ADVICE & SOLUTIONS

FIXING TILES ON EXISTING CERAMIC COVERINGS

 
ADVICES PREPARATION APPLICATION FINISHING

What needs to be done to ensure the good adhesion of the substrate and thus ensure the good adhesion of the covering?

- INTERIOR FLOORS AND WALLS (FOR EXTERIOR APPLICATIONS: PLEASE CONSULT US)

- ALL PRIVATE AND PUBLIC AREAS

- SPECIALISED JOBS: RENOVATION OF FLOORS IN HYPER MARKETS, SHOPPING MALLS, SEE ADVICE SHEET N° 15.

 

Recommendations:

To avoid mechanical stresses in the case of fixing tiles of the same format as the existing tiling, make sure the joints are offset (by around 1/3 . Abrasive cleaning followed by sweeping is recommended as an alternative on ceramic tiles whenever work site conditions so allow.


SUITABLE EXISTING CERAMIC COVERINGS

- Pressed or extruded stoneware, enamelled or not, earthenware, enamelled lava stone, natural stone, marble and natural granite. Unsuitable: polyester tiles, cleavable slate.  

- Fissured coverings on floors with underfloor heating and terra cotta coverings: please consult us.

 

CLEANING - PREPARATION

 

Refer to the CPT specifications n° 3528 and 3529.

Natural stone and terrazzo coverings

Strip the surface with CERMINET (1 litre per 30 m2) or 10 % diluted hydrochloric acid with a brush or other suitable tool, rinse thoroughly and allow to dry.

If there is any surface treatment that may adversely affect the adhesion (water proofing, anti-graffiti treatment, crystallising, etc.), abrade the surface (with a rough diamond disc) to eliminate the gloss surface and improve the adhesion and then remove all traces of dust.

Enamelled or polished ceramic tiles

- Rub down as above until all the gloss surface has been eliminated;

Existing non enamelled tiles

- Thoroughly wash with caustic cleaning solution until all traces of oil, grease or gloss have disappeared followed by rinsing and drying;

Apply CERMIGRIP primer on enamelled or polished tiles, depending on the type of tiling adhesive (cf. table).  

 

SMOOTHING - FILLING - TREATMENT OF FISSURES

• On interior floors that need to be completely levelled (maximum P2 - P3, E2 areas): use RAGREROC RAPID or RAGRENOV S30 with CERMIGRIP primer.

• Filling of localised areas on cement substrates (thickness > 10 mm): use RAGRELISS + CERMILATEX or Mortier 350 + CERMILATIEX (cf. Technical Data Sheets n° 120,250,905).

• If tiles have become loose, the empty space (thickness < 10 mm) may be filled the day before fixing the tiles with the adhesive mortar.

• Bridging of fissures (less than or equal to 0.2 mm) without outcrops: apply CERMICRYL over a width of 2 tiles (in two 0.8 mm thick coats directly above them the day before fixing the tiles).  


CHOICE OF PRODUCTS DEPENDING ON THE CONSTRAINTS OF THE AREA OR THE EXISTING COVERING: See details in PDF

 

SUITABLE COVERINGS / ALL CERAMIC COVERINGS THAT COMPLY WITH THE CPT SPECIFICATION See the relevant adhesive Technical Data Sheet.

 

RAPID RENOVATION

• USE CERMIPLUS RAPID, CERMITEX RAPID, CERMIFLOOR HPR or CERMIFLOOR RAPID: jointing possible 2.5 h after fixing the tiles.;

• Use CERMIJOINT TX or CERMIJOINT TX + CERMILATEX for the jointing.


JOINTING

Depending on the job, do the jointing with the range:

- CERMIJOINT COLOR.

- COLORISSIMO JOINT POUDRE or EPOXY

- EPOSOL, EPOGLASS.

• The expansion joints must be removed and reformed starting from the original substrate, without any breaks in line with the joint (full tile).

• Allow for control joints in the flooring without any offset (between two new tiles).


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