Reflective Foil Insulation Sheet

Our take on the Reflective Foil Insulation Sheet

This is a 48-inch by 10-foot roll of double-layer reflective foil insulation: foil faces over an inner polyethylene layer, sold as a radiant barrier for RVs, windows, roofs and garage doors. The package includes 132 pairs of self-adhesive pads for mounting. It ships folded, so expect creases when you unpack it. At $11.60 at Walmart as of November 4, 2026, it is the lowest of the two new prices listed, a low entry point for a small radiant-barrier project.

Reflective Foil Insulation Sheet prices at every store

Reflective Foil Insulation Sheet price history

Lowest price we've seen: $71.98 on Nov 4 at The Home Depot. Tracked across 1 store since Nov 4.

Questions and answers

Is this worth it compared with foam board insulation?

For blocking radiant heat at a window, roof or garage door, a foil barrier like this costs far less than foam board. Foam board adds conductive insulation, which this sheet does not. Use it where you mainly need to reflect heat, not where you need thickness.

How much area does one sheet cover?

One sheet is 48 inches wide by 10 feet long, about 40 square feet. Measure your window, door or joist bay before cutting, and buy more than one sheet if the area is larger.

Can I cut it to fit RV windows?

Yes. Cut it slightly oversized with scissors or a utility knife and press it flat against the glass or frame. The included adhesive pads let you mount it without drilling.

Will the creases from folding come out?

Creases are normal because the sheet ships folded. Laying it flat in a warm room or weighting the corners for a day helps, but some fold lines may stay, which matters most on visible window panels.

Does it work on a garage door?

Yes, it is commonly used as a radiant barrier on garage door panels. Clean and dry the panel first so the adhesive pads stick, and check that the door still closes with the sheet in place.

When is the price lowest?

At $11.60 at Walmart as of November 4, 2026, it is already the lower of the two new prices listed. Small foil sheets like this move little in price, so waiting rarely saves much.

Where is the Reflective Foil Insulation Sheet cheapest?

At The Home Depot, for $71.98, as of our latest check.

Where can I buy the Reflective Foil Insulation Sheet?

2 stores we checked sell it, including The Home Depot, Walmart.

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Buying guides that pick the Reflective Foil Insulation Sheet

• Best self-adhesive foil insulation