GRÜNDORF Holzwerkstoffe GmbH & Co. / www.gruendorf.de

Installation on cement/stone floors

When installing the planks on cement or stone floors, watch for uneven areas and level these out with a mineral levelling compound before installation. Ask your dealer for this.
A vapour barrier of 0.2 mm thick PE is essential as is footfall sound insulation, e.g. PE foam.

Installation on floor boards

Before installation you should level out uneven areas or lay
out the room with installation chipboards. Loose planks must
be fastened. Install your GRÜNDORF floor at right angles to the running direction of the planks. The footfall sound insulation must be put on the wood planks before installation. Do not use on a PE film.

Installation on wood-based panels

Before installation on chipboard or fibreboards you must level out all uneven areas. Always lay footfall sound insulation between the installation plates and the planks. Do not use a PE film.

Installation on PVC or linoleum floors

The PVC or linoleum floors must be completely glued and warm-water underfloor heating system cannot be used. Always install footfall sound insulation.

Installation on warm-water underfloor heating systems

Before installation, all mineral underlying floors must be heated to allow moisture that can damage the wood floor to escape.
The temperature of the warm-water underfloor heating system should be increased in 5°C steps every day until the maximum heating capacity is reached. Finally, the heating system must heat continuously at full capacity for at least 72 hours.

Measure the residual moisture in the floor and allow for the
following residual moisture contents:
• Cement floor <1.5 % cement moisture (CM)
• Anhydrite floor <0.2 % cement moisture (CM)
If the residual moisture content falls below these values, the heating system must be switched off again for 1-2 days before installation. During installation, the surface temperature of the cement floor must be at least 15°C but not more than 20°C. After installation – to which also our general guidelines for floating installation apply – the surface temperature of the floor must not exceed 25°C at most.

Other systems than the warm-water underfloor heating system are not suitable for GRÜNDORF floors. During heating periods – especially in winter – the relative humidity decreases. As a result, a natural product like wood dries out severely, which in turn

promotes the formation of gaps. With a humidifier you can
counteract the shrinking of the wood and this also has benefits for your health. An ideal room climate is given
at a relative humidity of 50–60%.

Solid wood planks are generally not suited for installation on warm-water underfloor heating systems.