Multilayer hardwood flooring and floor heating combine the natural beauty of wood with even thermal comfort and high energy efficiency.
There is a widespread misconception that natural hardwood flooring is not suitable for rooms with underfloor heating. With modern multilayer hardwood flooring, this has long since ceased to be the case.
The hardwood floors that Phivex Eco offers for use with underfloor heating are designed as stable multilayer constructions in which the natural top layer is combined with stabilizing lower layers. It is precisely this construction that significantly limits the natural shrinkage and expansion of the wood due to changes in temperature and humidity.
Leading European manufacturers such as Bauwerk, Timberwise, and Weitzer Parkett recommend installing a large portion of their multilayer hardwood flooring over properly designed and installed underfloor heating systems.
Underfloor heating provides comfort in a different way than traditional radiators. Instead of heat being concentrated at specific points in the room, the entire floor surface becomes a large, low-temperature heating area.
When properly designed, the result is a comfortable temperature in the areas we actually use, without the need for individual radiators to take up space along the walls.
For the interior, this also has a purely architectural advantage—the absence of radiators allows for a more flexible arrangement of furniture and a cleaner visual line in the rooms.
In engineered hardwood flooring, the individual layers are designed to limit these movements. The European standard EN 13489 is the standard for engineered hardwood flooring elements and specifies their characteristics, requirements, and test methods. The current edition is EN 13489:2023.
This multilayer construction is one of the main reasons engineered hardwood flooring has greater dimensional stability than solid wood flooring during cyclic changes in temperature and humidity.
This is particularly important with underfloor heating, because the flooring undergoes constant but moderate cycles of heating and cooling.
With this method, there is no additional air layer between the subfloor and the parquet, and heat is transferred more directly to the flooring.
In addition to better heat transfer, full adhesion:
In a standard hydronic system, heat is transferred sequentially through:
the heating pipes → the heated screed → the adhesive layer → the multi-layer hardwood flooring → the room.
Therefore, the system’s efficiency does not depend solely on the parquet itself. The entire structure is important—insulation, heating system, screed, adhesive, and final flooring.
The lower the total thermal resistance of the layers above the heating system, the easier it is for heat to reach the room.
A clear temperature limit must be set for natural wood flooring.
For hardwood flooring installed over radiant floor heating, we adhere to the following basic operating rule:
The surface temperature of the hardwood flooring must not exceed 27°C.
It is important to distinguish this from the general European standard for floor heating.
The EN 1264 series regulates water-based surface heating and cooling systems integrated into floors, walls, and ceilings. The standard includes definitions, methods for calculating heat output, sizing, and installation rules.
Under EN 1264, the overall maximum floor surface temperature in a standard living area is 29°C. It is precisely this value that appears in the technical documentation from Bauwerk and Weitzer for systems compliant with EN 1264.
EN 1264 allows up to 29°C for the floor heating surface, but for hardwood flooring, it is recommended that the system be adjusted so that the wood flooring itself remains at a maximum of 27° C.
Before installing the hardwood flooring, the heated screed must undergo a preliminary heat test and a controlled heating cycle to verify the system’s proper operation and facilitate the removal of residual construction moisture. As a requirement, we recommend a 14-day heating cycle, performed and documented prior to installation, with heating and subsequent cooling to be gradual.
The European standard EN 1264-4 requires functional heating of heated screeds, but the specific duration and temperature regime depend on the type of screed and the manufacturer’s instructions; for example, with standard cement-based screed, functional heating usually begins no earlier than after the required curing period. Upon completion of the test, the residual moisture content of the screed must be measured, and the subfloor must be confirmed as ready for parquet installation.
When wood dries out too much, it naturally shrinks. This can lead to:
Timberwise recommends that, in addition to the 27°C limit, the floor temperature should not fluctuate by more than about 2°C over the course of a 24-hour period.
Underfloor heating works best as a slow and even system.
For natural wood, it is also better for the temperature to rise and fall gradually.
Suddenly turning on the heating at a high temperature after a prolonged period without heating can place a significantly greater strain on the wood than the system operating continuously at a moderate temperature.
Therefore, the approach should be:
low temperature + smooth adjustment + constant monitoring.
Underfloor heating does not negate the standard requirements for the subfloor.
Before installing hardwood flooring, the subfloor must be:
For heated screeds, the system must also have undergone the prescribed heating cycle in advance.
This allows residual construction moisture to be controlled before the wood subfloor is glued down.
Wood naturally releases moisture when relative humidity is low. This is precisely when more visible seasonal gaps may appear.
Therefore, proper care of your hardwood floors involves not only temperature control but also maintaining a healthy indoor climate.
Thick carpets and furniture that practically cover the floor surface limit heat transfer into the room.
This can lead to localized heat buildup underneath them, causing the temperature of the hardwood floor to become higher than that of the exposed part of the floor.
Weitzer specifically warns about this effect when using rugs on heated hardwood floors.
For this reason, with underfloor heating, it is good practice to avoid covering a large portion of the hardwood floor with thick, heat-insulating materials.
The hardwood floors from Bauwerk, Timberwise, and Weitzer Parkett, which are designed for installation over underfloor heating, are based on the same fundamental principle: a stable, multi-layer wood construction, controlled thermal resistance, and a properly installed low-temperature heating system.
Bauwerk specifies the suitability of its hardwood floors for underfloor heating in accordance with EN 1264, Timberwise requires a maximum wood surface temperature of 27°C, and Weitzer Parkett also specifies a maximum parquet surface temperature of 27°C and recommends full-surface gluing for optimal heat transfer.
Rather than viewing these manufacturers as three different systems, the correct approach is to follow the general, more stringent requirements for natural wood flooring:
natural wood flooring and consistent thermal comfort.
It is important to view the floor as a system rather than as individual products.
Underfloor heating must be properly designed and installed in accordance with EN 1264, the screed must meet the applicable requirements and be ready for installation, and the engineered wood flooring must be suitable for such an application and properly installed. The standards EN 13489 and EN 14342 specify, respectively, the requirements for engineered wood flooring elements and the characteristics of wood flooring.
When these principles are followed—maintaining an appropriate indoor climate and limiting the temperature of the parquet surface to a maximum of 27°C—natural multi-layer parquet and underfloor heating are fully compatible and can provide a comfortable, efficient, and long-lasting flooring system.
Natural luxury hardwood floors, three-layer and figured hardwood floors, solid wood facades and decking
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