What Is Under Concrete Insulation?
EcoFoil® Under Concrete Insulation is a patented breakthrough product in the concrete slab insulation industry. It is specifically designed for use as a thermal barrier under concrete and works superbly with radiant heated floors. The under concrete insulation, 1/4" - 5/16" thick, is manufactured with a single layer metalized reflective sheet laminated between two layers of strong polyethylene bubbles, R-value of 3.8 and a compression strength of 140 PSI. Under concrete insulation is thin and lightweight making it easy to conform to your grade and reduces your worries of leaving pockets or voids with traditional 4 x 8 sheets of foam board.
Unlike traditional bubble insulation, where the foil is exposed, this patented product is encapsulated. This was done for two main reasons; integrity of the foil and the airspace it creates for effectiveness. If the foil surface comes into direct contact with certain acidic soils it can corrode the reflective properties of the insulation. This can also happen during the curing process of concrete. For this reason, standard radiant barriers or bubble insulation are not an appropriate insulation for an underground application. It is also important to maintain an airspace on one side of the insulation in order for it to be reflective. By laminating the reflective metalized sheet in between two layers of our sturdy bubble insulation we have ensured the integrity of the foil by protecting it from corrosion and deterioration. We are also maintaining an air space by placing the foil in between the bubble layers.
Most importantly, the under concrete insulation reflects 57% of the radiant heat back up towards the surface, whereas without concrete insulation, this heat would travel down and be lost in the soil. Additional benefits for the under concrete insulation is that it provides a vapor and radon barrier. You must tape the seams together so when finished the insulation acts like one sheet.
Where Is Under Concrete Insulation Used?
Just like the name implies, this insulation can be used under any concrete slab to reflect 57% of radiant heat. This includes new construction and remodeling applications. Under concrete insulation is the perfect product to use with a radiant heating system. It will make your heating system more efficient, reflecting 57% of the radiant heat, creating shorter run times and less cycles throughout the day. Another use is on top of an existing slab before you put down carpet pad and carpet.
You must use tape to seam the insulation, this way the product acts as one sheet and will act as a vapor and radon barrier.
EcoFoil under concrete insulation is a thin lightweight product that conforms with your grade so installation is a breeze. The important thing to remember is that there is a lot of heat loss out of the side of the slab. Make sure when installing the insulation to come up the sides of the forms. This will reflect the heat and push it back into the building. After laying the insulation on the grade, remember to tape your seams, and then install your rebar or remesh. Now you can install your heating system per the manufacturers installation instructions. The product is designed to handled the weight of job site traffic including wheelbarrows and concrete buggies.
If you have an application that you have questions on, please call one of our product specialists at 888-349-3645.
Ultra Under Concrete Insulation Specifications
Download a printable spec sheet for this product: Under Concrete Insulation
|Weight||1.16 oz/sq. ft.|
|Temp Range||-50F to 180F (ASTM C411)|
|Emissivity||43% (ASTM C1371-04A)|
|Reflectivity||57% (ASTM E903)|
|Compression Strength||140 psi (ASTM D751)|
|Tensile Strength||21.13 lbs/sq. in. (CAN/CGSB - 51.33-M89)|
|Deflection||<10% under 0.5 psi (ASTM 1621)|
|Puncture Resistance||85 lbs/sq. in.|
|Water Vapor Permeability||<0.01 Perms (ASTM E96)|
|Resistance to Fungi||Does Not Promote Growth (ASTM C1338)|
|Flexibility||No Cracking (CAN/CGSB - 51.33-M89)|
|Thermal Resistance||R-3.8 (ASTM C236*)|
*ASTM C236 was replaced in 2001 by ASTM C1363. C236 - Standard Test Method for Steady-State Thermal Performance of Building Assemblies by Means of a Guarded Hot Box' and the current standard ASTM C1363-05 - 'Standard Test Method for Thermal Performance of Building Materials and Envelope Assemblies by Means of a Hot Box Apparatus' both test for and demonstrate thermal transmittance in building materials.