Insul-Tarp ground insulation under radiant heating cables.     
Insul-Tarp under slab insulation is the easiest ground insulation to install and the most effective. The picture above shows Insul-Tarp in-slab insulation installed under radiant floor heating cable attached to wire mesh.

TESTIMONIALS

"The absolutely incredible thing about Insul-Tarp was the performance during heat up times of the slab. Projects done with 2" polystyrene seem to take up to 30 percent longer get up to temperature.This product works better than any other product we have tried

   – Michael Willburn,
      Hi Valley Supply
"When compared to the cost of styrofoam and the cost of installing and cutting styrofoam, it is much more cost efficient to use Insul-Tarp."

   – Carlo Serapiglia,
      United Plumbing

Insul-Tarp Technical Product Information

 

Insul-Tarp® Insulation Materials and Construction

Insul-Tarp in-slab insulation is constructed of features a unique construction that includes the following top-quality materials:

  • Cross-woven polyethylene for rugged durability
  • High density closed-cell foam
  • High density polyethylene bubble
  • Two layers of reflective aluminum 
Physical Properties of Insul-Tarp Ground Insulation

Property Test Method Insul-Tarp
Average Thermal Resistance ASTM C 518 R - 7.5
Tensile Strength and Elongation*
 ASTM D 412 136 PSI
Tensile Strength** ASTM D 751 45 lbs-f/in.
Compression Set ASTM D 3575 4.3 %
Bursting Strength* ASTM D 751-73 90 PSI
Maximum Use Temperature   180° F
Minimum Use Temperature   -60° F
Water Vapor Permeance ASTM E 96 .002 Perms

  * Denotes testing on bubble pack only
** Denotes testing on cross woven polyethylene only

Tested R Value (R-7.5)
Insul-Tarp was tested in accordance with ASTM C 518, Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Heat Flow Meter Apparatus. See the Non-Radiant Testing PDF in the table below for a detailed summary of the testing procedure and results.

Performance Equivalent: R-10 (Under Radiant Heating Systems)
When calculating heat loads for radiant heating systems, a performance equivalent of R-10 can be used. Although this is not a tested R-value, field and laboratory tests support this number as a reasonable gauge for measuring performance. The Lab Test 1 and Lab Test 2 PDFs in the table below illustrate Insul-Tarp's radiant heating performance.

Insul-Tarp Specifications and Test Result Documentation

Insul-Tarp Product Documentation  Format
Non-Radiant Testing   
Insul-Tarp Installation Guide   
Insul-Tarp Product Specifications   
Insul-Tarp Test Data Sheet   
Insul-Tarp Lab Test 1   
Insul-Tarp Lab Test 2   

 
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