Flooring Matters SW LTD recently carried out a project at a beautiful barn conversion in Cheriton Fitzpaine, Devon. The heating source the customer used was a wet underfloor heating system. For flooring, the customer chose a Quickstep Imperio engineered wood flooring which was to be laid throughout their large open plan living area and kitchen.
The heating system the customer used was a wet underfloor heating system. This was installed before an anhydrite self-leveling screed was pumped in to encapsulate the pipework. As the screed dries, a milky residue called laitance rises to the top during the curing process. Although the crusty surface dries hard the laitance is weak and has a chalky texture which is not suitable for bonding any floor covering to. In order to remove the surface laitance, mechanical preparation was required. For this, we used our diamond grinding machine which has a dust extraction unit attached so we were able to completely remove the surface laitance without causing too much dust.
To ensure a problem-free installation of wooden floor over underfloor heating, there are a number of rules to follow:
- The engineered wood flooring needs a minimum of 24 hours to acclimatise to its surroundings before it can be opened up.
- The underfloor heating system needs to be up and running and commissioned before any flooring can be laid. It’s also imperative that it switched off 48 hours before installation and then only turned up incrementally over the coming day’s post-install.
- An expansion gap is also needed around the entire perimeter to allow the wood to naturally expand and contract as temperatures change.
- Good adhesion to the substrate is required. We used a Mapei Turbo polyurethane primer then a Mapei Ultrabond 2K, a two-component epoxy PU adhesive, was used to fully bond the new flooring.