DIY Retrofit Low Profile Underfloor Heating
Thermal comfort of underfloor heating for existing and old buildings
Our low profile underfloor heating achieves a minimum installation height of 17 mm. The flat construction also allows retrofitting to existing floor surfaces.
Central component of our all-in-one DIY heating kits is a high quality, 10 mm thin PE-RT composite pipe. It is oxygen tight, temperature resistant and flexible to install. RTL technology ensures safe operation even with conventional heating systems with high flow temperatures.
The water-bearing underfloor heating system is connected between the flow and return of the heating system in the same way as a conventional radiator. Existing radiators are either replaced or, as with towel radiators in the bathroom, operated in conjunction with the radiant heating system.
Our DIY kit is designed for retrofitting heating surfaces of up to 10 m². For larger areas, multiple sets can be combined and connected to the heating system via RTL boxes. Low-tool installation, special plug-in connections and detailed installation instructions and videos make it extremely easy to lay the thin underfloor heating system.
Upgrade individual rooms such as the living room or bathroom with low profile underfloor heating. Bring the thermal comfort of FLEXIRO into your home.
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Technical data - Low profile wet underfloor heating kitHeating capacity for different surface materials and other technical information119 KB
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Installation Manual - How to Fit a Low Profile Underfloor Heating with Clip RailsComprehensive DIY installation guidelines with all required information to retrofit a water underfloor heating system using clip rails.734 KB
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Installation Manual - DIY Underfloor Heating Kit with Stud PlatesComprehensive installation guidelines with all required information for retrofitting a low profile wet underfloor heating using stud plates.978 KB
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The existing subfloor must always be level, clean, dry and load-bearing.
Once this requirement has been met, FLEXIRO underfloor heating can also be laid on OSB boards. However, according to the specifications of one of the leading manufacturers of construction adhesives, Bostik GmbH, the OSB boards must be connected to the subsurface. Floating boards are not suitable. The OSB boards must be primed before laying the FLEXIRO underfloor heating. In this case, the heating pipes should be covered with screed by at least 5 mm.
In many cases, low profile underfloor heating can be installed directly on top of the existing floor covering. Modernising an already insulated floor with this type of underfloor heating therefore usually requires no additional insulation. For this reason, the FLEXIRO Shop only sells special insulation boards for damp rooms. Any additional floor insulation required can be purchased from specialist builders' merchants. Once the insulation has been applied, a load-bearing surface must be created before the low profile underfloor heating can be laid.
This is possible, but floating wooden structures are still out of the question as they are very vulnerable to deformation. Installation is therefore only possible on connected wooden structures which must be decoupled. If you have any questions about laying underfloor heating on wooden floorboards in a specific case, please contact our technical support team.
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