Parquet | Underfloor heating

Lamett only gives a warranty on floors installed on water based underfloor heating systems - electric underfloor heating systems and reversible underfloor heating systems (cooling / heating) are explicitly excluded from any warranty.

There are a number of rules for the installation of parquet on underfloor heating. The installation of parquet on underfloor heating adds additional thermal resistance: the thermal resistance above the floor heating may not exceed 0.15 m²K/W.

Underfloor heating

  1. The total thermal resistance above the floor base is calculated by adding together the thermal resistance of the parquet as well as that of the glue.  The floor base must lie at least 50 mm above the heating tubes. The thickness of the floor base above the tubes is called the screed. Reducing the thermal resistance by reducing the thickness of the screed is not recommended. A higher water temperature in the heating tubes is also undesirable, because increased heating of the parquet can cause cracking (due to shrinkage of the wood).
  2. The moisture content of the screed: max. 2% for a cement bonded screed, 0.5% for an anhydrite screed
  3. Use glue that is suitable for underfloor heating (e.g., Lamett Power Glue). Follow the manufacturer's installation instructions regarding recommended room temperatures etc.

Advice: Glued installation is recommended for optimal heat conduction. With a floating installation, there are layers of air present which increase the resistance to the thermal conduction.

Before installing the parquet:

Start up the underfloor heating gradually. Allow the water temperature to increase 5°C per day. This must be set on the boiler. Once the water temperature has reached 50°C, this temperature must be maintained for a minimum of 5 days.

During installation:

The underfloor heating must be switched off 48 hours before installation begins. Please note that the room temperature requirement must be respected; see installation instructions for glue/parquet. This temperature requirement is usually around 15°C. If necessary, use a free-standing heating element.

After installation:

The water temperature can be raised to the desired room temperature by 5°C per day (setting on the boiler) but only starting on the 8th day after installation.

Points of special interest:

  • Maximum water temperature is 50°C.
  • Maximum surface temperature of the wood 26°C:
    This can be measured with a regular room thermometer or with a wood meter. Of course, the thermometer must be lying on the ground when the measurement is made.
  • Warming and cooling of the floor must occur gradually. Abrupt differences in temperature can cause permanent damage to the parquet.

These guidelines are merely meant as recommendations. The nationally applicable standards must be complied with at all times.

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