The base should be:

  • Smooth (equal)
  • Durable
  • Dry
  • Clean

The main factor which will determine the future durability and functionality of the flooring is the quality of the base on which the flooring is laid. Most of the problems encountered during the laying and further use of the floor arise due to an improperly arranged base.


The check is carried out using a moisture meter, while the following maximum permissible values must be maintained:

  • For cement screeds – 2% humidity (from total volume of dry material), for screeds with heating – 1.8% humidity (from total volume of dry material)
  • For anhydride / anhydride leveling screeds (based on calcium sulfate) – 0.5% humidity (from total volume of dry material), for heated screeds – 0.3% humidity (from total volume of dry material)


The measurement of the surface flatness should be carried out using a measuring strip 200-250 cm long:

  • For click-lock floors 2mm differences are allowed on a length of 2000mm
  • For adhesive floors – the base must be perfectly even, no differences allowed

Durability and Hardness

The base beneath the cork layer should be a solid integral layer. Peeling, cracks, shells, and foreign inserts are not allowed.

Checking that the base is clean

The base under the floor must be cleaned from dirt and dust. On the basis there should be no residues or particles that reduce adhesion.

Types of Bases for Cork coatings

Screeds (cement-concrete, anhydride, etc. additionally leveled using leveling mixtures)

Usually, it is necessary to use two types of leveling mixtures:

  • Type One – for rough alignment, it creates the main thickness of the screed. For applying a thicker layer. With their help, differences from 1 to 7 cm can be levelled.
  • Type Two – for the finish. It is applied over the first layer with a thinner layer for final smoothing.

For creating a finishing smooth layer, we recommend that you use a leveling mass (liquid) or their analogues.

Base from sheet materials (HDF and Plywood)

Sheets of the material are laid in two layers with overlapping joints, the layers are sewn together with screws. The joints and the screw dents need to be puttied and primed.

The only thing to remember is that this leveling method does not always produce an ideal surface, as uneven waves can appear as a result of sagging or deformation of the sheets.

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