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Bubble Foil Insulation from EcoFoil
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Floor Joist Insulation - 24" x 125' (250 sq. ft.)

Floor Joist Insulation - 24" x 125' (250 sq. ft.)

SKU: EF2222-24-125
Regular price $129.00
Regular price Sale price $129.00
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Ships Apr 24 when you order now

Product details:

EcoFoil Floor Joist Insulation is constructed of a double layer of polyethylene bubble insulation bonded to two radiant barrier metalized sheets. This (1/4" to 5/16") thick insulation provides superior protection against radiant heat transfer and also provides an effective vapor barrier, preventing condensation which can cause mold. Bubble insulation is rated by its high reflectivity of 96%, and low emissivity of 4%. This means only 4% of radiant heat passes through the insulation. Simply put the insulation is not trying to slow the way heat passes through it, the insulation is trying to eliminate heat from passing through it.

This insulation is designed to fit in between either a studded wall or floor joists that are 24" on center. The 24" wide insulation is lightweight and includes a 3/4" flat staple tab on each side for easy installation.

R-Value Of Radiant Barriers

Rather than rating by R-value, all radiant barrier products are measured by their reflective and emissive properties. EcoFoil double bubble 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.  


Ecofoil Floor Joist insulation is made from a double layer of polyethylene bubbles, sandwiched between two highly reflective surfaces with a metalized coating. Pre-cut to 16” or 24” width. Staple tabs on both edges allow easy attachment to joists or wall studs. 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.

10-year limited warranty:

This product carries a manufacturer’s 10-year limited warranty against material defects, including but not limited to de-lamination, surface imperfection, foil corrosion, and air retention. Please note: this warranty does not necessarily cover defects due to improper installation, natural disasters, normal wear and tear, or exposure to chemicals and gasses. View Manufacturer Warranty

Shipping Info:

This product ships FREE via FedEx Ground. Products ship same-day on orders received before 4pm CT and are typically delivered within 2-5 days. Expedited shipping options available. Call us at 888.349.3645 or contact us for more information on shipping options.


24 in x 125 ft (250 square feet per roll)

~1/4" thick

Installation Tips:

Convenient staple taps along each edge make for easy installation under floor joists or between wall studs.

Spec Sheets: Download Spec Sheet
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Bubble Foil Insulation from EcoFoil
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Customer Reviews

Based on 13 reviews
Worked perfectly!

As advertised! Product was easy to work with and installation was easy.

joseph berry

Used in a crawlspace to update a customer's existing insulation worked well and easy to install

Diane Deal
Floor Joist Insulation

My guys said this was so easy to install. Will probably use for other projects as we move forward

Big Difference

Installed was easy, used my staple gun. Staple tabs made it easy. Material was stronger than I thought it would be. Have only had a few hot days and noticed a big difference in temperature in my wood shed.

randy miller


    Floor Joist Insulation - 24" x 125' (250 sq. ft.)

    Frequently Asked Questions

    Are the staple tabs factored into the overall width of the product?

    The 3/4" staple tabs are included in the width listed for the product. Including the tabs, the overall width is 16" or 24". These widths allow for easy attachment to joists that are 16" and 24" on center.

    What do the bubbles do?

    The layer of bubbles provides a thermal break between hot and cold air, and helps eliminate condensation from forming in your structure. Double Bubble has two layers of bubbles for extra condensation prevention. Double Bubble Reflective Insulation is typically used in the northern states where temperature differences inside vs. outside your structure are extreme, typically during cold, frigid winters.

    How much tape do I need?

    1 roll of tape will be needed for every 500 sq ft of reflective insulation. It's important to tape the seams between adjoining sheets—never use tape to attach the product directly to your structure. Taping the seams creates a vapor barrier when installed properly, and helps ensure the reflective properties of the insulation.

    Which tape do I choose?

    Is between joist insulation available in a white finish?

    At this time, Between Joist Insulation is only available in a Foil/Foil finish. If you'd like a White/Foil option added to our catalogue, please let us know by calling 888.349.3645 or filling out this form. In the mean time, if you'd like a white finish you could cut down a 48" roll of White/Foil Double Bubble to size, which is essentially the same product but without staple tabs.

    How do I install Between Joist Insulation?

    In most cases, Between Joist Insulation can be installed with a staple gun directly to the joists. The staple tabs make this process easy when joists are spaced by 16" or 24". Complete installation instructions can be found on this page.

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