This Is How It Works: Do-it-yourself Ceiling Heating with Ready-to-install Drywall Panels

Installation instructions

Radiant ceiling heating provides natural thermal comfort at comparatively low heating costs. In order to provide this thermal comfort in old buildings or in modernisation projects, a water-bearing ceiling heating system can be retrofitted in dry construction in just a few steps. Our 3 m² test installation shows exactly how this can be done.

It is based on our ceiling heating kit for heating areas from 2.9 to 11.6 m². The installation is carried out using suspended dry construction elements, into which the 10 mm PE-RT heating pipes have already been incorporated at the factory. The use of plug-in connections and RTL valves to connect to all common heating systems enables tool-free installation and makes retrofitting the DIY ceiling heating an interesting project for do-it-yourself enthusiasts. Detailed installation instructions can be downloaded at the bottom of this page and are included with each heating kit.

Installing ceiling heating with pre-fabricated plasterboard

Planning of the installation
Installation check
Completion of the ceiling heating


Yes, it is possible to use the ceiling heating kit for cooling in summer. Sufficient cool water supply is required though. Further details can be found at: How to use a ceiling heating as cooling ceiling. 

If there is an unheated room above the ceiling activated with FLEXIRO and the old ceiling has no thermal insulation or the heat transfer coefficient of the ceiling is unknown, we recommend adding an additional insulation layer. In any case, thermal insulation above the ceiling heating will shorten the reaction time of the heating.

The substructure for the ceiling heating should comply with the dry construction guidelines for suspended ceilings. When using CD profiles and direct hangers, a suspension height of approx. 5 cm can already be sufficient. A small distance to the raw ceiling is also required for the installation of the FLEXIRO connection pipes and plug connections. The dry construction guidelines also permit the use of wooden beams as a substructure for the plasterboard. However, their stability and torsional stiffness is usually less good compared to CD profiles made of metal.

How to turn a FLEXIRO ceiling heating system into a cooling ceiling in the summer trending_flat 4 Possible solutions

  • What water cooling options can be considered?
  • What cooling capacity can be expected?
  • How can the chilled ceiling be controlled?

We provide answers to the most important questions when retrofitting a cooling ceiling.

Retrofit a cooling ceiling