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Our view on rendering in hot weather

30.06.2020

Our view on rendering in hot weather

If you’re thinking of rendering this summer, well then this is all the information you need to know to achieve the best high quality result.

Silicone render, acrylic render and even Mosaic renders can have problems when applied in extreme heat – this is why it is essential for you to follow the instructions on the bucket and/or data sheet for that specific product (this can be found on the EWIPro website).

What’s the best temperature to render in?

Most traditional render systems have a better finish if applied in regular weather conditions – ideally between 5oC and 25oC, with no rain, wind or snow. However, sometimes this might prove difficult, especially during summertime. So it is vital that the challenges of applying render in contrary weather conditions are understood.

In hot weather,one tip for the application process is to start early in the morning. As you do this you can also avoid the walls that are in direct sunlight – for example apply to a wall adjacent to the sunlight and let the sun follow you as you move around to each wall. This way it will allow you to work in sunny weather, whilst avoiding any drying/curing issues that the direct sunshine may cause.

*Render that has dried out too fast can result in cracking and damage, or even a patchy finish.*

Using primer to help render in warm conditions

Another method to avoid drying issues such as cracking in hot is to dampen the walls before application, or take some tips from our installers and apply the Water Based Primer. This primer limits the absorptive capacity of the substrate. During extreme heat, ordinary masonry will have dried out and the absorptive capacity of the substrate will be high. Using this primer ensures that the substrate is prevented from absorbing too much water from the render and causing it to crack during the drying process.

For a thin coat render systems, it is advised to use Fibreglass Mesh embedded within the basecoat layer. This being the same with the first layer of Monocouche render. This is due to the Fibreglass Mesh being able to increase the strength of the entire system, so when the render shrinks during the curing process, the mesh will help prevent cracking.