Technical Bulletins — Facades

In this section you will find technical advice relating to facades which has been issued by the Weber technical team. From render maintenance and repair advice to general tips for using our products, and even guidelines for using our products in hot or cold weather conditions, this section is designed to ensure you're fully equipped to complete any project using our products. 

If you need to ask any questions, our technical team can be contacted by emailing, or you can call them directly on (01525) 722 100.

Lime bloom (or efflorescence) on brick wall

Lime bloom

Because cement is intolerant to certain conditions during the early stages of its hydration, an effect called lime bloom can occur.

More about lime bloom →

Ghosting blockwork — what is render ghosting?


Ghosting is an effect where an outline of the blockwork is visible through render. This is a result of penetrating dampness from the underlying masonry.

More about ghosting →

Halo rings render — monocouche render problems

Halo rings

Halo rings, or snakes, are rings of a lighter colour which occur during the render scraping process as a result of improper render application.

More about halo rings →

weberend LAC — basecoat exterior render mix

Finishing weberend LAC

Best practice advice on the finishing of weberend LAC prior to application of weberplast TF or webersil TF.

About finishing weberend LAC →

monocouche render house

Maintenance of through-coloured renders

Advice on maintaining our weberpral monocouche products — a range of low-maintenance, cementitious, through-coloured renders.

Maintaining through-coloured renders →

render miss marks

Miss marks

Miss marks occur when laitance is not removed from the render uniformly at the scraping stage.

More about miss marks →

render pump roughcast finish

Using a render pump to achieve roughcast finish

There's a wide range of machinery available for pumping renders when a rough cast finish is desired.

How to achieve a pumped roughcast finish →

Inconsistent colour render monocouche

Monocouche colour consistency

It's important that the final finish of render is uniform and flawless — a number of factors can influence the final cured shade of a mortar mix. 

More about colour consistency →

crack in render substrate

Repair advice for weberpral monocouche

Advice for carrying out repairs to weberpral monocouche render:

  • Repair method 1: For aesthetic repairs to fine cracks
  • Repair method 2: For remedial to damaged/hollow or defective render 

Repairing weberpral monocouche →

Rendering over existing rendered/painted backgrounds

Weber do not advise rendering over existing renders as there is a high potential for cracking or debonding, but we offer some advice on potential solutions.

About rendering over existing render and painted background →

weberend aid - stipple render from Saint-Gobain Weber

Use of weberend aid

weberend aid is designed as a stipple pre-treatment for substrates.

About using weberend aid →

Achieving a same-day scrape in colder temperatures

As the seasons change, weather can cause many challenges for rendering.

More about scraping monocouche →

rendering in winter

Winter working

Winter working conditions can cause a number of problems with rendering and working onsite.

About working in winter →

Rendering in hot weather

Hot weather working

Hot weather means rapid drying conditions, which can impact negatively on freshly rendered elevations.

About working in hot weather →

weber render systems

Rendering onto different backgrounds

Modern building practices sometimes mean several different substrates on the same project which require a matching finish.

Find out how to achieve the perfect finish →

webertherm M1 — mineral one coat external insulation render for use with EWI systems

Applying webertherm M1 onto masonry

Advice on applying webertherm M1, a component of the webertherm XP external wall insulation system, to masonry backgrounds.

How to apply webertherm M1 onto masonry →

using meshcloth for stress relief

Using meshcloth

Advice on using weber standard meshcloth to reinforce monocouche renders.

More about meshcloth →

Using mesh cloth to relieve in stress in render

Stress relief in render

Advice on adequate stress relief in render around openings to avoid cracking.

Ensuring stress relief in render →

external wall insulation board fixing

External wall insulation board fixing

Advice on best practice for fixing insulation boards.

More about fixing insulation boards →

Use of render beads with weber render

Render profile beads with scraped finished renders

Technical advice on the use of beads to form arises, features and stops. 

More about using beads with render →

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