.50 |
4.3* |
2.00 |
4.8* |
| Compressive Strength |
PSI |
10 |
10 |
10 |
10 |
| Water Vapor Permeance |
Perms |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
| Water Absorption |
% by Volume |
<1.0 |
<1.0 |
<1.0 |
<1.0 |
Caution: EPS contains a flame retardant; however, it should be considered combustible and not exposed to sources of ignition
+FF (Film Faced)
+RF (Relective Facing)
*System R-Values are calculated from the ASHRAE Handbook of fundamentals with the reflective facing adjoining a 3/4" parallel dead air space. The R-Values of these products installed without an airspace are 2.0 (1/2"), 3.0(3/4"), and 4.0(1")
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Installation Instructions
1. The substrate should be flat, dry, and free of any foreign materials that would damage the Polar Fold insulation board. Beginning of installation indicates that the installer has accepted the condition of the existing substrate.
2. Install Polar Fold directly over existing substrate using galvanized or aluminum roofing nails, remove any damaged siding and install directly over framing members if necessary.
3. Avoid overdriving of fasteners because this will compress the insulation and create a wavy appearance of the new siding exterior. The installer should be careful when installing under new siding materials. The board must lay flat and be adequately fastened.
4. Install the new siding directly over the Polar Fold per the siding manufacturer’s recommendations.
5. A higher R-Value can be achieved by using 1/2" furring strips between the existing substrate and the Polar Fold reflective surface. (Consult the physical properties chart for R-Value information)
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