Weber - Weber Niv Dur

Weber - Weber Niv Dur

nivdur technic

For levelling:

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
Existing painted floors (epoxy, polyurethane, acrylic)
Floating floors

Suitable for covering with:

Tiling
Flexible floor coverings (carpet, vinyl)
Parquet flooring
Certain floor paints

In situations that will be very humid, such as bathrooms, weber.sys protec tanking system may be applied over weber.niv dur. High-performance, fibre-modified, self-smoothing, self-levelling renovation screed (3 – 30 mm)

About this product

weber.niv dur is a high-performance, fibre-modified, cement-based, selfsmoothing, self-levelling, rapid-drying floor screed.
It is used for correcting surface irregularities on difficult surfaces, including wood, in dry interior situations.

Constraints

Not suitable for:
Exterior use
Use in damp areas
Industrial areas
As a wearing surface

Features and Benefits

Excellent levelling properties
Can built up to 30 mm
Rapid drying (light foot-traffic after 3 hours)
Improved bond to difficult substrates
Flexibility to absorb limited movement, e.g. under-floor heating and wood
Fibre modified for increased resilience
Can be pump-fed for large areas by approved contractors

Preparation

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 weber.niv dur.

Timber should be rigid and strong enough to support the expected load, 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 is recommended to improve adhesion, reduce air bubbles, protect wooden substrates and prevent de-watering of the leveller. It may not be necessary for medium porosity substrates, but all others must be primed, and the primer allowed to dry, before applying weber.niv dur.

Very porous or slightly porous surfaces should be primed with weber PR360 and allowed to dry for 1 to 4 hours.

Completely impervious surfaces and timber should be primed with weber PR301 and allowed to dry for 2 to 3 hours.

WG 210 fibre glass mesh can be used to reinforce weber.niv dur in critical applications.

The mesh should be fixed to the substrate to prevent it floating to the surface during the application of the screed.

Mixing

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 one minute until a fluid, homogenous paste is obtained.
Allow the mix to stand for 2 minutes before use, and use within approximately 20 minutes. At higher temperatures this time will be reduced.

Application

Pour the mixed weber.niv dur onto the floor. It is self-smoothing, but the thickness may need to be adjusted with a straight edge or float. Use a float to ensure that any pores are filled and release trapped air.

The minimum application thickness is 3 mm.
If a second coat is required, apply it as soon as the first coat has hardened. If more than 24 hours have passed between layers, prime the first layer with weber PR360.

weber.niv dur 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.

Where WG 210 fibre glass mesh is used with weber.niv dur the minimum application thickness is 10 mm.

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 Niv Dur

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