1. Inspection and cleaning
   • Carefully examine the existing surface for any damage or loose parts.
   • Remove the old floor covering and skirting boards if necessary.
   • Thoroughly clean the surface, removing all traces of grease, residue and glue. Consider using the glue pads, accessories of your Multidisque 4D or the new ranges of dedicated abrasives.
2. Humidity control
   • Check the humidity level of the surface with a moisture meter.
   • For a cement screed: < 2.5% CM (75% RH).
   • For an anhydrite screed: < 0.5% CM (50% RH).
   • For a wooden surface: < 10% humidity.
3. Hardness control
   • Check the hardness of the substrate with a moisture meter. The Mohs® hardness test kit offered by Repex is an essential tool for craftsmen specialising in polished concrete, decorative and hard floors. This kit allows for a quick and efficient evaluation of the hardness of the concrete surface on a scale of 1 to 10, where 10 represents the hardness of diamond. By determining the scratch resistance of the surface, professionals can make informed decisions about the choice of diamonds to use and the sanding method to adopt. This precise evaluation not only optimises the work process, but also potentially saves hundreds of diamonds and many hours of work, thus guaranteeing a high-quality end result for the treated floors.
4. Checking flatness
   • Make sure that the surface has no irregularities greater than 2 mm per metre and 1 mm per 20 cm.
   • Use a ruler and a parquet knife to check the flatness.
5. Levelling
   • If necessary, apply a levelling compound to correct any irregularities.
   • Use a spatula to smooth the surface.
6. Application of a bonding primer
   • Apply a primer suitable for the type of substrate to improve adhesion.
   • For porous substrates, use a specific primer.
7. Laying of an underlay
   • For a floating installation, install a polythene film as a moisture barrier.
   • For glued installation on a surface with a humidity level of between 3 and 10%, use an insulating underlay.
8. Acclimatisation of the parquet
   • Leave the parquet to acclimatise in the room for at least 48 hours before installation.
9. Specific preparation according to the surface
   • On old parquet of no interest: lightly sand the surface with coarse-grained paper.
   • On tiling: make sure the tiles are properly fixed and level if necessary.

By following these steps, you will create the optimal conditions for successful parquet installation, thus guaranteeing its longevity and appearance for your customers.