How to Install Natural Stone Flooring over Underfloor Heating. Cutting Tiles, Sealing and Grouting (2)
If you consider installing natural stone flooring over underfloor heating you should know the benefits: slips-resistance (reduced risk of accidents due to slipping) and an increased lifetime (with proper maintenance) compared to other materials. You have the following steps: preparation, installation, applying adhesive, cutting tiles, sealing and grouting joints.
How to install natural stone flooring over underfloor heating?
Natural stone requires processing with high quality tools: use angle grinder with diamond blade for cutting or wet saw. For more complicated profiles use a cardboard pattern if you want to obtain accurate results.
When adhesive is dried, but before grouting, apply the initial coat of sealer. You have to select sealer based on finish and the type of stone you are working with. The initial coat prevents draining of dye from grout into the tiles; we recommend testing the sealer first on a less visible area, to make sure it does not stain. Extra coats of sealer can be applied after grouting.
This step comes after adhesive has dried. Tiles should be grouted with a matching color adhesive such as Weber.Color Perfect – Flexible wall & floor grout. Mix the adhesive with water, according to instructions and before applying adhesive, make sure the support is free from any dirt, dust or adhesive from the joints and leave them to dry.
Grout should be mixed by adding powder into water and we recommend to mix it by hand, for reducing the input of air. Grouting method is different, depending on the type of stone, for example non grouted or tumbled travertine and old limestone tiles should be grouted by keeping the tools at an angle of 45 ° from the tile surface, then inserting the grout mix diagonally, all over the tile. All this time, make sure the grout gets into the joints and the visible holes from the surface. Some tiles, such as polished marble, should be stung, with grout poured directly into the joints and not all over the surface, so that tile remains clean.
Grout should be removed from tile surface and allowed to be dried, during the grouting process. Clean dirt with a soft dry cloth. Difficult dirt is removed with a warm water solution and LTP Grout Stain Remover - Professional remover (cement, grout & limescale) in 24 hours after grouting.
Read also the first article on “How to Install Natural Stone Flooring over Underfloor Heating. Preparation, Installation and Applying Adhesive”.