How the Weather Affects Your Render

The weather can affect your home’s render in many ways. As a natural and porous material, render is susceptible to damage from moisture, temperature extremes, UV exposure, and other environmental factors.
However, there are steps you can take to protect your render and keep it looking its best, even in harsh or changing weather conditions.


Moisture and Humidity

Excess moisture is one of the biggest threats to render. Damp or humid conditions can lead to the growth of mould, mildew, and algae on the render surface, especially in warm or tropical climates.

To prevent moisture-related growth, dry any water-damaged render areas as soon as possible. Trapped moisture can significantly increase the risk of growth.

If mould, mildew, or algae do appear on the render due to moisture. Clean the affected area using a mixture of bleach and water or a commercial mould/mildew remover. Rinse the area thoroughly when finished and allow it to dry completely.

For ongoing protection, apply a fungicidal render sealant, which helps prevent the growth of fungi, mould, and mildew. Re-apply the sealant periodically, especially after cleaning mould or mildew from the render.


Cold and Freezing Temperatures

In colder weather, freeze/thaw cycles can cause render to crack or crumble. To protect render from freezing and thawing damage, instal insulation such as house wrap behind the render or apply a weather-resistant render sealant. The sealant will help stabilise the temperature of the render and reduce contraction/expansion that can lead to cracks.

If cracks do form due to freezing, repair them as soon as possible using a render patching compound. Apply the patch when temperatures are above freezing and the render is dry to prevent the material from re-cracking.

Harsh Sunlight and UV Exposure

Prolonged sun exposure can cause render to fade, chalk, and deteriorate more quickly. To protect render from sun damage, apply a UV-blocking render sealant. Look for a sealant that contains silicone or acrylic and is specifically designed for use on exterior render or masonry surfaces. Re-applying the sealant every few years will help maintain its UV protection. Also, limit time in direct sunlight when possible by installing roof overhangs, trellises, or other shade structures over the render.

Lighter-coloured renders that contain titanium dioxide or other UV-resistant materials tend to be more resistant to sun damage. Render with a smoother, more solid surface is also less susceptible to UV deterioration than a highly porous render.

If your render is already sun-damaged, cleaning and re-sealing it can help restore its appearance and protect it from further damage.

By understanding how different types of weather impact render and taking the proper protective steps, you can keep your home’s render looking new longer. With regular maintenance like cleaning, sealing, and making adjustments to moisture and ventilation. Render can withstand environmental conditions and retain its appearance for many years. With the right care and protection, render can be a durable and attractive siding material, even in harsh or changing weather conditions.