High porosity substrates should be primed with CERMIFILM before fixing. It is applicable to tile on gypsum based substrates in internal areas whether primed with CERMIFILM. 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.
If plastering for surface smoothening or repairing surface damages is needed, select CERMIMORTAR 2-10 surface smoothening and repair mortar. CERMIMORTAR 2-10 should be applied with a maximum thickness of 7 mm. Prepare and apply the plaster following the instructions on product packaging and technical data sheets. In case of complete plastering of the surface, wait for at least 6 weeks for the plaster to complete its final setting.
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 2-10 HRC, CERMIJOINT 3-10 FLEX, CERMIJOINT 0-3 FLEX according to technical requirements. CERMIJOINT 2-10 HRC have improved water repellency and chemical resistance, thus they are ideal for grouting on kitchens where water, food and chemical surface cleaning material residuals may have corrosive effect on surfaces.
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.
Expansion joints should be incorporated to allow for slight movements due to changes in temperature, humidity and thermal and mechanical loads formed on the surface and substrate. Expansion joints should be provided considering heat transmitting systems and insulation applications, floors exposed to heavy traffic and pedestrian loads, wideness of the area, where tiling meets other materials, along all internal corners, existing movement joints or changes in background material. As described above expansion joints absorbs the stresses formed between different movement capacities of overlapping materials. Thus, it prevents the deformations that may arise in the surface and covering. Expansion joints should be insulated by using proper profiles or mastics. Cementitous grouting materials are not appropriate for expansion joints.
On walls; in internal corners, overlapping wall coverings and on areas > 3 m x 3 m expansion joints should be applied. Expansion joints should have minimum width of 6-10 mm along internal corners (wall and floor intersections) this rule should be followed, and skirting should be fixed upon to the completion of tiling.
No coatings or coverings should be applied on the existing dilatation zones and structural expansion joints in buildings. These zones should be insulated by using proper profiles or mastics.
CERMISIL NS sealant can be used to fill expansion joints.