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Weber Saint-Gobain - Official website of the company

weberend LAC

weberend LAC
weberend LAC

Product Benefits

  • Bedding coat for meshcloth systems, 
  • Bonding coat for plastic or mineral fibre lamella insulation systems 

A polymer-modified dry powder cement-based render mortar


When used in strict accordance with manufacturer's instructions and within an appropriate system, Weber renders will have a minimum life of 10 years.

Product Features

About this Product

weberend LAC is a low density, polymer-modified dry powder cement based mortar.

This product forms part of a number of approved insulation systems.

Features and Benefits

  • Low mass for reduced shear load
  • Polymer modified for high bond strength
  • Factory batched for consistency
  • Practical benefits of smooth application, speed, economy and long shelf-life
  • Technical support from a Quality Assured company
  • Established track record in varying climatic conditions
  • Forms part of a number of approved insulation systems


The quality of application of this material depends on suitable operative skills and product familiarity.

Restrictions on weather conditions during application and curing must be respected.

Sound trade practices and printed instructions must be followed.

Good access and appropriate protection must be provided.

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) 722110
Fax: (01525) 718988

Sales Contact

Sales, England and Wales
Tel: (01525) 722100
Fax: (01525) 718988

Sales, Scotland
Tel: (0141) 445 0121
Fax: (0141) 445 0122

Sales, Ireland
Tel: (028) 9335 2999
Fax: (028) 9332 3232


Product Datasheet

Material Safety Datasheet

Declaration of Performance (DoP)

Send or download the documents

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

Preparation & Application


Mix weberend LAC by adding clean water only to achieve a thick creamy consistency.


The adhesive is applied to the back of the insulation boards in 4 vertical strips 100 mm wide, 25 - 30 mm thick.

Adhesive coat
Coat the insulation boards with the adhesive to a thickness of about 2 - 3 mm 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 6 mm thick totally encapsulating the meshcloth.
Mineral finish: lightly comb scratch to achieve a good mechanical key.
Synthetic finish: sponge finish to achieve a flat surface

Spillages stain and 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.

Good practice
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

Packaging, Health & Safety


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

Coverage / Yield

Use                     Nominal thickness  Coverage
Fixing insulant     N/A                          3 kg/m2
Meshcloth coat    6mm                        6.5 kg/m2

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.

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.

For further information, please request the Material Safety Data Sheet for this product.