Underfloor heating in the basement - is that useful?

When cellar rooms are converted into living spaces, the question naturally arises of a suitable heating system. Whether a floor heating in the basement is basically, and what you have to consider in terms of insulation, you can read in this post.

floor insulation

The most important thing when installing a floor heating in the basement is the sufficient insulation of the basement floor. If the heat losses are not sufficiently limited, the heating in the basement will be very poor.

The required insulation thickness and the floor structure must be planned and calculated by the expert in any case. Depending on the depth of the basement and depending on the existing floor structure, the thickness of the insulation and the insulation materials must be selected accordingly.

If one converts the regulations of the DIN 4108 accordingly, one will come to some basements to required heat transfer values ​​of 0.35 W / (m²K). This then means insulation thickness of 7. 10 cm insulation at the basement floor.

installation height

The insulation, the heating screed and the entire floor structure lead to a relatively large height in the basement. In individual cases, one must then judge whether the remaining room height is still sufficient and pleasant, or whether it is better to resort to other solutions.

In individual cases, even a thin-layer drying system can be a way to reduce the installation height. In this case, you can save yourself an expensive Heizestrich installation.

This also offers the advantage that no drying time has to be waited for and the screed does not have to be rock-fired. For the subsequent installation of a floor heating such retrofit systems are in most cases better anyway.

Connection to the heating system

If in the rest of the house also underfloor heating are installed, makes the connection of the basement heating to the house system usually no problems. The situation is different when radiator heaters are installed in the rest of the house.

In this case, you should definitely consider with the heating engineer, whether the underfloor heating in the basement is a useful option, and what adjustments to the heating system before the connection will be required.

Calculation of heating demand

Depending on the conditions in the basement a very different levels of heating power for heating the cellar rooms may be required.

In advance, therefore, the heating needs for all basements should be calculated in any case. To consider are:

  • Type and location of the cellar, depth in the soil
  • Construction of the cellar
  • Size of the cellar
  • possibly existing cellar windows
  • planned insulation measures in the basement

By determining the heating demand, it can be ensured that the planned heating is actually sufficient to bring the basement to a comfortable temperature. Many underfloor heating systems are often undersized. Especially in basements, this can be very uncomfortable.

Tips & Tricks

If you want to save the installation effort for rarely used basements, you should also think about an infrared heater. It requires no installation, can heat up rooms within minutes and, with good planning, has a very low power consumption. Especially for rooms that are not constantly used, such as a party room or a guest room or work space in the basement, this can be a very good solution.

Video Board: How to Install DIY Radiant Floor Heating