SURFACE PREP
Setcrete also recommends that after completing installations on subfloors incorporating underfloor heating, the heating system should not be run for 10 days. Following this period, the floor temperature must be gradually raised at 5C per day to its optimal operating temperature.
TILE ADHESIVE AND GROUT
Once the levelling compound has been applied and cured, the floor is then ready for floor tiles to be installed, using a suitable tile adhesive. Setcrete recommends using a tile adhesive that offers a degree of flexibility to accommodate small movements and vibrations in the subfloor, along with a flexible grout.
This is especially important in bathroom installations over timber subfloor structures, which should also be overboarded with flooring grade plywood, firmly screw-fixed to the subfloor. A flexible levelling compound, such as Setcrete High Performance, should then be used to smooth and level the subfloor before installing floor tiles. A suitable waterproofing system should be incorporated in the build-up.
In most cases, a standard set tile adhesive can be used for the installation, but if time is a factor, rapid set adhesives will allow grouting to take place from three hours, rather than waiting until the following day.
When applied over non-absorbent subfloors, a primer will help to promote adhesion between the adhesive and the subfloor, by presenting a surface that the adhesive is able to readily key into.
TOP NOTCH TIP
Using a notched trowel of the correct notch size to apply flooring adhesive at the recommended coverage rate is essential to achieve optimum performance. Flooring adhesive manufacturers will recommend the correct notch size for a specific adhesive.
However, even if a trowel shows the notch size to be the correct one, if the trowel has been used for previous installations, it is important to check if it shows signs of being worn down as this will effectively reduce the notch size and, consequently, the amount of adhesive being applied.
https://setcrete.co.uk PRIME IMPORTANCE
In most circumstances it is essential to prime a subfloor before applying an adhesive. Without it, an absorbent subfloor will draw moisture out of the adhesive too quickly and compromise its performance.
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