Under Slab Insulation For Radiant Floors and Concrete

Under Concrete Insulation roll

Under Slab Insulation 

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Features of The Best Slab Insulation


Designed to withstand the weight of vehicles and the rigors of foot traffic. Prodex Total Under Concrete Insulation is ideal for concrete slabs, radiant floors and driveways. This slab insulation is 0.2 inch, (5mm) closed cell polyethylene foam covered on one side with reinforced foil facing. Prodex exhibits less than 9% compression in thickness when subjected to loads associated with standard concrete floor systems. (Note: The amount of pressure under a typical four inch concrete slab section is less than one pound per square foot). 

With a perm rating of less than 0.1, this class 1 vapor barrier it excels in water protection. It is also ideal for retarding the passing of soil gasses such as radon into your home. The reinforced foil also serves to prevent the penetration of termites. 

Benefits of this product include: Thermal break, radiant barrier, durability, moisture resistance, low water vapor transmission, radon resistance, termite resistance and ease of installation.

Prodex Under Concrete Insulation will make the basement floor warmer. Prodex is an effective barrier against the upward migration of radon through joints, cracks and other openings in the building foundation into your living space. Radon is radioactive gas found in soils, rock and groundwater. It is formed by natural decay of radium and uranium isotopes. Radon levels vary depending on the geologic makeup of your location. Radon is naturally emitted from the ground where it is diluted to an insignificant level by the atmosphere. Inside a sealed and insulated building, radon can concentrate into high and potentially dangerous levels.


Features of The Best Slab Insulation

  • Designed specifically for under slab applications
  • Less than 9% compression in under concrete applications (4" slab)
  • Ideal for radiant heat floors
  • Can reduce heat loss by 56%
  • Eliminates dampness and condensation in concrete
  • Vapor barrier (per rating less than 0.1)
  • Radon barrier
  • Thermal break
  • Seals around nails


Under Slab Insulation Pricing | Buy Radiant Floor Insulation

  • Insulation roll pricing on product page
  • Shipping calculator on every page in blue bar
  • For Discount volume pricing or to buy under slab insulation click the "Order Here or Get A Quote" button 

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Installing under concrete, as radon barrier and under wood floor.

Radon barrier Insulation Insulation under radiant concrete floor insulation under floor with radiant heat

Radiant Floor Insulation - Under Wood Floors

Prodex Total (16 Inch24 inch 48 Inch10M and Fast Action) is radiant floor insulation used under wood flooring to reflect radiant heat upwards back into the home. Prodex is a thermal breakvapor barrier and radiant barrier. This radiant heating insulation can be used under most flooring material. 0.2 inch (5mm) closed cell polyethylene foam covered on both sides with reinforced foil facing. 

Benefits of these products include: Thermal break, radiant barrier, durability, moisture resistance, low water vapor transmission, radon resistance, termite resistance and ease of installation. 

 Confidence In Our Under Slab Insulation

  1. Independent I4L and Prodex Insulation reviews at Site Jabber. Site Jabber is the leading community of online business reviewers. The community helps consumers find great online companies and avoid scams. The community has grown to over 850,000 members and has reviewed over 58,000 online businesses. Site Jabber was developed in part with a grant from the National Science Foundation.
  2. BBB report. For over 100 years, BBB has set the standard for ethical business behavior. We're proud to maintain an "A to A+" rating. This rating takes into account a company's size in its relation to complaints. We're proud to maintain an "A to A+" rating. We've been accredited since March 15, 2004
  3. Prodex Insulation Reviews on every product page
  4. Over million orders totaling more than 4 billion square feet of insulation sold.

Insulation4Less Reviews Some review sites are pay to play :(

Updated February 24, 2020




See independent Prodex and Insulation4Less reviews on Site Jabber

ccerino: Thursday, March 24, 2016
Well the installation went fine. It’s fast and easy. Rolled it out and laid the grid steel on top and then attached the PEX tubing….We poured the floor a week ago. The building goes up this Saturday.



Customer Reviews
gimpleg: Tuesday, May 10, 2016

I can really tell a big difference inside my building and a friends that has no insulation under the floor. Just that installation of Prodex under the floor has been a big improvement compaired to others. Thank you


Prodex Insulation Reviews
accutrol: Wednesday, October 26, 2011
My name is John and I am an HVAC contractor in Lexington, Ky. I have been using your Prodex product for a few years now and a I just wanted to let you know that it is a fabulous product. Makes my job a lot easier and look so much more professional than using a blanket fiberglass wrap. I use it as a duct wrap for residential and commercial installations. I also use it as an insulation barrier for the radiant floor installations that I do.



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