Rendering in bad weather conditions can be challenging, especially as colder months bring rain, wind, and frost. Quality render work relies on precise conditions, but sometimes schedules must adapt. Whether you’re a professional renderer or tackling a DIY project, here are some tips to keep your render work on track when the forecast isn’t ideal.

1. Use Weather-Resistant Products

Opting for weather-resistant renders can make a substantial difference. Products like silicone and acrylic renders are designed to offer increased resistance against moisture, UV rays, and temperature fluctuations. Silicone renders, for instance, are hydrophobic, meaning they repel water and allow walls to breathe, ideal for unpredictable weather. Products from EWI Store’s range, such as Nano Drex Silicone Render, are especially suited for weatherproofing, ensuring durability even under tough conditions.

2. Check Temperature and Humidity

Temperature plays a crucial role in the curing process of render. The ideal temperature range for rendering is typically between 5°C and 25°C. Rendering below this range can cause issues with adhesion and curing, leading to cracking or flaking. Conversely, higher temperatures can accelerate drying, compromising the final finish. Investing in a digital thermometer and hygrometer will help you monitor these factors precisely. Products like Winter Adhesive and Mineral Render are well suited to bad weather. Winter Adhesive works down to 0°C and Mineral Render can dry within a few hours.

3. Work with Protective Sheeting and Coverings

Unexpected rain or strong winds can cause delays or impact the finish of your render. Protective sheeting, tarps, or temporary shelters can safeguard your render surface from rain and wind while ensuring good airflow. Keeping the setup stable and secure, the last thing you want is your protection becoming a liability in high winds. Protective sheeting and correct storage are also essential on-site. Insulation boards like K5 can absorb water and many basecoat come as dry-mix bagged products. These require adequate storage and elevation.

4. Time Your Application Around Weather Patterns

Timing is key when rendering in bad weather. Track weather forecasts closely, choosing days when conditions are dry and temperatures stable. If you’re working with a quick-setting render, you might find shorter intervals with good conditions for application, even in unpredictable weather. For more traditional renders that require extended drying time, always opt for a stretch of stable weather whenever possible.

5. Consider Accelerators in Cold Weather

Rendering in winter or cold climates can be especially tricky. Adding accelerators to your render mix can speed up the curing process, reducing the time the render is exposed to the elements. However, follow manufacturer guidelines, as overusing accelerators may affect the render’s strength and longevity.

6. Beware of Frost and Freezing Temperatures

When temperatures dip, freezing can ruin render by causing water within the mixture to expand, potentially cracking the surface. Avoid applying render if the temperature is expected to drop below 5°C within the first 24 hours. For additional protection, consider using anti-freeze additives and insulated coverings to keep surfaces warm while the render cures.

7. Control Wind Exposure

Wind can quickly dry out the render, leading to inconsistencies in the finish and cracks. Set up windbreaks to reduce airflow around your rendering area, maintaining a steady drying process. However, ensure enough ventilation to prevent condensation buildup, as excessive moisture could equally compromise the result.

8. Take Advantage of Professional Products Designed for Wet Conditions

Some render products are designed specifically for application in less-than-ideal conditions. Mosaic Render, for example, is moisture-resistant and suitable for damp conditions, making it an excellent choice if you’re working close to the DPC (damp-proof course). Using a render that aligns with your specific climate challenges will help maintain the integrity of your project.

9. Finish with a Protective Coating

Once your render has cured, applying a protective coat can add a layer of defence against harsh weather. Render Guard or Brick Guard are two options that provide an additional sealant, ensuring water runs off surfaces rather than seeping in. These coatings not only protect against rain but also provide resistance to algae and dirt, helping keep your render looking fresh.