13-Tiling On Walls In Wet Areas


Do not tile onto new render or concrete. Leave plaster or concrete for at least 6 weeks before tiling. Due to high water absorption ratio of wall tiles and different stresses forming between adhesive and plaster, capillary cracks will appear on the plaster when it does not complete its final set time.

The substrate must be clean in order to ensure the adhesive bonds properly. Surfaces should be clean and free from dust, dirt, grease or any other contaminating barrier. Subsequently hardened or polished surfaces and laitance (concrete and etc.) must be removed by scabbling. Ensure that substrate is mature, sound, stable and smooth, and not too dry or wet. It is recommended to clean up the surface with pressurized water.

The deepest point of the application surface in 2 m long gauge should not exceed 5 mm. For larger deviations, the surface should be smoothened with surface smoothening plasters.


Tiles of any format and size as recommended by the manufacturers.




High porosity substrates should be primed with CERMIFILM before fixing. Priming will balance the water absorptivity of the surface and enhance bonding adherence. Wait for at least 3 hours for the primer to dry and then continue to next application.

For fixing high porosity wall tiles (≤33x33 cm) select CERMICOL SUPER; for fixing low porosity porcelain tiles, glass tiles and mosaics (<30x60 cm) select CERMIPLUS.

Gradually add clean water to powder (in quantities as stated in technical legends of products), and mix to a smooth and homogenous paste. It is recommended to use a low cycled electrical drill-mixer for mixing.

The paste should be in a consistence such that it does not flow when handled with a trowel.

The paste should rest for 5 minutes prior to application and should be applied after remixing.

Apply the adhesive on the substrate (for tile sizes >33x33 cm, adhesive should be buttered onto the tile back as well) with a suitable notched trowel to achieve the required bed thickness. Glass tiles, natural stones and marbles should be fixed with double buttering method.

The tiles must be fixed within the open time of adhesive and pressed on with a twisting and sliding action to achieve a good contact. The tile should be gently hammered with a rubber hammer in order to provide the stability of bonding and the adhesive to spread and fully cover the tile back. Lift an occasional tile after fixing to verify that the required contact is being achieved.

Excess adhesive must be cleaned off from the tiles and joints with a damp cloth or sponge before it hardens.

In fixing transparent and light colored tiles and natural stones, a sample application should be carried to observe the possibility of the formation of stain and shades. In case, white coloured adhesive should be used.

To improve the technical performance of the adhesive, it is recommended to add CERMILATEX into the mixing water in the ratio 1:3 (As for the mixing water; instead of 3 scales of water, 2 scales of water and 1 scale of CERMILATEX). With additive added, CERMIPLUS can fix tiles in sizes up to 60x60 cm.

Grouting should start after the adhesive has set and dried. Grouting material’s colour may taint due to adhesive’s cement content and colour.

For grouting application select one of CERMIJOINT 1-6 EXTRA, CERMIJOINT 3-10 FLEX, CERMIJOINT 0-3 FLEX according to technical requirements.

While applying cement based grouts, carefully follow the rules and instructions on product packaging and technical legends of the products. Do not add more water into the mixture or re-wet once the mixture is prepared. This will cause the set grout to be weak. It may also cause discrete holes and grains on grout surface, and surface discolouration and variation which will be more noticable with darker grouting colours.

For a easier application and to ensure full final product performance, the grout should be applied at an ambient temperature range of +10 °C - +25 °C.

Grouted surfaces must be protected for at least 24 hours from direct sunlight, frost and rain.

If any stains and residues remain after grouting, wait for 10 days and treat the tile with CERMINET tile cleaning material to loosen and remove these residues.