Rendering in different weather conditions

Weber UK

It is widely acknowledged that one of the greatest challenges for renderers is the UK climate.  From October through to spring, rain, frost and limited daylight threaten the quality of the job, whereas in summer, warmer months can cause render to dry out too quickly, leading to an uneven finish.

Cement reacts with water, activating a chemical setting process, this process can change in different temperatures and it’s important to understand what can be done to prevent problems with your render.  We state that our products must be applied between temperatures of 5°C and 30°C – under or over these temperatures risks unintentional damage as the render sets, such as delamination or cracking.

When it comes to monocouche rendering success comes down to applying and scraping monocouche at the right time of day.

Why scrape the same day?

When the days are short and the nights are cold, it’s tempting to apply monocouche in the late afternoon and leave the scraping until the following morning. However, scraping on the same day has a whole host of advantages.

Easier scraping:

If the weather is cold or damp during the night, scraping first thing may not be possible, affecting your plans for the rest of the day. If temperatures are unusually high, on the other hand, you’ll spend more time scraping as the render will be harder. Most monocouche render is easiest to work with just a few hours after it’s been applied.

A more consistent finish:

Scraping render at different points of the set is the easiest way to create colour problems. While early scraping will produce a darker shade, a late scrape will make the finish much lighter. Both ends of the scale will also affect texture of the monocouche render.


Scraping on the same day is a great way to increase productivity. It means you can make one visit to the scaffold, complete the work in a single day, and not have to come in on Saturday if you spray on Friday. It also allows you to get a job done quickly when the weather window is limited.

How to achieve a same-day scrape in all weathers

Now you know why scraping on the same day is the best option, how do you actually achieve it?

In colder weather

To achieve a same-day scrape in cold weather, all you need is weber accelerateur monocouche. It is 100% pure and will not damage the colour of the render or your machine.  Once applied, it accelerates the initial set so that at 5°C, the scrape time will be the same as for standard monocouche at 20°C meaning the render is less susceptible to lime bloom. 

In warmer weather

To achieve a same-day scrape in warm weather, you will need weber monocouche retarder. Similarly, it will not damage the colour of your render of your machine as it is a colourless liquid. This product can slow down the scrape time in warmer months if applied correctly, meaning that rendering can still be completed at the standard of 20°C when it is up to 30°C.

To learn more about using this product effectively, contact our technical team at or call 01525 718877 option 2, or make an appointment with your regional application manager, who can visit you on site to provide a tool box talk on this subject.

Click Compare to help you choose the right product for your project, if you need further assistance please email