Is an R-value of 8 realistic?

Only when the foil faces an open air space of about 3/4 inch or more. Stapled flat against drywall or sheathing, the effective R-value is much lower, closer to the bubble's own thin resistance.

Can I use it on windows?

Yes, cut to size and pressed or taped against the glass. It blocks light completely, so it suits garages, rentals and daytime heat control rather than living-room windows you want to see through.

Does it replace fiberglass or foam insulation?

No. It is a radiant barrier and works alongside bulk insulation. In cold climates, rely on fiberglass, cellulose or foam board for the main R-value and use this to cut radiant gain.

How much area does one roll cover?

A 2 ft by 10 ft roll covers 20 square feet. A typical one-car garage ceiling needs several rolls, so measure before ordering.

Is it safe around electrical wiring?

Keep the foil from contacting exposed wiring and outlets. The metalized surface conducts, so avoid stapling through cables and check local code for attic installations.

Prices on this type of roll move little, but fall stock and spring pre-summer sales are the usual low points. At $17.76 at Walmart as of November 4, 2026, it is already near the low end for a 20-square-foot roll.

Where can I buy the Double Reflective Bubble Foil Insulation Foam?

2 stores we checked sell it, including Amazon, Walmart.

TWCUSEP

Double Reflective Bubble Foil Insulation Foam

Best price now

$26.99at AmazonObserved at 3:43 PM

Prices are checked against each store and labelled with when.

Visit Amazon

TWCUSEP

Double Reflective Bubble Foil Insulation Foam

Best price now

$26.99at AmazonObserved at 3:43 PM

Prices are checked against each store and labelled with when.

Visit Amazon

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Our take on the Double Reflective Bubble Foil Insulation Foam

This is a 2 ft by 10 ft roll of double-sided reflective bubble foil, sold as a radiant barrier with a stated R-value of 8. Foil on both faces reflects radiant heat while the bubble core adds a thin air gap, so it works best as a supplement to bulk insulation rather than a replacement. At $17.76 at Walmart as of November 4, 2026, it is a low-cost way to try a small area before committing to a larger job.

Best forAttic rafters and garage ceilingsWindows and doors in hot climatesBasement rim joists and wallsRenters and DIY patch jobs

Pros

Foil on both sides reflects radiant heat in either direction
Light and easy to cut with scissors or a utility knife
Waterproof and tear-resistant for a thin material
Small 2 ft by 10 ft roll suits tight spaces and testing
Cheap entry point at $17.76 at Walmart

Cons

Stated R-value of 8 assumes an air gap; compressed or sandwiched it drops sharply
Bubble foil does little against conductive heat loss in cold climates
Foil surfaces tear and crease and can short against wiring if stapled carelessly
Only 20 square feet per roll, so full attics need many rolls

Double Reflective Bubble Foil Insulation Foam prices at every store

AmazonNew
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$26.99Observed at 3:43 PM
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WalmartCheck price at Walmart

Double Reflective Bubble Foil Insulation Foam price history

Lowest price we've seen: $26.99 on Nov 4 at Amazon. Tracked across 1 store since Nov 4.

What reviewers say

Radiant barrier bubble foil of this type is generally seen as a quick, inexpensive supplement. Owners report it noticeably cuts heat radiating through windows and garage ceilings, but note the foil is fragile and the R-value claim only holds with a proper air space.

Pros

Noticeable reduction in radiant heat at windows and doors
Easy to cut and staple
Holds up to damp basements

Cons

Foil tears easily during installation
R-value overstated when installed flat against a surface
Small roll size means buying several for a full attic

About the Double Reflective Bubble Foil Insulation Foam

The NASATEK® Single Foil/Foil Reflective Insulation is the most versatile, widely-distributed, energy-efficient product that we manufacture. The characteristics that make it so attractive include ease-of-handling and installation, more than 40+ commercial and residential construction applications, and a large selection of product configurations to accommodate the vast majority of applications / buildings. Distribution of our Double Reflective Insulation is worldwide through Do-It-Yourself Retailers, Contractor Sales Groups and Industrial / Commercial Building Products Suppliers.

Specifications

color: SilverSource
size: 2' x 10'Source
Thermal Type: Blanket
Type: Reflective Type
Reflective Type: Radiant Barrier
Width: 12INCHSource

Questions and answers

Is an R-value of 8 realistic?: Only when the foil faces an open air space of about 3/4 inch or more. Stapled flat against drywall or sheathing, the effective R-value is much lower, closer to the bubble's own thin resistance.
Can I use it on windows?: Yes, cut to size and pressed or taped against the glass. It blocks light completely, so it suits garages, rentals and daytime heat control rather than living-room windows you want to see through.
Does it replace fiberglass or foam insulation?: No. It is a radiant barrier and works alongside bulk insulation. In cold climates, rely on fiberglass, cellulose or foam board for the main R-value and use this to cut radiant gain.
How much area does one roll cover?: A 2 ft by 10 ft roll covers 20 square feet. A typical one-car garage ceiling needs several rolls, so measure before ordering.
Is it safe around electrical wiring?: Keep the foil from contacting exposed wiring and outlets. The metalized surface conducts, so avoid stapling through cables and check local code for attic installations.
When is it cheapest?: Prices on this type of roll move little, but fall stock and spring pre-summer sales are the usual low points. At $17.76 at Walmart as of November 4, 2026, it is already near the low end for a 20-square-foot roll.
Where is the Double Reflective Bubble Foil Insulation Foam cheapest?: At Amazon, for $26.99, as of our latest check.
Where can I buy the Double Reflective Bubble Foil Insulation Foam?: 2 stores we checked sell it, including Amazon, Walmart.