Underfloor heating on a wooden beam ceiling - is that possible?

Especially in the upper floor, conventional, estriche-embedded underfloor heating often can not be realized because of the high weight. Whether you can generally install underfloor heating on a wooden beam ceiling, where you have to be careful and which systems are suitable, read here.

Possibilities of construction

Beamed ceilings can not usually carry a complete screed structure. In addition, this would in many cases also cause additional problems with the height and the remaining room height.

Especially in the attic you should make sure as possible, despite the installation of underfloor heating to keep the door heights as possible.


What you should think about, is a sufficient insulation under the floor heating. If the insulation is insufficient, too much heat will be lost towards the bottom instead of radiating upwards into the room. The performance of the underfloor heating is thereby massively impaired.

In order to keep the installation height as low as possible, it is recommended to use very thin, but high-quality insulation layers. In addition, you should absolutely insulate the spaces between the wooden beams with suitable material (for example Neopor).

For many beamed ceilings in the old building you have to previously remove the slag fill between beams, but this is usually no problem. In any case, the interstices should be completely and effectively filled with suitable material.

Suitable systems

Above all, drying systems are suitable for retrofitting. With regard to the situation in the attic, thin-bed underfloor heating systems are often a good choice.

Decisive here but also the respective heating demand and the required performance of the system. That should influence the choice above all else - because a floor heating which does not provide enough power, subsequently only provides for little well-being.

Systems based on dry screed

For the construction various systems have been established in the market. A very interesting solution in terms of weight is certainly dry construction elements. They are also easy to lay yourself, and are also priced in a reasonable frame.

Flooring screed in the attic

If it is possible by weight (statics!) You can certainly bring in a floating screed on the beamed ceiling. It should be noted - in addition to the high weight load - the required screed height. A minimum coverage of the heating pipes of not less than 15 mm must be given in any case.

By way of example, the structure could look like this:

  • joists
  • OSB boards, 24 mm thick, screwed to the beams (leveling layer)
  • Special primer
  • Mat as a carrier material for the heating pipes
  • Tube
  • Flooring screed with at least 15 mm covering of the pipes

Such a structure is also permissible from a technical point of view. The construction height in this case is about 50 mm from the beam position.

If an additional insulation is installed (insulation under the screed), the thickness of the insulating material is added in addition to the specified construction height.

Tips & Tricks

In any case, you should discuss the planned structure with the respective professionals in detail, and also not forget to let determine the carrying capacity of the beam ceiling statically in case of doubt. For this purpose, a calculation of the given heating requirement and the necessary characteristics of the underfloor heating system should be carried out unconditionally.

Video Board: Installing Radiant Heat Between Joists-by Radiantec