Is the R-25 rating realistic?

R-25 is the claimed value for the 20mm foam core. In a wall or door assembly, performance depends on air gaps, sealing the edges and the rest of the assembly, so treat R-25 as a best case.

How much does the 48-inch by 10-foot roll cover?

It covers about 40 square feet at the full 4-foot width. A single-car garage door is roughly 7 by 8 feet, so one roll covers most of it.

Does it need a vapor barrier?

No. The foil facing has a permeance of 0.011 perms, which makes it impermeable to water vapor. Tape the seams so moisture cannot get behind it.

Can it go on a garage door?

Yes, that is its most common use. Cut panels to size, leave the door's hinges and springs clear, and check that the added weight does not strain the opener.

Is it fire safe indoors?

It carries a Class A rating under ASTM E84 with E2599 mounting. Check local code before using it on walls inside a living space.

Only one store lists it new at $129.95 as of November 4, 2026, so there is no competing price to wait for. Watch for roll-size discounts instead.

What do buyers say about the SmartSHIELD Reflective Foam Insulation Roll?

Rated 4.9 out of 5 from 29 ratings. Buyers like: Excellent quality and works well; thick and of great quality; Stays cool to the touch after sun hits the garage door; Easy to work with. Common complaints: No instructions included.

SmartSHIELD Reflective Foam Insulation Roll: lowest price $129.95 at Insulation MarketPlace

Q: Where is the SmartSHIELD Reflective Foam Insulation Roll cheapest?

At Insulation MarketPlace, for $129.95, as of our latest check.

What reviewers say

Owners rate it 4.9 out of 5 from 29 ratings. Most use it on garage doors and report the door stays cool after sun hits it. The main complaint is that no instructions are included.

Pros

Garage door stays cool to the touch in sun
Thick, good quality material
Easy to cut and work with
No itch or mess compared with fiberglass

Cons

No instructions included
Few reviews, mostly garage door use

From Insulation MarketPlace

Closed-cell polyethylene foam between an engineered foil and a white plastic film
Blocks 95% of radiant energy and reduces heat transfer
Non-toxic, non-carcinogenic materials, safe for hot and cold climates
0.8-inch (20mm) thickness with an R-25 value
Lightweight, flexible and easy to install; bends around corners and fits tight spots
Tear-resistant, waterproof and resistant to mold growth

Sizes: 48" x 10ft, 48" x 25ft, 48" x 125ft
Materials: Closed-cell polyethylene foam core with engineered foil layers on both sides and a white plastic film
Fit: 48" x 10ft roll
Guarantee: 10 years warranty; 60-day money-back guarantee
Returns: 60-day money-back guarantee
Shipping: Same day FREE shipping
In the box: Comes in a compact roll for easy handling