Ideal Weather Conditions for Rendering

Things don’t always go as planned when working on a construction, and sometimes poor weather conditions can affect whether or not you’re able to start rendering.

The ideal temperatures for installing render varies between manufacturers, however it is advised that the optimal temperature for applying the renders should be between +5 and +25 degrees Celsius.

Here is our advice on what to do when the weather conditions aren’t ideal for rendering:

Working in Hot Weather

We advise that if it’s a warm day it’s best not to render in direct sunlight, as this is the most probable cause of the render drying out too fast. Render that has dried out too fast can result in cracking and damage, or even a patchy finish.

An old trick that lots of renderers use is to start before the sun has fully risen (many of our installers start out at around 5 am). Start by applying on a wall that is not exposed to sunlight, and follow the sun around the building working on the walls that are in the shade. This allows you to continue to work in sunny weather, but prevents issues with the render drying out too fast in direct sunlight.

Another way to avoid cracking when the weather conditions for rendering are not ideal is to wet the walls before application, or even better apply a water based primer. It will limit the absorptive capacity of the substrate. During hot weather, ordinary masonry will have dried out and the absorptive capacity of the substrate will be extremely high. Using a primer ensures that the substrate is prevented from absorbing too much water from the render and causing it to crack during the curing process.

Working in Cold Weather

Cold weather means that the render may not dry out fast enough. If this is the case, the render may retain moisture for too long and thus become susceptible to damage from this trapped moisture.

Mineral render is a great option when it comes to applying thin coat render in colder conditions. This is because it’s a dry-mix render and is therefore much more quick-drying than our ready-to-use thin coat renders. It also has much faster drying times since this is applied in a very thick layer, which increases its curing time.

When it comes to the basecoat layer, a winter adhesive has been specifically designed for use in colder temperatures when the weather conditions are not ideal – it can be used even down to 0 degrees. When using this, you are ensuring that you have a strong and crack-free surface onto which you can apply your thin coat renders. By doing this, you increase your chances of achieving a great finish – even when the weather is not ideal.

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