Weber Saint-Gobain - Official website of the company

weber.set Ultra-flex

weber.set Ultra-flex
weber.set Ultra-flex

Product benefits

  • 6-hour set
  • Adhesive designed to absorb lateral movement
  • Interior and exterior application
  • Can be applied up to 20 mm thick
  • Suitable for wall and floor use
  • Suitable for use with under floor heating
  • Suitable for tiling over timber flooring and existing Ceramic and
  • Porcelain tiles
  • Consistent quality - ISO 9001 and 14001 accredited manufacturer

weber.set Ultra-flex is a highly deformable, high strength, rapid-set cement-based tile adhesive for wall and floor applications. Produced from carefully selected raw materials for consistency of product, it only requires the addition of water on site.

Product Features

Use

weber.set Ultra-flex is used for fixing Porcelain, dark Marble, Granite, Ceramic, Stone, Brick and Clay tiles.

  • Suitable for walls and floors
  • Suitable for interior and exterior use
  • Do not use this product on white or light coloured Marble or porous Porcelain tiles, as it might cause discolouration of the tiles. weber.set White is recommended for this purpose.
  • The 6 hour set makes it ideal for quick installations.

It is most suitable for levelling and repairing surfaces with depressions up to 8 mm before applying tiles.

weber.set Ultra-flex ensures a flexible bed on critical surfaces like:

  • Pre-cast concrete
  • Post tensioned floors
  • Heated screed
  • Tile on tile applications
  • Power-floated floors

Features and Benefits

  • 6-hour set
  • Adhesive designed to absorb lateral movement
  • Interior and exterior application
  • Can be applied up to 20 mm thick
  • Suitable for wall and floor use
  • Suitable for use with under floor heating
  • Suitable for tiling over timber flooring and existing Ceramic and Porcelain tiles
  • Consistent quality - ISO 9001 and 14001 accredited manufacturer

Technical Data

  • Initial setting time: approximately 3 hours
  • Final setting time: approximately 6 hours
  • Correction time: approximately 20 minutes
  • Open time: approximately 20 minutes
  • Pot life: approximately 1 hour 
  • Grouting time: approximately 6 hours
  • Water demand: approximately 5 litres per 20 kg
  • Temperature resistance: 70º
  • Application temperatures: Do not apply in temperatures below 5ºC or above 30ºC

Note : all the data given was obtained at a temperature of 23ºC and 50% relative humidity

Guarantee

We agree that Weber products meet the product specifications and will be free from any defect. Any guarantee with regard to the performance of Weber products will be subject to the professional and practical application of Weber products in accordance with our instructions and specifications.

However, we have no influence over specific site conditions and therefore, if in doubt, the user should first carry out sufficient tests to ensure that the product is suitable. In special cases, obtain advice. Should our product prove defective, we undertake to replace any defective material. This guarantee will fall away in the event of Weber products being contaminated by the addition of sand, cement or substance other than recommended by us.

Storage

When stored, unopened in a dry place at temperatures above 5ºC, shelf life is 9 months from date of manufacture.

Documentation

Send or download the documentation

You can either send the documentation to an email address, or download it.

Preparation & Application

Surface Preparation

The following minimum curing periods should be observed before tiling commences:

  • New concrete floors: 28 days
  • New screeds: 28 days
  • New brick walls: 28 days
  • New plastered walls: 28 days

The walls or floors to be tiled should be wood-floated and not steeltrowelled or power-floated. Ensure that all surfaces are clean, dry, sound and free from dust, grease or any contamination that could impair bonding. Make good any unsound areas and remove flaky or peeling layers before tiling. 

Organic growth must be removed and the spores killed using household bleach. PVA paint and gypsum plaster must be chipped to expose 80% of the substrate. Enamel paint and bitumen should be scraped and chipped to expose 80% of the substrate.

Do not use a solvent or heat to remove bitumen from the surface. Existing tiles must be thoroughly cleaned using a suitable cleaner. Rinse using clean water. Smooth-, off-form-, shutter- or powerfloated cement surface should be acid washed to remove laitance. Rinse well with water.

Highly absorbent surfaces must be primed using a mix of 2 volumes of weber.prim Plaskey WB250 and 1 volume weber.ad Key-it WB117. Apply to a thickness of approximately 2 mm using a blockbrush. Leave to dry for 24 hours.

Mixing

  • Combine a 20 kg bag of weber.set Ultra-flex with 5 litres of clean water and stir until completely free of lumps.
  • Allow the mixture to mature for 5 minutes and re-mix thoroughly. The consistency can be adjusted by adding a small amount of water.
  • Do not add too much water or attempt to extend the working time by adding more water as this will cause the adhesive to be weak with a tendency to crumble.
  • Do not mix more adhesive than can be applied within 1 hour.

Application

Spread adhesive using a notched trowel to a minimum bedded thickness of 3 mm on walls and 6 mm on floors. Heavily lugged, grooved or dove-tailed tiles must be back-buttered to fill any voids with adhesive before placing into wet adhesive. Press tiles firmly into wet adhesive with a twisting action. Use a rubber mallet to bed large or heavy tiles. Occasionally lift a tile to check that full contact is being made between the tile and the adhesive. Do not butt joint tiles.

Clean excess adhesive off the surface once tiles are firmly set using a damp sponge. Once the adhesive has hardened, only mechanical removal is possible. Minimum grouting joints for walls is 2 mm and 3 mm for floors. Adhesive must be allowed to dry for 6 hours before grouting commences.

Coverage

Depending on the nature and evenness of the surface and method of application, approximately 6 m2 per 20 kg bag when applied using a 6 mm notched trowel (wall tiling) and 4 m2 per 20 kg bag when applied using a 10 mm notched trowel (floor tiling) ie: based on a level/even floor.

Grouting

Ensure that the joints are free from tile adhesive and any other foreign matter. Allow 6 hours before grouting with weber.grout Tile Grout WB33. Allow 48 hours for sealed or non-porous surfaces. In wet or permanently wet conditions, replace the water in the mix with weber.ad Bond-it WB183.

Packaging, Health & Safety

General

  • Tiles should be installed providing for adequate movement joints.
  • Movement and expansion joints to be provided for at approximately 3 m centres externally or at 4 m centres internally in both directions or as per the engineer’s specifications.
  • All expansion and movement joints in the substrate must extend through the adhesive bed and tiles.
  • Tiles must have full contact with the adhesive, leave no voids.
  • Use only dry tiles - do not soak tiles.

Packaging

weber.set Ultra-Flex is supplied in 20 kg bags.

Safety Instructions

Contains cement, which is alkaline when wet and can cause skin irritation. Use eye protection and gloves and avoid prolonged skin contact. Avoid inhalation of dust. Wash skin contamination away with warm soapy water. Remove splashes to the eyes by prolonged irrigation and consult a doctor. Do not ingest.