Rules for using TrueWood in combination with underfloor heating
Laying a TrueWood floor in combination with underfloor heating can be achieved and will ensure your home is as comfortable as possible.
When laying a wooden floor in combination with underfloor heating you must, however, follow a number of specific rules.
The TrueWood guarantee applies to wooden floors that are laid in combination with a underfloor heating system as long as the instructions below are observed. The TrueWood guarantee will, however, no longer apply should the instruction below not be observed.
Wood is a living natural material, hence it will “move” (shrink and swell) under changing climatic conditions. Taking this in consideration, it is vital that the heating process of the underfloor heating systems is carried out properly in order to prevent stresses being created within the wood flooring and to ensure that the moisture content in the wood is at the appropriate level during the entire year to avoid problems with swelling and shrinkage.
Special conditions and rules for laying TrueWood in combination with underfloor heating
- The thickness of the concrete floor creed / anhydrite floor that is applied over the heating pipes must at least be 30mm.
The prescribed heating protocol must be followed regardless the season to achieve the allowed moisture percentage of the screed. The screed must be at least 28 days old before the underfloor heating is started up. Set the water temperature to 20 degrees Celsius on the first heating day.
- The water temperature must subsequently by increased by maximum 5oC every 24 hours. You are allowed to do this up to a maximum of 45oC. This maximum temperature must be maintained for a few days. It is important to know what the thickness is of the screed to be able to calculate the exact number of days. If the screed is 5cm thick, this means that you must maintain the maximum temperature for 5 days. The number of days is, therefore, the same as the number of centimetres that your floor is thick. The reduction of the water temperature must be done in the reverse order. The total procedure will take up approximately 14 days. During this procedure, ensure that there is good ventilation in all the rooms so that any moisture that is released can be correctly discharged.
- The moisture percentage of the concrete screed may not be higher than 1.5% before the wooden floor is laid. This moisture percentage may not be higher than 0.3% with regard to an anhydrite floor.
The wooden floorboards must be allowed to acclimatise for at least 48 hours in their unopened packaging in the room where they are to be laid.
- We recommend using a perforated underlay with regard to laying a floating floor and, if gluing, use a suitable water-free adhesive. For more information consult your adhesive supplier.
- When the wooden floor has been laid, the floor heating can be put into operation in accordance with the prescribed heating protocol.
- The first day the water temperature should be set to 20o Celsius. The water temperature can then be increased by maximum 5oC every 24 hours. The flow temperature of the water may not be higher than 45oC and the floor temperature may amount to no more than 25oC. Note: The same applies under furniture, carpets and heating pipes.
- The procedure must be followed in the reverse order when the system is switched off. Recommendation: do not set the thermostat to a low level in the evening and again to a high level in the morning to ensure temperature fluctuations are avoided as much as possible.
- The best condition for a wooden floor is a relative air humidity of between 40% and 60%. Shrinkage may occur when the relative air humidity is lower making the use of a humidifier a requirement.
Beech, Ash, Maple and Jatoba are wood types that easily warp and, therefore, are not recommended for use in combination with underfloor heating. The TrueWood guarantee will not apply when these wood types are laid in combination with underfloor heating.
A wooden floor may not be laid on floor heating systems that have been installed before 1990. These systems, generally, produce temperatures that are too high.
Ensure that you know that your floor heating system is suitable for use in combination with wooden floors.