This method is the most cost-effective way of installing the floor. Sub-floor requirements are less demanding. However, the sub-floor must be dry, clean, flat and solid. We recommend that a 0,2 mm PE-film with 200 mm overlap is placed on the sub-floor as moisture protection. An intermediate layer can also be installed on any film to reduce footstep noise. The intermediate layer, e.g. Kährs foam or lump paper, should be installed edge to edge. When installing a Kährs wood floor on an organic subfloor you must make sure that the floor covering including subfloor construction never contains more than one layer of moisture barrier. An alternative is to use Kährs Tuplex, which combines both moisture protection and sound installation. In this case no other intermediate layer should be used.
The humidity of the room must not exceed 60% RH and both boards and the room shall be heated to at least 18° C.