Weber - Fermafluide Chrono

Weber - Fermafluide Chrono

For fixing ceramic or porcelain tiles:

- Floors
- Interior and exterior situations
- Underfloor heating
- Overboarded wooden floors
- Low porosity tiles or substrates
- Power-floated screeds
- Tiling onto existing tiles

Constraints

Do not use:
   On substrates that are very deformable
   On substrates that are subjected to thermal shock
   In medical areas With floors containing an electrical radiant heating system
   On difficult substrates such as metal, polyester etc

A rapid-setting, polymer-modified, cementbased, pourable floor tile adhesive for interior and exterior use

About this product

Fermafluide chrono is a rapid-setting, polymer-modified, cement-based, pourable floor tile adhesive for interior and exterior use.

It is used to fix large tiles of all classes of porosity, without backbuttering.

Features and Benefits

- Gives improved adhesion for fully vitrified tiles
- Particularly suitable for large tiles
- Suitable for use in dry and wet conditions
- Ready for light foot traffic and grouting after 3 hours
- Areas can be back in service after 6 hours
- Easy to mix and apply

Preparation

Ensure that all surfaces are free from grease, oil or laitence. Vacuum away any loose dust or debris.
On very porous sand/cement screeds or concrete, dampen the surface and allow any standing water to be absorbed.
Localised holes up to 10 mm deep can be filled with fermafluide chrono during tile fixing.
Any significant holes should be filled at least 48 hours before tiling.
Prime anhydrite screeds or power-floated screeds with weber PR360 and allow to dry for a few hours before tiling.

Ensure that anhydrite screeds are fully dry before covering with fermafluide chrono. Prime timber or parquet adhesive residue with weber PR301 and allow to dry for 1 – 3 hours. The primer must still be tacky when fermafluide chrono is applied.

Mixing

Using a slow-speed mechanical mixer, gradually add 25 kg of powder to 5 – 5.5 litres of clean water and mix to a smooth, workable paste. Allow to stand for 3 minutes.
Use within 30 minutes of mixing.
Do not attempt to extend the pot life by adding more water to the mix.

Application

Use within a temperature range of +5°C to +35°C and do not apply to frozen, thawing or hot surfaces.

Pour the adhesive onto the substrate. Spread the adhesive with a suitable trowel to ensure an even coverage according to tile size, thickness and substrate. The adhesive bed must be thick enough to cope with any ridges on the tile back.

Press the tiles firmly into place to displace any air and ensure good contact. It is good practice to lift an occasional tile after fixing, to verify that the required contact is being achieved.

Leave appropriate clearance joints for grouting and make any adjustments within 15 minutes.

Carefully clean off any excess adhesive with a damp cloth or sponge from the tiles and joints before it sets.
Leave for at least 3 hours before grouting. Longer is required at lower temperatures.

Cement/sand screed
Allow at least 3 weeks for screed to dry before tiling. Priming with weber AD250 or weber PR370 may be required if the surface is very dusty or porous.

Concrete
Allow at least 7 weeks before tiling onto new concrete. Surface should be clean and free from laitance – scabbling is recommended. Set time will be extended on dense or power floated screeds.

Existing ceramic/vinyl tiles
Ensure that the substrate is strong enough to take the weight of extra tiling, that the existing tiles are firmly adhered and that the surface is free from any wax, polish or detergent. Set time will be slightly extended.

Anhydrite screeds
Ensure anhydrite screeds are fully dry (moisture content <0.5%). It is important that the surface is sealed by repeatedly coating with weber PR360 until the surface stops absorbing.

Underfloor heating/undertile warming
The heating must be off, and should be turned on gradually at least 5 days after tiling. Heating elements must be hidden in a screed.

Wooden floors
Ensure the floor is rigid and strong enough to support the expected load with only minimal deflection. Tongued and grooved timber and chipboard must be overboarded with exterior grade plywood at least 15mm thick. Plywood floors should be at least 18 mm thick and all joints must be supported. New boards should be primed on the reverse face and edges with weber AD250. All boards must be screwed down every 300 mm.

Allowance for movement

Flexible joints should be incorporated to allow for slight movements due to changes in temperature, humidity etc. as indicated by BS 5385:

a) where the tiling meets other materials (e.g. floor perimeters)
b) along all internal corners – vertically and horizontally
c) over existing movement joints or changes in background material
d) dividing large tiled areas into bays (every 3 – 4.5 m on walls, 8 – 10 m on floors.

Health and Safety

Contains cement.
For full information on Health and Safety, please see inside back cover.

Technical services

Weber’s Customer Services Department has a team of experienced advisors available to provide on-site advice both at the specification stage and during application. Detailed specifications can be provided for specific projects or more general works. Site visits and on-site demonstrations can be arranged on request.

Technical helpline

Tel: (01525) 722137
Fax: (01525) 718988

Storage and Shelf life

When stored unopened in a cool, dry place at temperatures above 5°C, shelf life is 12 months from date of manufacture.

Weber - Fermafluide Chrono

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