What time of year is best for rendering?

The best time of year for rendering is the spring and autumn months. It’s a time when the air temperature is most optimal and indicates moderate values. Equally important is the appropriate level of humidity – the higher it is, the more conducive to even hardening of render mortars. Failure to comply with the prevailing conditions and time of year can have disastrous consequences.

Rendering after the core and shell stage

We should not forget that the newly built walls work as the building settles and the walls shrink. Therefore, we recommend application a rendering system after the core and shell stage. The optimal situation is when we start the season with the completion of the raw state of the building.

Then, we must wait at least 6 months before we start rendering our house. It mentions the laying and drying of the interior render, the completion of the roof, and the integration of windows. We can start building our render only after settling the building’s foundations. Otherwise, our render walls will begin to crack during extreme weather conditions.

Rendering during hotter and colder weather conditions

The basic rule is to render walls when the outside temperature is between 5°C to 20°C. The best seasons for this type of work are thus spring and autumn. Application at cold temperatures and winter months can lead to the loss of adhesion of the mortar. It is due to the slower drying conditions.

Adverse weather conditions and cold weather can completely stop this process and cause white discoloration of the facade. Too low temperatures can also result in “freezing” of the render, which unfortunately can result in cracking and damage or even a patchy finish.

We also do not recommend applying thin coat render systems at hot temperatures exceeding 20°C. In this situation, our render will dry too quickly, and the joints of the various stages of mortar application will remain visible on the facade.

The render being applied during hot weather can further complicate the work, as the render dries during the application, preventing equal distribution. The effect of the rendering during sunny weather can be indelible discoloration, render cracking, and falling off the wall render.

To avoid the undesirable effects of rendering at hot weather, you can use protective nets. Another solution is to plan the work when the walls are not exposed to direct sunlight, and to avoid the hottest hours when the facade heats up. 

Rendering during windy conditions

The second factor to consider is wind. You should not render during windy weather, as it can cool or dry out the facade. To avoid this, it is worth choosing the protective nets that will minimize the impact of this factor on the rendered building. The first 24 hours after applying the render, during which it is most vulnerable, play a predominant role here.

Rendering during wet weather

The wall for rendering should be dry and dust-free. The render application on walls exposed to high humidity leads to discoloration and falling off the wall render. As long as the render has not been dry, it must be protected from the rain, which can wash wet render off the surface.

After doing all the work, you can leave the scaffolding with a protective net. For silicate render, humidity should not exceed 60%, as it may impact the degree of efflorescence. Thus, we do not recommend applying them in early spring and late autumn due to the large amounts of rainfall during these periods.

Look before you leap

I bet you’d want your house finally look like from the visualization. However, for your investment, it is not worth rushing the work on the exterior facade. It’s better to wait for favorable weather conditions and to make sure that the team we choose for house rendering knows how to protect the walls from adverse weather conditions. We promise that it is worth it. It will look beautiful!

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