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Case Study – Silicone Render and Exposed Heritage Features

At EWI Pro, we specify many projects throughout the UK. They vary in size, scope, and system application. From large-scale commercial projects to small-scale residential, we cover every type of project. As we’ve discussed recently, we provide a comprehensive range of testing processes. These include wind-load tests, moisture testing, and pull-out tests. Our Technical Team also provides expert U-value calculations to ensure the system is suitable. In our new series of blogs, we will shine a light on specific projects and the build-ups they utilise.

External wall insulation and render have the benefit of being able to integrate with existing design features. This particular project in Newbury seamlessly blends a smooth silicone render finish to complement the exposed heritage features like brick and timber. The bottom half of the home is retained in a brick finish and several features remain with exposed timber. The colour choice adds a strong heritage aesthetic to exposed features. The dark wood is particularly striking and contrasts exceptionally well.

Project details

– Substrate: Brickwork
U-Value change: 2.2W/(m2K) – 0.3W/(m2K)
– Basecoat: EWI-225 Premium Basecoat
– Finish: EWI-075 Silicone Render
– Colour: 20001 Pure White
– Location: Newbury
– Installer: First Renderers

The build-up

The build-up of this project champions our best products. EWI-225 Premium Basecoat is a dual-purpose product that promotes strength, flexibility, and breathability in any system. As it is dual-purpose, it actively reduces wastage on site. EWI-075 Silicone Render complements the choice of basecoat as it has the same flexural and breathable qualities. Therefore, any moisture that may be trapped in the porous brick substrate can evaporate through the render system. The system is supplemented by a layer of fibreglass mesh which is embedded in the basecoat layer.

The major discussion point behind this project was the choice of colour. The dark wood and lighter wood features, combined with the roof colour and the traditional red bricks required a bright contrast. However, the colour of the render also needed to be creamier to assimilate with a heritage outlook, mimicking lime renders.

Silicone Render and heritage features

Silicone render is highly water-repellent. It allows for water vapour to escape from the building while preventing rain and moisture from penetrating the walls. This property is particularly useful for older homes which might have issues with dampness.

Older homes often have minor movements due to their age and the materials used in their construction. Silicone render is flexible, which means it can accommodate such movements without cracking. This is vital for preserving the structural integrity and appearance of heritage features.

One of the essential requirements for older buildings, especially those with solid walls, is to maintain breathability. Silicone render is permeable, allowing the walls to breathe, thus reducing the risk of trapped moisture which can lead to mould growth and structural damage.

Silicone renders are known for their long-lasting finish. They resist the growth of algae and mould, ensuring that the façade remains clean and attractive for longer. This is especially beneficial for older homes where frequent maintenance might not be feasible.

Silicone render can be tinted to match a wide range of colours, allowing homeowners to choose a shade that complements the heritage features of their property. This ensures that the historical aesthetics of the building are preserved.

When combined with an appropriate insulation system, silicone render can significantly improve the thermal efficiency of an older home. This can lead to reduced energy bills, making the home more comfortable and environmentally friendly.

Traditional homes often use materials that might not be compatible with modern renders. Silicone render, however, is often compatible with a broader range of substrates, ensuring a better bond and reduced risk of delamination.

Once applied, silicone render requires minimal maintenance. It does not need regular painting or treatment, making it a cost-effective solution in the long run.

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