DIY kits for
rooms up to 25 m²
from 649.99 €
For those who prefer a quick and clean installation in dry construction, there is our thin underfloor heating as a dry system.
Our drywall kit with milled gypsum fibre boards with a thickness of 18 mm reduces the effort and time required for the installation of water-based underfloor heating in existing and old buildings compared to the standard method.
The construction can be a single-layer, double-layer or triple-layer system. The single-layer construction requires an already load-bearing, firm and level subfloor. In a two-layer structure, the milled drywall panel is bonded to another layer of dry screed. The thickness of the lower layer depends on the expected load. A three-layer construction with additional insulation between two layers of dry screed has also proven effective when there are special requirements for impact sound insulation and thermal insulation. For more information on the structure, please refer to our installation instructions.
The 10 mm PE-RT heating pipe is flexibly laid at 100 mm distance in the milled grooves of the dry screed panel, which are then sealed with joint filler. The low requirement for filling compound reduces the weight of the underfloor heating system and ensures short drying times. After just one day, work on the new floor can be completed by laying the floor covering.
Like all other FLEXIRO kits, the drywall underfloor heating system connects to the existing heating by an RTL valve is controlled individually. low profile dry system is simple and quick to retrofit and provides comfortable warmth for your home.
Technical data sheet drywall underfloor heating kitHeating capacity and other technical information116 KB
PDF Installation Guide - How to Install Drywall Underfloor Heating KitsComprehensive installation guidelines with all required information for retrofitting a FLEXIRO underfloor heating with ready-to-build dry screed boards.832 KB
Both installation methods allow for the safe and rapid installation of a low-profile underfloor heating system. Whether installing using clip rails or studded panels, it is essential to ensure that the subfloor has sufficient load-bearing capacity beforehand.
Clip rails are screwed to the subfloor and can accommodate unevenness, such as that found in wooden floors. Studded panels allow for flexible installation patterns and reduce the need for levelling compound. Here are the specific advantages of the installation methods in detail:
| Clip-on rail | Studded panel |
| Most cost-effective, simple installation method | The higher costs are partly offset by the reduced need for levelling compound |
| Tolerates uneven floors | Requires a level and dry substrate |
| Fixed with screws | Fixed using adhesive. In addition, a reinforcement mesh is pre-fitted underneath the studded panels at the factory |
| Medium drying time | Short drying time |
| Installation pattern: Meander | Laying pattern: Maximum flexibility. Spiral laying is also possible. |
| Additional dowel hooks are required for tight bending radii | Secure and even support for the heating pipes close to the surface |
The function of heat distribution plates is clear from their name. Thanks to the excellent thermal conductivity of the materials used – usually aluminium or galvanised steel – the plates transfer heat from the heating pipes to the floor surface. This ensures even heat distribution and minimises thermal bridges between the pipes. The use of heat conduction plates increases the energy efficiency and response speed of the underfloor heating system. The required thermal comfort is achieved at a lower heating water temperature, which offers further energy benefits, particularly when used in conjunction with heat pumps.
Heat conduction plates are mostly installed in combination with dry-build systems, as the materials used here, such as gypsum fibre, polystyrene or wood, have lower thermal conductivity compared to wet screed. In standard wet screed systems using screed concrete or cement screed as the casting compound, heat conduction plates are rarely used, as the concrete handles the heat distribution.
Heat conduction plates are also unnecessary for low profile underfloor heating systems, as the thin pipes used here can be laid at close intervals. Furthermore, laying the pipes close to the surface ensures direct heat transfer into the room via the floor covering.
Wet installation
Our 10 mm systems use special studded panels or clip rails to secure the pipes. This ensures that the heat-carrying pipes are fully enclosed by levelling compound. The levelling compound acts as a heat-conducting layer and ensures heat transfer directly to the floor covering. For these reasons, we also recommend using a levelling compound specifically designed for underfloor heating systems to embed the pipes in our OSB and dry screed systems.
Tight installation spacing
Due to the flexibility of the thin PE-RT pipes, which allow for small bending radii, they can be laid at tight intervals of 10 cm or less. As a result, the temperature difference at the floor surface between two pipes is so small that no metal plates are required for the cross-distribution of heat
Potential air pockets
Heat-conducting sheets can be problematic in very thin floor constructions. If the pipe does not fit perfectly within the sheet, insulating air pockets can develop, which have a negative impact on heating performance. In thin-layer systems, the direct bond between the pipe and the grouting compound is crucial for stability and heat conduction.
Acoustic risks
If heat-conducting plates are not absolutely firmly bonded to the pipe, they can expand when heated and cause noise (cracking).
If you have any project-related questions regarding the use of heat conductive plates, please feel free to contact our technical support team.
We are often asked how much it costs to retrofit underfloor heating per square metre. Before answering this question, we first enquire about the initial situation. How many rooms are to be retrofitted? How large are the heating surfaces? What is the condition of the floor? When was the house built? Is there thermal insulation? Is there a heating load calculation? Can the installation be carried out by the customer?
With the information on the initial conditions, we can suggest a suitable underfloor heating system and thus specify the costs for the heating technology.
However, the costs for retrofitting underfloor heating also include the costs of installation, the expenses for construction chemicals and, if necessary, for the disposal of the old floor. Our tips on cost calculation explain exactly which cost items need to be taken into account here.
We provide answers to the most important questions about insulating a low profile heating system.
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