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How to Render in the Winter

01.01.2019

Rendering in the winter requires careful attention and correct procedures to ensure appropriate use of the materials. Working against the weather can present a challenge, especially when works are suspended due to poor conditions.

At EWI Pro, we specify that our materials should typically be used at temperatures no lower than +5°C, however we do have a few solutions to ease the challenges that winter presents.

Scaffolding

Ensuring that your work is protected against the weather is essential. Appropriate coverings (usually polythene sheeting) should be used to ensure that frost does not settle on the product surface overnight, water cannot be allowed to get in and harsh winds must be blocked out.

Remember that the sheeting should hang far enough away from the substrate that it won’t disturb the product on the wall, but also won’t allow wind to get behind it. This is essential for ensuring that the all-important setting process is not disrupted.

Using the right Materials

Winter Adhesive

If the weather is particularly bad, consider using materials that are designed for poor weather. The Winter Adhesive is ideal for this time of year; it’s completely frost-proof and waterproof and can be used at temperatures down to zero degrees. You can use this adhesive as both a basecoat and for fixing EPS insulation boards – so it really is an all-rounder.

Mineral Render

Mineral Render is slightly different to the traditional thin coat render. It’s not a ready-mix topcoat; instead, Mineral Render requires mixing with water before application. It contains cement, which is what makes it more fast drying, but the only downside to this is that it doesn’t provide a decorative finish on its own.

Mineral Render needs painting with Silicone Paint afterwards to provide a decorative finish, and provide a hydrophobic surface – sealing the render against water ingress and efflorescence.

Temperatures

With the exception of the Winter Adhesive, the vast majority of our materials can only be used in temperatures between +5°C and +25°C. Attempting to apply our products at the wrong temperatures will most likely lead to failure during the setting process.

The main issue is avoiding freezing overnight temperatures, the only way to do this is to keep a sharp eye on the weather forecast and make sure any works are applied and drying well before any frost is due.

At EWI Pro we do not recommend rendering in the rain, or even rendering if there is any rain forecast before the materials have completely dried. If any doubt, seek advice from our technical team.