A man in a red sweater and jeans installs foil insulation behind a radiator using tesa tape. A snowy scene is visible outside the window, and the room has blue walls with white curtains. (This text has been generated by AI)

Radiator Insulation

There are many areas in a home where heat can be lost due to poor insulation. One of the most common is the wall directly behind the radiator. With our insulation radiator reflection foil, you can effectively insulate this area. The foil reflects heat back into the room, helping to maintain a comfortable indoor temperature.

tesa® INSULATION Reflective Foil

The tesa® INSULATION reflective foil is an efficient solution for insulating the wall behind your radiator. It reduces heat loss, thereby improving your living environment. Easy installation.

  • Aluminum-coated heating foil made of polyethylene foam
  • Efficiently utilizes radiator heat
  • Easy installation behind the radiator

Efficient Radiator Insulation – with Reflective Foil from tesa®

If rooms don’t warm up properly despite the heating being on, it’s often due to heat loss through the wall behind the radiator. This is especially noticeable in older buildings or poorly insulated walls. A simple and effective solution: the insulation reflective foil for radiators.

The aluminum-coated surface reflects the heat back into the room, while the polyethylene foam provides additional insulation. The foil is installed behind the radiator – with no major effort or structural changes required. This keeps the warmth inside and the cold air out. Ideal for a comfortable indoor climate.

Applying Radiator Reflector Foil: Step-by-Step Guide

01Measure Radiator and Brackets

Note the total width of the radiator and the position of the brackets. Often, you can simply measure the width of the bracket. Then, you only need to mark the distance from the top of the radiator to the bracket.

02Cut Reflector Foil

You can easily cut the reflector foil. This allows you to customize the insulation to your radiators so that nothing protrudes behind the radiator.

03Apply Reflector Foil

Now you can slide the reflector foil behind your radiator. This quickly you have more time to enjoy a pleasantly warm apartment. To avoid mold, the reflector foil should not lie directly against the wall.

Frequently Asked Questions and Answers about Radiator Reflector Foil

Especially in radiator niches, as found mainly in old buildings, a reflection foil can be useful. Often the outer wall is poorly insulated here, and much of the heat is lost directly. A reflection foil reflects the heat into the room and prevents cold air from entering through the wall.

On one side, the aluminum coating of the reflection foil ensures that the heat from the radiator is reflected into the room. On the other side, the polyethylene foam prevents cold air from entering the room. The reflection foil acts both as insulation and as a barrier. Heat often escapes through the wall directly behind the radiator. Here, the radiator reflection foil offers an effective and simple alternative to extensive renovation.

You can easily install your radiator reflection foil in just three steps. First, measure the width of the radiator and the position of the brackets. Then you can cut the reflection foil to size and slide it behind the radiator. This way, heating costs can be reduced quickly.

Mold can form if the radiator reflection foil is directly against the wall. Then the air behind it cannot circulate properly, and mold appears. For this reason, you do not need any fastening materials for our radiator reflection foil.

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Last updated on Sep 24, 2026