• Reflective insulation reflects heat upwards

    Redirects heat upwards

  • save money on energy bills

    Energy efficient

  • Reflective insulation installs easily

    Easy to install

warm floor walking barefoot

Reflective Insulation under Radiant Floors will save you money

Radiant floors will naturally push heat in all directions. For maximum efficiency in a radiant floor, it's always wise to direct this heat upward towards the floor. The best way to redirect radiant heat is with EcoFoil Reflective Insulation.

See how it works

Redirect radiant heat back up to your floor

Radiant floors can be an expensive, yet worthwhile, investment. With rising electric costs, it's more important than ever to take the necessary steps to ensure maximum efficiency in your radiant floor system.

Recommended products: Bubble Foil Insulation

radiant floor reflective insulation, different sizes and colors

EcoFoil offers a variety of radiant floor insulation solutions

Under Joists

If you're installing a radiant floor on an upper level and there are exposed joists underneath, we recommend 4' Double Bubble Reflective Insulation, available in a Foil/Foil or White/Foil finish.

Between Joists

Install Between Joist Insulation, precut to 16" or 24" widths.

Radiant Floors Under Concrete

For radiant floors in basements, garages, or other outdoor concrete applications, we recommend Ultra CBF Under Slab Insulation. For more information on insulating under concrete, see Under Concrete Slab.

  • Scissors and knife for radiant barrier installation

    Scissors or utility knife

  • staple gun

    Staple gun

  • Insulation tape for radiant barrier

    Tape (under joist application only)

  • Install radiant barrier with 1-2 people

    1-2 people

Radiant Floor Insulation Installation Instructions:

Radiant Heat Insulation (Under Floor Joists)

Radiant Heat Insulation (Under Floor Joists)

Download Instructions (PDF)
Radiant Floor Insulation (Between Joists)

Radiant Floor Insulation (Between Joists)

Download Instructions (PDF)
Radiant Floor Insulation (Between Joists, Above Drywall)

Radiant Floor Insulation (Between Joists, Above Drywall)

Download Instructions (PDF)
Radiant Snow Melt Slab

Radiant Snow Melt Slab

Download Instructions (PDF)
Radiant Floor Insulation (Under Concrete)

Radiant Floor Insulation (Under Concrete)

Download Instructions (PDF)
Radiant Floor Insulation (on top of wood floor)

Radiant Floor Insulation (on top of wood floor)

Download Instructions (PDF)

Radiant Floor Insulation

Why Use EcoFoil Radiant Floor Insulation?

  • Effective in all temperatures - even extreme heat and cold
  • Strong, lightweight, flexible, and safe to handle with no special clothing or equipment
  • Durable and long-lasting
  • Extremely easy to install
  • Easy to cut and staple, nail or glue into place
  • Reflects up to 96% of radiant heat - see How a Radiant Barrier Works
  • Waterproof, non-absorbent surface

More About EcoFoil Radiant Floor Insulation

Radiant floor heating is becoming more common in new home construction. There are many floor insulation options—concrete floor insulation (see our Under Slab Insulation page), under floor insulation, crawl space floor insulation, sub floor insulation, mobile home floor insulation, in floor heating insulation, hardwood floor insulation, insulation between floor joists, floating floor insulation, and even soundproof acoustic floor insulation, to name a few.

There are many aspects to consider with insulation for radiant floor heating. If you’re looking for cost-effective floor insulation or DIY floor insulation, reflective foil is a great option. Radiant floor heating is popular for many reasons: 

  • Sub floor insulation creates a comfortable and warm floor that will have you walking barefoot all winter long.
  • Air quality is improved because radiant heat does not stir dust particles or remove moisture from the air like traditional forced air systems.
  • Radiant floor insulation is safe because it has no surface that could produce burns.
  • Under floor insulation is also unobtrusive and environmentally conscious.

In order to receive all of these benefits of floor insulation, under floor insulation must be installed properly. Radiant heat—by its nature—will want to radiate in all directions, so it's important to use the right radiant floor heating product for your application. If you have any questions about your install, we'd be delighted to help! Send us a chat, call us at 888.349.3645 or fill out the form here.

Radiant Floor Insulation Reviews:

Customer Reviews

Based on 11 reviews
Jeff Schritz
1 winter in the books

I found this product while researching "best methods for in floor heat". This is my first heated slab. We are in Montana and typically get 2wk+ of sub zero weather each winter. This floor system was the only working heat in our shop/house through the winter, as I completed the finish work. Without any air circulation, our building maintained T shirt comfortable temps. with both zones set at 63F.
Installed this foil myself with help from the concrete crew. This product lays tight to the contour of your gravel so you can achieve troughs for thickened edge/mono slabs. We taped the seams with HVAC foil tape and added an additional 1.5" of foam board on top of the foil. I left voids in the foam board and gravel bed for added strength under bearing walls. Resulting in apx 8" thick "mono beams" under the bearing walls. This product held up incredibly well through all of this extra traffic prior to the pour. I've not seen a drop of condensation anywhere on this slab even before the boiler was up and running. Great product! And the scraps work awesome for doghouse and chicken coop insulation.

Paul Zais

fast delivery

Bari Nasary

Ultra CBF Under Slab Insulation - 4' X 75' (300 sq ft)

DL Cameron Construction
Arbor ADU

This reflective material was exactly what the project at hand required

So far , so good

Arrived on time