Radiant Floor – Concrete Slab


Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer.

For the Do-It-Yourselfer, Reflectix® has an insulating upgrade available for a Radiant Floor System installed in a Concrete Slab; our specially designed Concrete Slab Insulation product. The addition of this product into a Radiant Floor project will result in a higher level of energy efficiency and a more even floor surface temperature. The bonus characteristic to this product is how easy it is to handle and install.

Recommended Products

Concrete Slab Insulation

Concrete Slab Insulation, White/Reflective/Bubble/Bubble – Roll

  • DBWEF48050 (48” x 50’)
  • DBWEF48100 (48” x 100’)


  • R-1.1
  • Reduces annual energy costs of the system
  • Enhances even heat distribution across floor surface
  • Installs quickly and easily
  • Non-toxic / non-carcinogenic
  • No nesting characteristics for insects
  • Reduces heat loss due to groundwater
  • Vapor retarder and radon barrier

Installation Instructions

Installation Instruction pdf: DIY Rad Fl Con Slab CSI Revised 022024

  • Unroll the Reflectix® Concrete Slab Insulation product over the base material prior to pouring the concrete.
  • Butt the seams of the product and seal with 3” wide poly tape. Note: Utilize a flat edge taping tool to assure good adhesion on all tape.
  • Install Radiant Floor System per manufacturer’s specifications.


Review These Important Safety Guidelines Prior to Installation:

  • ALWAYS check local building codes before installing Reflectix®.
  • ALWAYS use eye protection.
  • Please Note: The intention of these Installation Instructions and 3-D renderings are for the sole purpose of illustrating the correct location and relative position of the Reflectix® products in specific building assemblies. The correct construction methods and techniques are the responsibility of the installer or contractor. The methods outlined are recommendations on location of the Reflectix® products as a guideline. There are no claims on the part of Reflectix, Inc. that these building assemblies are finite standards or meet building code requirements (as they can vary by region).

Testing and Certification

Reflectix® products are thoroughly tested at either nationally approved, independent laboratories or leading universities. Tests are performed to current American Society of Testing and Materials (ASTM) standards when a standard exists. To obtain a copy of our Product Testing Specifications, please refer to the “Additional Resources” tab. The documents are also available by e-mail at or call (800) 879-3645.


Pictured: 1. Concrete Slab Insulation, 2. Product Close-up