Weber - Weber Set WF

Weber - Weber Set WF

For fixing ceramic tiles and natural stone:

- To walls and floors
- In interior and exterior situations
- For wet or dry service conditions
- In swimming pools, showers etc

Constraints

Addition of an admixture is required when:
Fixing low porosity tiles
Fixing to a low porosity substrate
Movement or vibration is expected
Fixing to walls above 3 m high

A cement-based wall and floor tile adhesive, available in grey or white, for interior and exterior use

About this product

weber.set WF is a cement based wall and floor tile adhesive, available in grey or white, for interior and exterior use. It is used to fix ceramic, mosaic, quarry, marble, terrazzo and terracotta tiles and brick slips to most building substrates.

Features and Benefits

- Manufactured under BSI Quality Assurance Scheme ISO 9001
- Available in grey and white
- Long working time for difficult layouts and small tiles
- Properties can be enhanced with admixture for difficult substrates
- Ideal for pools and heavily used showers
- Suitable for use in dry and wet conditions

Preparation

Ensure that all surfaces are clean, dry, sound and free from dust, grease or any contaminating barrier.

Make good any unsound areas and remove flaky or peeling layers before tiling.

Prime porous or dusty surfaces. weber PR370 is normally recommended for most walls in dry areas. weber AD250 is recommended for wood, wet areas and floors. Allow the primer to dry.

Check before use that the colour of the adhesive does not cause staining or discolouration of light coloured or translucent tiles.

Mixing

Gradually add approximately 3 parts of powder to 1 part of clean water (measured by volume), and mix to a smooth, workable, stiff paste. Normal usage requires 4.5 litres of water per 20 kg adhesive.

Use within 4 hours of mixing.

Do not attempt it extend the pot life by adding more water to the mix.

Use weber AD230 or weber AD250 in the mix if either the substrate or the tiles are impervious, or if limited movement is likely. This gives improved adhesion, resistance to flexing and improved impermeability to water.

Application

Do not use at temperatures below 5°C.
Apply the adhesive onto the substrate covering up to 1m2 at a time (or no more than can be tiled within 20 minutes). Use a suitable notched trowel to achieve a bed thickness of 3 to 6 mm. Large or studdedbacked tiles may need to have adhesive buttered onto the tile back as well.

Bed the tiles firmly into the adhesive with a slight sliding and/or twisting action, to ensure a good contact. It is good practice to lift an occasional tile after fixing, to verify that the required contact is being achieved. In wet areas, external areas and all floors, the final adhesive bed should be free from voids. Leave appropriate clearance joints for grouting and make any adjustments within 10 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 24 hours before grouting. Longer is required at lower temperatures or when tiling onto impervious or sealed surfaces. For swimming pools, leave at least 3 days before grouting, and then leave for a further 3 weeks before filling

Brick and blockwork
Allow at least 6 weeks before tiling.
Lightweight blocks need priming with weber AD250 and weber AD230 in the mix. Ensure that the wall face is sufficiently flat.

Cement/sand screed or render
Allow at least 3 weeks for screed and 2 weeks for render before tiling (for screeds this can be reduced to approximately 3 days by adding weber AD250 to the mix). Priming may be required if the surface is very dusty or porous.

Concrete
Allow at least 7 weeks before tiling onto new concrete. The surface should be clean and free from laitance. Surface scabbling is recommended. weber AD230 is needed in the mix on power floated screeds and set time will be extended.

Wallboards: fibre/cement, plywood, plasterboard, MDF
The board must be securely braced and fixed with screws at least every 300 mm.
Prime the reverse face and edges of plywood with weber AD250 before fixing. Include weber AD230 in the adhesive mix.

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 or polish. Use weber AD230 in the adhesive mix – set time will be slightly extended.
Plaster walls and anhydrite screeds Leave plaster for at least 4 weeks before tiling. Ensure anhydrite screeds are fully dry (moisture content <0.5%). It is important that the surface is sealed by repeatedly coating with primer until the surface stops absorbing. For walls in dry areas use weber PR370 otherwise use weber AD250 or weber PR360.

Underfloor heating/undertile warming
Use with weber AD230. The heating must be off, and should be turned on gradually at least 5 days after tiling. If the substrate is timber, it must be overboarded and weber AD250 should be used in the mix rather than weber AD230.

Wooden floors
Ensure the floor is rigid and strong enough to support the expected load with only minimal deflection and use weber AD230 in the mix. Tongued and grooved timber and chipboard must be overboarded with exterior grade plywood at least 15 mm thick.
Plywood floors should be at least 18mm thick and all joints must be supported. New boards should be primed on the reverse face and edges and 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 BS5385:

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 - Weber Set WF

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