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Tile installation OVER overlay heating systems

The stresses on a tiling installation caused by underfloor heating should not be underestimated and it is important to ensure that the correct installation methods are adhered to, says Tilemaster, especially when under time pressure.

When time is of the essence, it is essential to use a system that will allow rapid completion without cutting corners, safe in the knowledge that the installation will not fail.


Once the carrier board and pipework are installed, the whole should be primed, for example with Prime+ Grip and then LevelFlex+ DEPTH used to smooth and level before tiling. LevelFlex+ DEPTH is a flexible, fibre reinforced, rapid setting smoothing and levelling compound designed to cope with the expansion and shrinkage caused by the underfloor heating. It can be used in depths of 2mm – 85mm and can be walked on after 2.5 hours.


Rapid Setaflex adhesive should then be applied, and an Anti-Fracture Mat fitted to compensate for the stresses caused by the heating system. Next, a second layer of Rapid Setaflex is used to fix the tiles over the mat making sure the tiles are laid on a solid bed of adhesive with no voids. Rapid Setaflex is reportedly ready for grouting after 3 hours with a 30 minute pot life and has S1 flexibility making it suitable for use with UFH systems.


After fixing, tiles can be grouted with Tilemaster Grout 3000, a flexible, fast setting wall and floor grout which can be used for joints between 1mm and 20mm, available in a range of 18 colours allowing you to colour match to the tile, or to use a contrasting colour as desired. Movement joints should then be filled with Silicone 3000+ in a matching colour.


Once tiling has been completed, wait at least one week before turning the heating system back on and do so gradually to commission the tile installation. Once complete, the heating can be used as normal.
info@tilemasteradhesives.co.uk
www.tilemasteradhesives.co.uk
01772 456831

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