Installation of solid wooden floors onto concrete/screeded floors

This information is to be used as a guide only and should there be any doubt please contact technical@rewmar.co.uk where you can obtain more detailed information.

Prior to installation your flooring should be stored in a clean and perfectly dry environment and there should be no direct contact with the ground. It is recommended that the floor is laid onto bearers spaced evenly to avoid contact with the ground. The flooring should NOT be exposed to the weather or stored outside and should not be stored in an upright position i.e leaning against a wall. Always follow the instructions provided by the flooring manufacturer with regard to acclimatisation and fitting of the wood flooring.

Before the flooring is fitted, the moisture content of the wood flooring should be checked to ensure its suitability for the environment into which it is going to be laid. The environment it is going to be laid in should be at a temperature and humidity level that is going to persist following the installation .(i.e the normal living or operating conditions).

The key to success with solid wood flooring installations are the correct site conditions both before, during and after the installation. The moisture content of the floor slab is vital to the installation process and the moisture content of the slab is recommended to be no more than 35% RH or 2% – 2.5% moisture content by volume. In practice it is very unusual for a concrete base to achieve a moisture content as low as this level and therefore the use of liquid epoxy damp proof membranes are generally advised to prevent the moisture causing problems with the wood flooring.

Moisture in the sub-floor is the biggest cause of failure for wooden flooring and with this in mind it is strongly recommended that some form of liquid DPM (Concrete Sealer) is used. Where the moisture content is higher than the 35% we suggest the floor is treated with a product like Rewmar MB a two part two coat operation. Following the curing of the concrete sealer or the epoxy DPM the application of Rewmar MS Polymer Flexible Adhesive will provide a successful solution to the problems associated with solid wood floor installation. When using our flexible wood flooring adhesive we recommend ensuring that there is enough expansion allowance left within the body of the floor to allow expansion. Although expansion will be allowed for at all abutments it must be remembered that the adhesive will only allow a certain amount of movement and will not for example allow for a 15mm movement at the edge of the floor. This cumulative movement must be allowed for within the actual body of the floor.

The products chosen to provide a solution are the latest development in flooring adhesive technology and unlike some of the more expensive systems these are free of Isocyanates and VOC’s and are far more healthy to use. Rewmar have now also introduced more environmentally friendly packaging so the whole system is easy and clean to use.

The above products are all compatible and therefore reduce the risks inherent in using different manufacturers products for the different stages of the process. In addition to the Rewmar products it is also possible to use any leveling compound whether it is latex based or water based as the Rewmar MS wood flooring adhesive is compatible with all of the proprietary brands so you can choose which one suits your needs.

When fixing solid wood flooring it is important to use a suitable adhesive that has a high bond strength and is permanently flexible, as the wood will need to move naturally. Some adhesives are too brittle to work effectively and whilst they may appear to be a cost saving, it is likely that in the long run the costs of re-fixing the floor will outweigh any savings made by using the incorrect adhesives. If you want an easy to use , clean and safe wood floor adhesive then you should choose an MS based product.

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