How does radiator reflector film work?

The aluminized foil reflects radiant heat from the radiator back into the room instead of letting it pass into the wall. The 3 mm cotton layer adds a small insulating barrier. It works best on exterior walls behind the radiator.

Can I cut it to fit my radiator?

Yes. Cut the film to the size of the radiator before mounting it. The roll is 5 m long, enough for several standard panels.

How do I attach it to the wall?

The material has an adhesive backing, and double-sided tape is an alternative. The maker notes tape is less durable. Clean and dry the wall first for a firm hold.

Will it work on windows or in a motorhome?

Yes. The same foil is used for sun-facing windows, conservatories, roofs and motorhome walls. On windows, face the reflective side toward the heat source.

Does it make a room warmer?

It reduces heat lost through the wall behind the radiator, so the room warms faster and the radiator cycles less. Gains are modest if the wall is already insulated.

Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll

Best price now

$10.19at WalmartChecked 1 h ago

Prices are checked against each store and labelled with when.

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Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll

Best price now

$10.19at WalmartChecked 1 h ago

Prices are checked against each store and labelled with when.

Visit Walmart

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Price facts

Lowest price today: $10.19 at Walmart (checked Nov 14, 2026).

Our take on the Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll

This is a 5 m roll of 3 mm thick reflective insulation: aluminum foil bonded to a cotton backing. It mounts behind a radiator to bounce heat back into the room instead of letting it escape through the wall. It also works on containers, motorhomes, windows, conservatories and roofs. It is a simple, low-cost upgrade for cold rooms with wall-mounted radiators, but it only helps where heat is being lost through the wall behind the panel.

Best forCold rooms with radiators on uninsulated exterior wallsRenters who want a reversible, no-drill fixMotorhome, conservatory and roof insulationInsulating containers and other heat sources

Pros

Reflective foil face pushes radiant heat back into the room
3 mm padding adds a thin insulating layer
Cuts to size with scissors for most radiator widths
Also useful on windows, roofs, motorhomes and containers
Moisture, corrosion and ageing resistant

Cons

Adhesive backing is the weak point; tape is less durable
Only helps where heat escapes through the wall behind the radiator
No stated fire rating
Thin 3 mm layer does little for drafty or uninsulated walls

Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll prices at every store

WalmartNew
In stockSold by Seller
$10.19+ $2.99 shippingChecked 1 h ago
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Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll price history

$11.19$10.19

Nov 4Nov 14

Lowest price we've seen: $10.19 on Nov 14 at Walmart; highest $11.19 on Nov 4. Tracked across 1 store since Nov 4.

About the Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll

This is a reflective insulation film made of PET aluminized foil, sold as a roll. It fits any radiator model and can also insulate various containers.

The material is listed as 3 mm thick. It offers thermal insulation, moisture resistance, sound insulation, low friction, aging resistance and corrosion resistance.

Cut the film to the size of the radiator before installing. It attaches with a special adhesive. Double-sided tape also works, but it is less durable.

Material: PET aluminized film
Type: Reflective
Thickness: 3 mm
Sizes: 5 m x 0.98 ft (16.4 ft x 0.98 ft); 10 m x 0.98 ft (32.8 ft x 0.98 ft); 5 m x 0.5 m (16.4 ft x 1.64 ft); 10 m x 0.5 m (32.8 ft x 1.64 ft)
Installation: Special adhesive; double-sided tape also possible
In the box: 1 roll of radiator reflective film

Specifications

Reflective Type: Reflective
color: silver
size: 0.3 x 5 m

Questions and answers

How does radiator reflector film work?: The aluminized foil reflects radiant heat from the radiator back into the room instead of letting it pass into the wall. The 3 mm cotton layer adds a small insulating barrier. It works best on exterior walls behind the radiator.
Can I cut it to fit my radiator?: Yes. Cut the film to the size of the radiator before mounting it. The roll is 5 m long, enough for several standard panels.
How do I attach it to the wall?: The material has an adhesive backing, and double-sided tape is an alternative. The maker notes tape is less durable. Clean and dry the wall first for a firm hold.
Will it work on windows or in a motorhome?: Yes. The same foil is used for sun-facing windows, conservatories, roofs and motorhome walls. On windows, face the reflective side toward the heat source.
Does it make a room warmer?: It reduces heat lost through the wall behind the radiator, so the room warms faster and the radiator cycles less. Gains are modest if the wall is already insulated.
Where is the Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll cheapest?: At Walmart, for $10.19, as of our latest check.

Stores we've priced the Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll at

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Stores we've priced the Radiator Reflective Insulation Film PET Aluminized Foil 5M Roll at

Walmart deals and prices

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