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weberpral

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  • BBA Agrément Certificate

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Saint-Gobain Weber

Proprietary one-coat through-coloured cementitious render system.

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+44 (0)1525 718877 www.uk.weber
Application

Suitable for use on:

  • New or existing sound brickwork, blockwork or concrete.
  • Masonry with a suitable strength and compatible with a 1:1:6 mortar mix.

The installation must capable of resisting all dead loads and design live loads, including impact and wind loads, and accommodate all thermal movements without damage.

System installation is to be strictly in accordance with Saint-Gobain Weber specification. Please note that any other manufacturer's products used within the system will invalidate the guarantee, and the performance cannot be supported.

All rendering must be in accordance with the relevant recommendations of BS 13914-1: 2005, Design, Preparation and Application of External Rendering and Internal Plastering, BS 8000: Code of Practice for Plastering and Rendering. Consult manufacturer for further details.

Description

Proprietary one-coat through-coloured cementitious render system.

Features and benefits:

  • Provides weather protection.
  • A wide range of finish coat colours are available.
  • For application to a finished thickness of 15–25 mm.
  • Provides resistance to impact damage and cracking.
  • Can be mixed by either hand or machine - consult manufacturer for details.
  • BBA and BBA environmental profile approved.

Applications:

Suitable for use on:

  • New or existing sound brickwork, blockwork or concrete.
  • Masonry with a suitable strength and compatible with a 1:1:6 mortar mix.

The installation must capable of resisting all dead loads and design live loads, including impact and wind loads, and accommodate all thermal movements without damage.

System installation is to be strictly in accordance with Saint-Gobain Weber specification. Please note that any other manufacturer's products used within the system will invalidate the guarantee, and the performance cannot be supported.

All rendering must be in accordance with the relevant recommendations of BS 13914-1: 2005, Design, Preparation and Application of External Rendering and Internal Plastering, BS 8000: Code of Practice for Plastering and Rendering. Consult manufacturer for further details.

Recommendations:

  • Installation to be carried out by a contractor recommended by the system manufacturer.
  • The use of movement joints will help reduce stress build up in the substrate and reduce the risk of cracking. Movement joints must continue through the render to the substrate - consult manufacturer for further details.
  • Where the product is exposed to severe impact (e.g. some industrial sites) or applied over existing background cracks, precautions may be required to reduce the risk of damage.
  • All the major building components must be fitted. This includes copings, cappings and flashings, windows and doors, soffits and fascias. The fittings must be detailed to protect the finished render from staining due to localised water run-off. Flue pipes, air bricks and weep holes should also be in final position prior to the application of render.
  • Ensure that supplies of materials are sufficient to give consistent and uniform colour and texture. To minimize variations in colour use materials from the same batch, avoid dry jointing and continuous surfaces must be completed without breaks.

General information
Specification data - Silicone renders
Product Reference

weberpral

Preparation

Not required

Weber CL150 Fungicidal Masonry Wash

Consult manufacturer for details.

Weberend aid

Helps to provide a mechanical key. Applied 3 mm-thick.

Render -
First coat

weberpral D

Can be used to achieve a scraped or ashlar finish.

weberpral M

Can be used to achieve a scraped, ashlar, spray roughcast or dry dash finish.

weberpral MF

Can be used to achieve a scraped or ashlar contemporary modern aesthetic.

Colour

Consult manufacturer for available colours and insert requirements.

Finished thickness

15–25 mm. Consult manufacturer for details and insert requirements.

Glass fibre reinforcement

Not required

webermesh standard

To be installed in accordance with manufacturer's recommendations. Balanced, open weave glass fibre meshcloth, coated for alkaline resistance. 1 x 50 m roll.

Surface treatment

Not required

weberend protect

Accessories/ Other requirements

Consult manufacturer and insert requirements.

Standard product features

Technical characteristics (to EN 998-1):

  • Reaction to fire: Euroclass A1, 'non-combustible'.
  • Water absorption: Class W2.
  • Durability (adhesion after weathering cycles): ≥0.2 N/mm².
  • Durability (water permeability after weathering cycles): ≤1 ml/cm².

Coverage:

  • weberend aid: 4 kg/m² (25 kg bag).
  • weberpral (at 15 mm thickness): 21 kg/m².
  • webermesh standard: 45m² per roll.
  • weberend protect: 5 m²/L.

Product Options

Preparation:

- Weber CL150 Fungicidal Masonry Wash:

For existing substrates, or where required on new substrates, drench apply CL150 wash and leave for 48 hours, then brush down to remove all moss/ growth.

- weberend aid:

Apply with a hawk and trowel in a tight layer 2–3 mm thick to the substrate. Texture the surface using a well loaded roller. Apply no more than 2–3 m² before texturing. It is important that the final texture achieved should be deep, heavy stipple finish with a minimum textured depth of 5–10 mm. Insufficient key will inhibit the render bond; this is particularly relevant on low suction substrates where capillary absorption is minimal. Leave to cure for 48 hours.

Render:

- First coat:

  • Mix and apply to specified thickness - this will be 3 mm more than the finished thickness. Rule off with a straight edge to achieve satisfactory in-plane surface. Remove all trowel marks, and after partial take-up, scrape back 2–3 mm to develop the final colour and texture required.
  • The finished thicknesses as appropriate: 15 mm for sheltered areas; 20–25 mm for application in areas subject to severe or very severe weather conditions in accordance with BS EN 13914-1: 2016. Consult manufacturer for further details.

- Glass fibre reinforcement:

Weber recommend incorporating webermesh standard meshcloth into the weberend aid key coat or to the first pass of the weberpral first coat, to areas of typical stress points in the construction.

- Surface treatment:

  • weberend protect is a surface treatment for protecting render. Prevents ingress of most types of surface contamination, including water, oil and graffiti whilst maintaining the surface aesthetics and allowing the substrate to breathe.
  • Applied by using low pressure spray, brush or roller.

Accessories/ Other requirements:

Render only beads, if required by the system or product, or if specified, shall be of appropriate design, gauge and material - consult manufacturer for details. Structural, temporary or bead fixings shall be of suitable strength and durability. Some available accessories include:

  • Render only base (drip) beads.
  • Stop/ corner beads.
  • webersil P: Provides change of colour and increased weather protection.

Where window frames incorporating window cills are to be provided by others, then the cill must project sufficiently beyond the outside line of the Saint-Gobain Weber render system to a recommended 40 mm minimum - consult manufacturer for further details.

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