What does the R8 rating mean here?

The R8 figure assumes the reflective faces sit against a dead-air space. Installed flat against a surface with no gap, the panel performs far below that number.

Can it be used on a garage door?

Yes. The lightweight foam and staple-friendly face suit garage door panels, and the black vinyl side can face the interior.

Yes. It is listed as Class 1/Class A and tested to ASTM E84 and ASTM E2599.

Does it replace fiberglass batts?

No. It blocks radiant heat but adds little conductive insulation, so it works best over or alongside bulk insulation.

A utility knife or heavy shears cut the foam core cleanly. Score the film first for straighter edges.

The vinyl face is waterproof, but seams and edges should be taped so water does not reach the foam core.

TWCUSEP

Reflective Black Insulation Roll Foam Core Radiant Barrier R8

Best price now

$14.88at WalmartChecked Nov 12

Prices are checked against each store and labelled with when.

Visit Walmart

TWCUSEP

Reflective Black Insulation Roll Foam Core Radiant Barrier R8

Best price now

$14.88at WalmartChecked Nov 12

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Last seen at $14.88 at Walmart on Nov 12.

Our take on the Reflective Black Insulation Roll Foam Core Radiant Barrier R8

This is a 2 ft by 4 ft panel of closed-cell foam sandwiched between two metalized aluminum polyester films, with one face coated in black waterproof vinyl. It reflects about 97% of radiant heat and carries a Class 1/Class A fire rating from ASTM E84 testing. It is aimed at garages, sheds, attic spaces and metal buildings where a thin, staple-friendly barrier is wanted rather than bulk fiberglass. Against fiberglass batts it is thinner and easier to handle, but it offers no sound absorption and little conductive insulation on its own.

Best forGarage doors and metal building wallsAttic radiant barrier over existing insulationDIYers who want a lightweight, staple-friendly panelSpaces where fiberglass batts are awkward to fit

Pros

Reflects about 97% of radiant heat
Class 1/Class A fire rated to ASTM E84
Closed-cell foam holds staples without tearing
Waterproof black vinyl face
Lightweight and does not compress or crumble

Cons

Small 2 ft by 4 ft panels mean many seams
No meaningful sound dampening
R-value depends on an air gap and installation
Vinyl face can be scuffed during handling

Reflective Black Insulation Roll Foam Core Radiant Barrier R8 prices at every store

WalmartNew
In stockSold by TWCUSEP SUPERSTOREReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
$14.88Free shippingChecked Nov 12
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About the Reflective Black Insulation Roll Foam Core Radiant Barrier R8

This insulation roll is a radiant barrier with a foam core. A single layer of closed-cell foam is bonded between two layers of highly reflective metalized aluminum polyester film. One side is coated with a black vinyl that is waterproof and rated ASTM Class 1 / Class A for fire.

It reflects 97% of radiant heat and emits less than 3%. It is lightweight but durable, and it holds staples without tearing. It does not compress, collapse or disintegrate.

The radiant barrier has passed the ASTM E84 and ASTM E2599 tests.

Color: Black
Size: 2' x 4'
Core: Closed-cell foam
Facing: Metalized aluminum polyester film on both sides of the core
Coating: Waterproof black vinyl on one side
Fire rating: ASTM Class 1 / Class A
Radiant heat: Reflects 97%, emits less than 3%
Tests passed: ASTM E84, ASTM E2599

Specifications

color: BlackSource
size: 2' x 4'Source

Questions and answers

What does the R8 rating mean here?: The R8 figure assumes the reflective faces sit against a dead-air space. Installed flat against a surface with no gap, the panel performs far below that number.
Can it be used on a garage door?: Yes. The lightweight foam and staple-friendly face suit garage door panels, and the black vinyl side can face the interior.
Is it fire rated?: Yes. It is listed as Class 1/Class A and tested to ASTM E84 and ASTM E2599.
Does it replace fiberglass batts?: No. It blocks radiant heat but adds little conductive insulation, so it works best over or alongside bulk insulation.
How do I cut it?: A utility knife or heavy shears cut the foam core cleanly. Score the film first for straighter edges.
Can it get wet?: The vinyl face is waterproof, but seams and edges should be taped so water does not reach the foam core.
Where is the Reflective Black Insulation Roll Foam Core Radiant Barrier R8 cheapest?: At Walmart, for $14.88, as of our latest check.