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Double Bubble for use in Basement, Metal Building, Crawl Space, Tiny Home/Yurt, and Cathedral Ceiling applications

Double Bubble Insulation - White/Foil - 4' X 125' (500 sq ft)

Double Bubble Insulation - White/Foil - 4' X 125' (500 sq ft)

SKU: EF2520-48-125

Most effective at preventing condensation in colder climates

Regular price $199.00
Regular price Sale price $199.00
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EcoFoil Double Bubble Foil Insulation is primarily used in pole barnsmetal buildingsbasement wallscrawl spaces, and storage units located in moderate and colder climates. Double bubble insulation combines the heat-shielding properties of solid radiant barrier with two layers of polyethylene bubbles, which acts as a built-in air gap that reduces contact between temperatures on either side of the product. The double layer of bubbles effectively combats the formation of frost and condensation that can occur when temperature differences are extreme on either side of the material. It's very thin (approximately 1/4"), lightweight, and installs easily with minimal equipment. Our white/foil variety offers the same benefits as foil/foil, but with a white finish that faces towards your finished space, providing a more "finished" look.

A radiant barrier and vapor barrier, all in one product

Not only does Double Bubble Insulation reflect radiant heat, when properly installed with tape it also acts as a vapor barrier, preventing the passage of moisture and other unwanted particles which can cause mold. In order to establish a vapor barrier, you must tape all seams and joints to prevent air passage, keeping moisture and other particles from passing through. 


Radiant barrier vs traditional insulation

Radiant barrier bubble insulation works differently compared to traditional insulation like fiberglass and spray foam.

  • Traditional insulation works to absorb heat and is measured by R-value. The higher the R-value, the thicker the material and the more heat it can absorb. 
  • Radiant barrier bubble insulation, on the other hand, reflects heat back to its source (whether that's your furnace or the sun.)

When used together, these two insulation types can provide a highly effective one-two punch that will keep your building warmer in the winter and cooler in the summer.

R-Value Of Radiant Barriers

Because these two insulation types have different purposes, their effectiveness is measured differently. Rather than rating by R-value, all radiant barrier products are measured by their reflective and emissive properties. When installed properly with an air gap on one side of the product, double bubble insulation will reflect heat away from your building in the summer, and keep heat in during the winter.

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.  

EcoFoil Double Bubble Foil Insulation is not to be used under concrete slabs. For under concrete slab or radiant floor insulation applications, we recommend EcoFoil Under Slab Insulation.


Ecofoil Double Bubble Reflective Insulation is made from a double layer of polyethylene bubbles, sandwiched between two highly reflective surfaces with a metabolized coating. This product is classified as Class 1/Class A in accordance with the ASTM-E84-09 fire test standard. The product was mounted in accordance to ASTM-E2599-08. It is lightweight, durable, and is easy to handle 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)

~1/4" thick

Spec Sheets:

Download Spec Sheet
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Customer Reviews

Based on 40 reviews

This is a great product - why is it not in the major hardware stores? I’ve used double foil products on cellar walls with great results but having a white finish makes it aesthetically better and the wife happy. Someone needs to market this product better.

Brown Brenda
Insulated tin roof

At the hemp farm my porch is the most used room. In the winter it is covered in marine vinyl and plastic, the summer is open and airy. The big problem is condensation. I had to have something that would help to keep the heat in in the winter and out during the summer and not mildew. We just installed this insulation and just had temperatures and 30s, what a wonderful addition to my porch! I was not losing my heat right out of the ceiling, With my fans on you could feel the heat coming back down, I am more than pleased

Callum Hay
Excellent product, easy to use and gives a nice clean look

In my application: had a metal building built in Florida and the builder used single layer bubble on walls and roof. He used the white/foil option and it gave a very professional finish with the white on the interior. I added double bubble to the roof by threading under the purlins and can tell a big difference in interior climate with an extra layer with an air gap under the roof. This product IMO is a great radiant barrier with insulating abilities. Can definately say double bubble is the way to go

David Patrick

It arrived in great condition. I have installed it and am very happy with the effectiveness of the product

Kathy Biel
Shop insulation

The order arrived quickly within a few days. We have an old dairy milk house that we converted into a shop. The wood burning stove had all it could do to try and keep it warm. Now that we have it insulated it makes a dramatic difference. No jackets necessary in the winter. We’re going to purchase again when it comes time when we start working on our barn

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