Stephen Thornton, technical manager – tiling and flooring, at Saint-Gobain Weber, explains the importance of making the right flooring preparation choices when it comes to heat pump systems.
THE long-awaited Future Homes Standard will accelerate the shift away from fossil fuel heating towards heat pumps paired with low-temperature underfloor heating.
For tilers, this has important implications.Tiling remains one of the best floor finishes for heat pump-led homes.
Compared with carpet, ceramic and porcelain tiles offer far lower resistance to heat transfer. Compared with LVT, they provide greater thermal mass and are less sensitive to localised heat build-up, which helps support steady, energy-efficient comfort.
In these systems, floor build-up plays a direct role in how efficiently heat moves into the living space. If you get the preparation wrong, the system can be compromised before the first tile is fixed.
Starting with the substrate
Modern pumped screeds are becoming increasingly common on residential projects because they can be installed quickly and can help achieve the surface regularity needed for contemporary tile formats.
But speed of placement doesn’t remove the need for correct preparation. It makes product choice and sequencing more important.
Where a calcium sulphate screed is used, for example, installers need to manage the known risks properly. Surface laitance must be removed, moisture levels must be checked rather than guessed, and the screed must be primed with a compatible product before tiling begins.
At Weber, that’s exactly why we stress a system-led approach, using the right preparation products before the tile adhesive is even opened.
SR1 still matters
Ensuring a flat surface is crucial. If the screed does not achieve SR1, the tiler is often left trying to correct the floor with adhesive, which isn’t what tile adhesive is designed to do.
A fibre-reinforced smoothing compound such as weberfloor flex can help create the surface regularity needed for efficient installation over underfloor heating.
Moisture mindfulness
Moisture control isn’t a universal requirement before tiling. But where floors are heated, unmanaged residual moisture remains a common cause of avoidable adhesion and performance issues.
This is where combining the correct primer with a proven adhesive such as weberset rapid SPF and grout – such as weberjoint premium, which exceeds the requirements of BS EN 13888 – CG2 WA – gives installers a more reliable route to success.
As the Future Homes Standard drives wider uptake of heat pumps, preparation choices will matter more than ever. Screed type, moisture control, priming and surface regularity all shape the final result. For installers, the best outcome comes from treating the floor as a complete system.
When that system is properly specified, tiled finishes can help low-temperature heating perform exactly as it should.
Stephen Thornton
Technical manager – tiling and flooring, Saint-Gobain Weber | www.uk.weber
