To install any rigid floor covering, from timber to concrete, or stone, requires a level floor. For timber the accepted British Standard requires a maximum of 3mm vertical deviation over a 2 linear meter distance. Although minor deviations from this can often be overcome with adhesive, any significant deviation will require the floor to be levelled. Although performed by countless companies and tradesmen the world over, this action is not always carried out correctly.
On many occasions we have encountered poorly applied leveling compounds which have been applied sporadically (in an attempt to 'spot fill' obvious dips in a sub-floor) and without the necessary primers. The result is a loose and unstable surface which is useless for future floor coverings and which must be removed.
Bonsai guarantees all of its work and so we carry out levelling work according to a strict procedure which is as follows:
- Prepare sub-floor by removing debris an creating a stable surface with a mechanical key.
- Apply 'Sika Primer MB' 2-part epoxy primer over the area to be levelled.
- Whilst wet, liberally broadcast Sika's dry, quartz sand over the entire area so that the primer is completely covered, then leave to dry overnight.
- Return to site and vacuum the entire surface, removing all loose sand to reveal a hardened surface with a sandpaper-like texture (the 'mechanical key').
- Apply Sika levelling compound over entire area until desired build up in floor level is reached and leave overnight. The volume of levelling will dictate the product to be used - typically Sika's 'Latex Ultra' quick-dryng compound.
- Return to assess sub-floor and if necessary, grind off any 'high-spots' or debris that may have settled into the surface.
- Leave surface to dry thoroughly until floor moistures readings dip below 75% RH; preferably nearer 60% RH.
- Once satisfactorily dry, the floor is ready to have a floor covering fitted.