How It Works: Laying Low Profile Underfloor Heating

Installation guidelines

To demonstrate the ease of installation, we have carried out a demo installation of the underfloor heating with clip-on rails and documented it with pictures in these instructions. Detailed installation instructions can be downloaded at the bottom of the page and are included with each heating kit.

The FLEXIRO low-profile underfloor heating is a system kit that has been put together for easy retrofitting of the existing heating system and subsequent installation in individual rooms such as bathrooms or kitchens. Compared to conventional underfloor heating systems, the use of the thin and flexible 10 mm plastic composite pipe ensures a low installation height, even heat distribution and maximum flexibility in planning.

The retrofit installation of the underfloor heating is simplified by the use of plug-in connections and RTL boxes for control and connection to the heating system, making FLEXIRO equally suitable for DIY enthusiasts.

Underfloor heating version with clip rails

Planning of the installation
Checking the installation
Completion of the underfloor heating system

To conclude

Despite the simple design of the underfloor heating system and the ease of installation, we must point out that, as the manufacturer, we can only guarantee correct delivery from the factory and not installation and connection by third parties. Please also observe the current standards and regulations for heating systems.

The most important installation steps are also shown in our animated video.

FLEXIRO wishes you a successful installation!



The Bostik company says yes! However, floating timber structures are not permitted as they are highly susceptible to deformation. Installation is therefore only possible on fixed timber structures, whereby these must be uncoupled. Please contact us for further information on laying on fixed timber structures!

The existing substrate must always be level, clean, dry and load-bearing.

FLEXIRO underfloor heating can be installed on OSB boards. Bostik's instructions clearly state that the OSB boards must be bonded to the substrate. Floating OSB boards are not suitable. The OSB boards must be primed before laying the FLEXIRO underfloor heating. In this case, the pipes should be covered with at least 5 mm of screed.

Due to the installation of the low profile underfloor heating directly below the surface, additional insulation is not required in most cases. This keeps the installation height low. Exceptions are floors above unheated basements and the ground. The requirements of the Energy Saving Ordinance must be observed. Further information on thermal insulation for underfloor heating

The low profile underfloor heating is designed for mounting directly on the existing surface. The modernisation of an existing and already insulated floor usually does not require additional insulation of the underfloor heating. Therefore we only sell special insulation boards for bathrooms and other wet areas. Additional floor insulation can be bought at any specialist store. Once the insulation has been applied, you need to ensure a stable surface before installing the underfloor heating.