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Weber Saint-Gobain - Official website of the company

weberend LAC rapid

weberend LAC rapid
weberend LAC rapid


Product Benefits

  • Rapid drying - 24 hour dying time*
  • No primer required
  • Polymer modified for high bond strength
  • Factory batched for consistency
  • Practical benefits of smooth application, speed, economy andlong shelf-life

*At temperatures between 12°C and 30°C

Rapid drying, lightweight adhesive render coat for use as part of the webertherm XM or weberend MT systems.  Ideal for fast track installation and off-site manufacture.

Product Features

About this Product

Rapid drying, lightweight adhesive render coat for use as part of the webertherm XM or weberend MT systems

Features and Benefits

  • Ideal for fast track installation and off-site manufacture
  • No primer required
  • Rapid drying - 24 hour drying time*
  • Polymer modified for high bond strength
  • Factory batched for consistency
  • Practical benefits of smooth application, speed, economy and long shelf-life

*At temperatures between 12°C and 30°C


Do not apply

  • If frost is forecast within 24 hours of use
  • In damp/wet conditions
  • In temperatures below 5°C or above 30°C
  • On elevations in direct sunlight or where the substrate is hot

Technical Data

Technical Services

Weber's Technical 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) 722110

Email: technical(at)

Sales Contact

Tel: (01525) 722100



Send or download the documents

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

Preparation & Application


Mix the weberend LAC rapid with a paddle mixer by adding clean potable water only to achieve a thick creamy consistency. Do not over mix. If the material has been allowed to stand for 5-10 minutes, it may be necessary to remix prior to application. Do not add additional water.


Bonding insulation

Apply to the back of the insulation boards in 4 vertical strips 100mm wide, 25-30mm thick.

Meshcloth coat

Coat the insulation boards with the adhesive approximately 3mm thick and lay in the meshcloth. Once the initial coat has started to ‘take-up’, apply a second layer of adhesive mortar, to produce a sandwich approximately 6mm thick, totally encapsulating the meshcloth.

Synthetic finish: sponge finish the surface to achieve a flat in plane background. Allow to fully dry and shrink. The drying period will vary according to weather conditions.

Note: weberend LAC rapid is white in colour and is designed to be over-coated without requiring a primer. In conditions with a relatively consistent temperature falling between those indicated below, minimum curing times would be: 

Consistent temperature beweenMinimum curing time
12°C -30°C24 hours
5°C - 12°C48 hours

Consideration should also be given to the relative weather conditions in conjunction with the elevation, panel size, merited against the workability and feasibility of a rapid drying product.

Spillages and stains are difficult to remove so:

  • Protect vulnerable areas thoroughly
  • Mix mortar in plastic containers using a paddle mixer to facilitate cleaning
  • Don’t mix too much material at one time
  • Wear protective clothing

Packaging, Health & Safety


weberend LAC rapid is packaged 3-ply 20 kg bags with batch code and description on the side.

Coverage / Yield

UseNominal thicknessCoverage per bag
Bonding insulationN/A6.6m2
Meshcloth coat6mm3m2

Storage and Shelf Life

When stored unopened in a dry place at temperatures above 5°C, shelf life is 12 months from date of manufacture printed on the side of the bag.

Health and Safety

Contains: white Portland cement and calcium dihydroxide. Causes skin irritation. Causes serious eye damage. May cause respiratory irritation. If medical advice is needed, have product container or label at hand. Keep out of the reach of children.

Read label before use. Avoid breathing dust. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Immediately call a doctor. Dispose of contents/container in accordance with local/regional/national/international regulations.

For further information request the relevant Material Safety Data Sheet from Weber.