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WeberSpec Smooth Rapid Floor

Third party certifications:
  • QA Certificate

    Certificate type

Saint-Gobain Weber

Fibre-reinforced, rapid drying, self-smoothing screed system for floors (rapid speed of final finish application). Suitable for underfloor heating.

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Description

Fibre-reinforced, rapid drying, self-smoothing screed system for floors (rapid speed of final finish application). Manufactured in accordance with BS EN 13813: 2002. Complies with BS 8204-7.

Components:

- Primer/ Bonding coat (weberfloor 4716 primer):

  • Styrene acrylate dispersion which can be diluted with water. Designed for pre-treating all substrates prior to the application of weberfloor products.
  • Regulates the porosity of the substrate.
  • Improves the adhesion and flow of flooring products.
  • Reduces the formation of pinholes in the levelling layer.
  • For use on in-situ and pre-cast concrete, lightweight concrete, ceramics, stone, timber, and steel plate.

- Mesh reinforcement (weberfloor 4945 - not for use with underfloor heating):

  • Glass fibre reinforcement net with an alkaline ­resistant impregnation.
  • Specifically for use on weak substrates or in case the screed is laid non­-bonded.
  • Reinforces weberfloor base and renovation screeds in floating floor applications.

- Base screed (weberfloor fibre rapid 4320 - for use where required):

  • Rapid drying self-smoothing base and renovation screed.
  • Incorporates Low Dust Technology™, which provides a strong base layer for receiving tiles or a thin topping screed, and reduces the amount of waste and airborne dust produced during application.
  • Can be pump or hand applied.
  • Rapid drying, allowing an early overlay when compared to traditional sand/ cement or concrete screeds.
  • Low alkalinity.
  • Casein-free.
  • For use on concrete, sand/ cement screeds, anhydrite screeds, wooden boards (contact weber for further details), under-floor heating/ warming, insulation boards, suitably bonded existing tiles and bitumen.

- Damp proofing membrane (weberfloor DPM - for use where required):

  • Two-coat epoxy resin damp proofing system.
  • Easy to apply onto concrete and cement based levelling compounds.
  • Suppresses the passage of moisture up to 98% RH.
  • Reduced project timescale, allows early installation of floor finishes.
  • Resistant to a wide range of chemicals.

- Sound insulation (weberfloor 4955 dB - for use where required):

  • Thin sheet impact sound insulation, 2.5 mm-thick.
  • Easy roll out, and cut to fit installation.
  • Compatible with heated floors.
  • Sustainable – made of 60% recycled glass.

- Surface treatment (weberfloor smooth rapid 4160):

  • Rapid drying self-smoothing thin topping screed.
  • Pre-treated of weberfloor 4716 primer.
  • Can be pump or hand applied.
  • Good spreading and smoothing characteristics.

The system can be covered with:

  • Tiles.
  • Timber laminate.
  • Flexible floor coverings (e.g. vinyl/ linoleum) when used in conjunction with weberfloor 4160.

Weber will only guarantee the products which form the system. Where membranes/ DPM by others are used, these will require a guarantee by the membrane/ DPM manufacturer.

Please ensure movement joints coincide with the building and can be used to assist with sequencing of application.

Preparation/ Recommendations:

  • The substrate should be clean, free from dust, grease and other impurities that might prevent adhesion. All damaged and friable material should be removed. Leaving a good sound, solid substrate, this remedial work should then be a minimum 20 mm deep from the existing datum and 200 mm in length and width. This 200 mm should encapsulate the damaged area by a minimum of 50 mm. Should the damaged area be greater than 200 mm the excavation should always be a minimum of 50 mm past the furthest point.
  • Prior to the final floor finish being applied, please ensure the weberfloor is suitably protected once cured.
  • Reaction to fire clarification has not been determined/ tested and therefore this product is not suitable to be left exposed. For further details, please refer to table ZA.1.1 (page 22) of BS EN 13813 and contact Weber technical team. Prior to installation of Weber floor products, please consult with your local building control authority or equivalent to ensure a reaction to fire classification is not required - especially for onerous areas such as protected shafts, fire exits and fire corridors.
  • In compliance with Scotland Technical Handbook (section 2 – 2.2.6 Combustibility), this product should not be used in domestic buildings that exceed 18 m in storey height when installed onto a separating floor,. Please refer to the Scotland Technical Handbooks for further information.

Please note that weberfloor fibre 4320 should not be painted or used without a floor finish.

Consult manufacturer's literature for specific mixing instructions.

