High Density Cross Linked Polyolefin Foam and Polyethylene Film
4 oz. / sf
3.8 ft (45.5")
4.39 ft. (52.75")
2 mm (.08"), moisture barrier - 6 mil
3.19 (ft2 - F-hr/BTU - in.)
Tensile Strength psi
W 64, L 78
Overlapping Moisture Lip
45 +/- 4
Elongation to Break
W 160, L180
Compression Set % of original thickness
Compression Strength psi
Temperature Tolerance (F)
+178 to -148
Impact Sound Transmission
ASTM E492, ASTM E989-89, Impact Insulation Class (IIC) = 60
Standard Classification for Determination of Impact Insulation Class designed to measure the impact sound transmission performance of a floor-ceiling assembly, in a controlled environment.
Sound Transmission Loss
ASTM E90-99, ASTM E413-87, Sound Transmission Loss (STC) = 53
Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Classification for Rating Sound Insulation to measure the sound insulation properties for the text specimen, in a controlled environment.
Radiant Heat Subfloors and Underlayment
The addition of in floor radiant heating systems has increased dramatically in recent years. As you may know, not all types of hardwood floors can be used over a subfloor with a radiant heat or hydronic heat systems installed. It is also difficult to find information on which flooring underlayment to use over a radiant heat.
Efloors.com has done its research on this, and has determined that the Mohawk Silent Gard underlayment, has little effect on the heat transference from the radiant heat subfloor to the top of the flooring surface. Because of it's open cell technology, they allow moisture and heat to transfer to the upper flooring layer. As long as the surface temperature of the concrete does not exceed 85 degrees F, you will not compromise the underlayment's effectiveness.
The moisture barrier component of the Mohawk Silent Guard is about 1.5 mm thick, not enough to prevent heat transfer through the vapor barrier. Also, for an underlayment to be effective for this application, it must not have an R value greater than 2.5.
However, Visqueen is normally about 6mm thick and may prevent a portion of the heat from these systems from transferring to the upper flooring layer. Also, any closed cell underlayment may block some heat transfer from radiant heat subfloors.