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Radiant Barrier for use in Basement, Cathedral Ceiling, Crawl Space, Floor Joist, Metal Building, and Radiant Floor applications

Solid Radiant Barrier Foil - 4' x 125' (500 sq ft)

Solid Radiant Barrier Foil - 4' x 125' (500 sq ft)

SKU: EFM4800-48-125SOLID

For walls, roofs, floors and crawl spaces that require a vapor barrier

Regular price $87.00
Regular price Sale price $87.00
Sale Sold out


EcoFoil Solid Radiant Barrier uses reflective technology to increase the energy efficiency and comfort level of your home. A radiant barrier is made of a thin layer of woven polyethylene which is sandwiched between two layers of a highly reflective metalized coating. With the polyethylene core the product cannot be ripped or torn. It blocks 96% of radiant heat transfer, helping keep your home cooler in the summer and warmer in the winter.

The radiant barrier also acts as a vapor barrier when the seams are taped, keeping moisture from passing through it. EcoFoil Solid Radiant Barrier can be used in walls, roofs, floors and crawl spaces that require a vapor barrier. An easy way to install would be to run the product perpendicular to your framing and staple into place. For new construction this product would be installed under your sheathing to keep radiant heat out during the summer months and radiant heat in during the winter months. For existing homes this product works great in crawl spaces; simply staple radiant barrier to the bottom of your joists, keeping the heat inside your living space which will prevent condensation and the possibility of mold from forming on the joists or subfloor.EcoFoil Solid Radiant Barrier can also be used inside the home on the bottom of the subfloor or joists to keep heat contained either up or down, much like zone heating with an HVAC system. If you have a special application that you have questions on please call our product specialists at (888) 349-3645.

R-Value Of Radiant Barriers

Rather than rating by R-value, all radiant barrier products are measured by their reflective and emissive properties. EcoFoil radiant barrier insulation is 96% reflective and 4% emissive, meaning the product only allows 4% of radiant heat to pass through. 

There are some companies out there posting big R-Value numbers for their radiant barriers, but those numbers are rating the entirety of the system—including the product, air gap, and other building materials. In reality, most radiant barriers by themselves have little to no R-Value. If you need to satisfy a building code of a specified R-Value, we recommend the use of a traditional insulation in conjunction with our radiant barrier in order to meet code. For more information on R-values, see our How It Works page or contact a member of our friendly service team via chat, by calling (888) 349-3645, or using the form here.  

Important - You must use 3" Foil Tape on the seams of the material to ensure the product acts as one sheet and maintains the moisture barrier.


Made of a thin layer of woven polyethylene which is sandwiched between two layers of a highly reflective metalized coating. The material is very durable, tear-resistant, easy to work with and install.

Shipping Info:

EcoFoil ships free via FedEx Ground. Products ship same-day on orders received before 4pm CT and typically arrive between 1-4 days. Expedited shipping options available. Call us at 888.849.3645 or contact us for more information on shipping options.


48 in x 125 ft (500 square feet per roll)

less than 1/64" thick

Spec Sheets:

Download Spec Sheet
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Customer Reviews

Based on 15 reviews
Josh Black
Good product

This stuff is much stronger than I was expecting.

Ken Ludeke
Great Product, Wonderful Service

Have purchased eco foil on many occasions for our nordic sauna projects and it's always worked out wonderfully.

Jeff Welch
Hydronic staple-up application

I needed a foil barrier to use as part of a system to insulate beneath a hydronic radiant floor. Was able to easily cut this 4’ roll into 16” sections (chop saw) so I could place the radiant barrier 2” beneath the hydronic and between the floor joists. Love this product! Very easy to work with and the best option I could find for application. Don’t know why, but I’m hoping I have a little left over after my project. It’s just the kind of stuff that I’m sure I’ll find other uses for.

Kerry Gregory
Great product

Just as described. It was easy to install arrived quickly. Great price. I would recommend this product.

Solid material

I was impressed with how well the ecofoil held up during installation. We expected something much more fragile, but ended up with basically zero wasted material without even being super careful. Highly recommended!

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