General information
Specification data - Fibre-reinforced levelling screed mixes
Product Reference

WeberSpec Smooth Rapid Floor

Primer/ Bonding coat

weberfloor 4716 primer

Minimum of two coats.

Mesh reinforcement

Not required

weberfloor 4945 glass fibre mesh

Not compatible with underfloor heating; if underfloor heating is to be used, select 'Not required'.

Base screed

weberfloor fibre rapid 4320

Damp-proofing membrane (DPM)

weberfloor DPM

For a fully bonded construction.

Sound insulation

weberfloor 4955 dB

Edged must be fully sealed, otherwise joint adhesive tape weberfloor 4970 may be required.

Surface treatment

weberfloor smooth rapid 4160

For use prior to the overlay of flexible floor coverings such as vinyl or linoleum.

Accessories/ Other requirements

Consult manufacturer for details and insert requirements.

Standard product features

Technical characteristics:

  • Application temperature: 10–25°C.
  • Minimum substrate strength: 1 N/mm².
  • Relative humidity of substrate: <75%.

- Primer/ Bonding coat (weberfloor 4716 primer):

Coverage:

  • Concrete: 0.15 kg/m².
  • Lightweight concrete, timber, marble: 0.2 kg/m².
  • Dry porous surfaces: 0.2–0.4 kg/m².

- Base screed (weberfloor fibre rapid 4320):

  • Minimum thickness: 5 mm (bonded); 20 mm (unbonded); 25 mm (floating insulation with weberfloor 4945 glass fibre mesh). Maximum thickness: 50 mm. Minimum 15 mm thickness above heating pipes for domestic use, and 20 mm minimum for high traffic areas.
  • Water requirement: 5 L/ 25 kg (20%).
  • Compressive strength (to BS EN 13813): C30.
  • Flexural strength (to BS EN 13813): F7.
  • Flow rate: 220–235 mm.
  • Material consumption: 1.7 kg/m²/mm.
  • Hardening time (in normal conditions): Before foot traffic: 1–3 hours; before tiling: 12 hours; before final covering: 2–4 days (dependent on layer thickness and drying conditions).
  • Release of corrosive substances (to BS EN 13813): CT.
  • Shrinkage (after 28 days): <0.05%.

- Damp proofing membrane (weberfloor DPM):

  • Adhesion to concrete (to BS EN 1542: 1999): 3.9 N/mm².
  • Bond to new concrete: >2.5 N/mm².
  • Average coverage per pack: 7.5 m² (over two coats).
  • Minimum temperature use: 5°C.

- Sound insulation (weberfloor 4955 dB):

  • Thickness: 2.5 mm.
  • Colour: White/ Yellow.
  • Composition: Polyethylene (PE) and Glasswell.
  • Impact sound resistance: Refer to Weber technical data sheet.
  • Maximum compressibility: 6%.

- Surface treatment (weberfloor smooth rapid 4160):

  • Thickness (nominal): 10 mm; minimum: 2 mm (6 mm on lightweight concrete); maximum: 30 mm.
  • Water requirement: 5 L/ 25 kg (20%).
  • Compressive strength (to BS EN 13813): C30.
  • Flexural strength (to BS EN 13813): F7.
  • Shrinkage (after 28 days): <0.06%.
  • Flow rate: 240–255 mm.
  • Material consumption: 1.7 kg/m²/mm.
  • Hardening time (in normal conditions): Before foot traffic: 1–3 hours; before final covering: 12 hours (tiles) or 1–3 days (timber) (dependent on layer thickness and drying conditions).
  • Release of corrosive substances (to BS EN 13813): CT.
  • Wear resistance: RWFC 550.

Product Options

Primer/ Bonding coat:

The substrate should be vacuum cleaned, prepared and primed with weberfloor 4716 primer, according to the manufacturer's instructions (e.g. mixing recommendations). Priming improves the screed’s adhesion to the substrate and prevents the formation of air bubbles and dewatering of the screed. Dry and very porous substrates (cast-in-situ concrete floors) may need to be treated twice. If the screed is applied in more than one layer, each layer must be primed.

Mesh reinforcement:

  • Mesh gauge: 10 x 10 mm.
  • Consumption: Approx. 1.1 m² with overlapping.
  • Colour: White.

Surface treatment:

Domestic and commercial thin coat topping screed, to be applied to a maximum thickness of 30 mm. Consult manufacturer for further details.

Third party certifications
  • Declaration of Performance (DoP): 150419
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