About this Product
High-performance, fibre-modified, self-smoothing, self-levelling renovation screed (up to 50 mm)
- Cement screeds, concrete slabs and pre-cast elements
- Floors with under-floor heating or under-tile warming
- Wooden flooring (plywood and particle board panels)
- Existing ceramic and rigid plastic tiles
- Floating floors
Suitable for covering with:
- Flexible floor coverings
- Parquet flooring
- Certain floor paints
In situations that will be very humid, such as bathrooms, webersys protec tanking system may be applied over weberfloor flex.
Features and Benefits
- Low Dust Technology™
- Excellent levelling properties
- Can built up to 50 mm
- Rapid-setting (light foot-traffic after 1-2 hours)
- Improved bond to difficult substrates
- Flexibility to absorb limited movement, e.g. under-floor heating and wood
- Fibre modified for increased resilience
Not suitable for:
Floors with rising damp
As a wearing surface
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.
Tel: (01525) 722110
Material Safety Datasheet
Declaration of Performance (DoP)
Preparation & Application
Switch off any under-floor heating systems at least 24 hours before application.
Substrates should be completely dry, hard, rigid and clean. Remove any traces of paint, plaster or laitance or other unsound materials. Thoroughly remove all traces of dust by vacuuming. Fill any large deep holes and allow to dry. Localised holes, up to a total thickness of 50 mm can be filled with weberfloor flex.
Timber should be rigid and strong enough to support the expected load with minimum deflection, normally at least 18 mm thick of a flooring grade and ventilated beneath. Screw wood panels to joists at least every 200 – 300 mm to prevent movement and ensure that every board edge is adequately supported by its adjacent board or joists and noggins. Ensure that all joints and cavities in the substrate are protected to prevent leakage.
Priming with weber PR360 is recommended to improve adhesion, reduce air bubbles, improve the flow of the screed and prevent de-watering.
weberfloor 4945 fibre mesh should be used to reinforce weberfloor flex in critical areas. The mesh should be fixed to the substrate to prevent it floating to the surface during the application of the screed.
Do not mix if the temperature is outside of the range +5°C to +30°C.
Thoroughly mix with 5 litres of water per 25 kg bag using a slow speed electric mixer (500 rpm) for at least two minutes until a fluid, homogenous paste is obtained.
Allow to stand for 2 minutes and use within approximately 20 minutes. At higher temperatures this time will be reduced.
Pour the mix onto the floor and spread evenly with a steel trowel, spatula or spiked roller. Do not apply at thicknesses above 50 mm. The product will self-smooth and most trowel marks will disappear.
The minimum application thickness for stabilising wooden substrates is 10 mm.
At 15 – 20°C weberfloor flex will have set sufficiently hard in 1 – 2 hours to withstand light foot traffic. At lower temperatures and greater thicknesses, these times are extended.
weberfloor flex is not intended as a wearing surface so the final finishing layer should be applied as soon as possible after drying has completed. If it is to be left for prolonged periods of time the surface should be suitably protected.
Allow for suitable expansion or control joints in screeds or slabs, by following them through the new topping.
Packaging, Health & Safety
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.
Health and Safety
Contains cement (Contains chromium (VI). May produce an allergic reaction). Harmful by inhalation. Irritating to eyes and skin. Keep out of the reach of children. In case of contact with eyes, rinse immediately with plenty of water and seek medical help. After contact with skin, wash immediately with plenty of soap and water. Wear suitable protective clothing, gloves and eye/face protection.
Other products in the range
High-performance, fibre-modified, self-smoothing, self-levelling renovation screed (up to 15 mm)
Self-smoothing levelling compound for uneven floor surfaces (up to 30 mm)
Styrene acrylate dispersion for use with tile adhesives, levelling compounds and webersys protect
A synthetic, water-based PVA concentrate for sealing and priming building substrates
A ready-mixed, under-tile tanking system to protect water-sensitive substrates from exposure to water