ADVICE & SOLUTIONS

FIXING TILES ON FLOORS WITH CONCEALED HEATING (ELECTRICALLY HEATED FLOORING)

 
ADVICES PREPARATION APPLICATION FINISHING

How to deal with the high thermal constraints of floors with underfloor heating?

ELECTRIC RADIANT HEATED FLOORING

Type of heating: heating cable or film  

A) Installed under a screed or a floating slab complying with the CPT specification n° 3606. 

B) Impregnated in a suitable mortar subject to an AT technical authorisation.

 

 

Recommendations :

• If there is microfissuring of the concrete substrate: use CERMIFACE bond breaking system.

• Finishing of joints: it is recommended to use CERMIJOINT SOUPLE or CERMIJOINT TX admixed with CERMILATEX.


A) Under a screed or floating slab with cable or film heating systems

SUITABLE SUBSTRATES: Screeds and covering slabs complying with the CPT specification n° 3606.

CONTROLS BEFORE FIXING THE TILES:

• Drying of the substrate: minimum 3 weeks.

• Increase the temperature progressively.

• Planeness tolerance: 7 mm under a 2 m ruler for normal consistency adhesive mortars, 5 mm under a 2 m ruler for fluid consistency adhesive mortars.

• Levelling mortars: If it is necessary to apply a levelling mortar:

-use RAGRENOV S30 for thicknesses from 3 to 30 mm under all types of covering.

- Use RAGREROC RAPID for thicknesses from 3 to 10 mm under ceramic coverings or parquet flooring.

Switch off the heating at least 2 days before fixing the tiles or applying the levelling mortar.  

B ) Impregnated in a suitable mortar, as per the AT technical authorisation

APPLICATION AREAS: Refer to the manufacturer's AT technical authorisation.

SUITABLE SUBSTRATES

• Screeds, concrete slabs, etc.

• Existing tiling.

• Existing bituminous*, neoprene or vinylic adhesives.

• Existing roughened paints* on concrete and cement* substrates with CERMIGRIP primer.

SUBSTRATE PREPARATION Refer to the Technical Data Sheet of the product used.


A) Under a screed or floating slab, heating cable or film

FIXING THE TILES

• Formats up to 10 000 cm2 with CERMIFACE combined with adhesive mortars classifed C2S1 of the DESVRES TOP PERFORMANCE* range.

• Use a U9, E10 or E15 notched trowel, depending on the format (see Technical Data Sheet).

• Allow for inter-tile joints of at least 4 mm or 6 mm, depending on the format.• Allow for the substrate joints.

• Allow for a peripheral joint of at least 5 mm.

• Use CERMIJOINT SOUPLE for jointing the tiles at least 24 h after fixing the tiles.

SWITCHING ON THE HEATING

• 2 days at least after doing the jointing. 

B ) Impregnated in the suitable mortar, as per the AT technical authorisation

COATING OF THE HEATING FILM: use CERMIDUR, CERMIFLEX ALG, or RAGRENOV S30. Please consult us.

FIXING THE TILES, FINISHING AND SWITCHING THE HEATING BACK ON: Refer to paragraph A)


• Use CERMIJOINT SOUPLE for the tile joints at least 24 h after fixing the tiles.

 

SWITCHING THE HEATING BACK ON

 

• Wait at least 2 days after jointing.


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