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Polar R Siding Underlayment
All beautiful siding projects begin with a solid foundation. You need material that provides a flat and level surface for new siding. Polar R is breathable, allowing unwanted vapor to escape, while retaining superior water resistance.
Polar R lays flat and is easy to install. The leveling capability of Polar R helps to smooth out imperfections thus providing a higher quality project. When you re-side, Polar R improves the energy efficiency of a house and helps the siding look better.
Available as a 4’ x 8’ sheet in a range of thicknesses: 1/2”, 3/4”, 1”, 1 & 1/2", 2”, 3”, and 4”
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| Physical Properties |
| Property |
Unit of
Measure |
1/2" +FF
500 |
1/2" +RF
500 |
3/4" ++FF
750 |
3/4" ++RF
750 |
1" ++FF
1000 |
1" ++RF
1000 |
| Thermal Resistanace "R" Value |
Per
Thickness |
2.0 |
4.8 |
3.00 |
5.8 |
4.0 |
6.8 |
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 R insulation board. Beginning of installation indicates that the installer has accepted the condition of the existing substrate
2. Install Polar R 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 R per the siding manufacturer’s recommendations.
5. A higher R-Value can be achieved by using ½” furring strips between the existing substrate and the Polar R reflective surface. (Consult the physical properties chart for R-Value information).
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