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Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier

Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier

3.5· 6 ratings

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$18.38at Home DepotObserved at 3:43 PM

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Our take on the Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier

This is a single 40 in x 39.4 in sheet of foil-faced closed-cell foam with a peel-and-stick backing, sold as a radiant barrier. It covers about 10.8 sq ft at 0.2 in thick, so it is a patch-and-spot product rather than a whole-garage solution. At $18.38 at Home Depot as of November 4, 2026, it is the lowest of the two new prices we track; that works out to roughly $1.70 per square foot, which is high for foil foam bought by the sheet.

Best forSmall radiant-barrier patches: garage doors, attic hatches, knee wallsBacking a shed, doghouse or camper panel where glue beats staplesCutting heat off a hot surface behind a water heater or duct runRenters who want removable, no-fastener insulation
Pros
  • Peel-and-stick backing installs without staples or tape
  • Foil face reflects radiant heat and resists moisture
  • Cuts with a utility knife or scissors
  • 0.2 in foam adds a little conduction resistance, not just a shiny surface
  • One 40 in x 39.4 in sheet handles a door panel or hatch
Cons
  • Only 10.8 sq ft per sheet, so larger jobs need many pieces
  • About $1.70 per sq ft is expensive versus rolls
  • Adhesive holds poorly on dusty, rough or cold surfaces
  • Thin 0.2 in foam gives little R-value on its own
  • Few ratings so far, and the average is middling

Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier prices at every store

  • Home DepotNew

    In stock

    $18.38Observed at 3:43 PM
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Also available at

  • eBayCheck price at eBay

Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier price history

Lowest price we've seen: $18.38 on Nov 4 at Home Depot. Tracked across 1 store since Nov 4.

What reviewers say

Only six ratings are on record, averaging 3.5 out of 5, so the picture is thin. Buyers of this type of foil foam generally judge it on adhesion and how well the foil survives cutting and handling.

Pros
  • Foil surface reflects heat as expected in small spots
  • Easy to cut and press into place
Cons
  • Adhesive can lift on dusty or uneven surfaces
  • Small sheet size means buying several for one job

Specifications

Insulation Type
Radiant Barrier
Sheet Or Roll
Sheet
Coverage Area (Sq. Ft.)
10.8 sq ft
Product Length (Ft.)
3.33 ft
Product Thickness (In.)
0.2 in
Product Width (In.)
40 in

Questions and answers

Is this worth it for a whole garage door?
Probably not. One sheet covers 10.8 sq ft, and a standard two-car garage door is around 350 sq ft, so you would need dozens of sheets at about $1.70 per square foot. A foil radiant-barrier roll is far cheaper per square foot for that job.
How does it compare with plain foil bubble wrap?
This is 0.2 in closed-cell foam with a foil face and a sticky back; bubble wrap is thinner, cheaper per square foot and usually stapled. The foam here resists dents and moisture better, but it costs more and covers less per sheet.
Will the adhesive hold on a garage door or attic deck?
Only on clean, dry, smooth surfaces. Wipe off dust and let cold panels warm up first; on rough plywood or dirty metal, plan on adding staples or foil tape at the edges.
What is in the box?
One sheet, 40 in wide by 39.4 in long (3.33 ft), 0.2 in thick, with a peel-off adhesive backing. Coverage is 10.8 sq ft.
Does it add real R-value?
Modestly. The foil blocks radiant heat and the thin foam adds a little conductive resistance, but 0.2 in of foam is not a substitute for batt or board insulation. Use it as a radiant barrier or a supplement, not the main layer.
When is the price lowest?
At $18.38 at Home Depot as of November 4, 2026, it is already the lower of the two new prices we track. Small foil-foam sheets rarely discount deeply, so watch for store-wide insulation sales rather than waiting on this item alone.
Where is the Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier cheapest?
At Home Depot, for $18.38, as of our latest check.
What do buyers say about the Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier?
Rated 3.5 out of 5 from 6 ratings.
Where can I buy the Wellco 39.4 in x 1.33 ft Self-Adhesive Aluminum Foil Reflective Insulation Foam Radiant Barrier?
2 stores we checked sell it, including Home Depot, eBay.

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