Frequently Asked Questions
What is the purpose of External Wall Insulation?
EWI is designed to improve a building’s thermal performance, reduce energy bills, and protect the property from moisture, cracks, and weather damage.
How does EWI work?
A layer of insulation material is attached to the outside walls, then sealed with a protective render, creating a thermal barrier that prevents heat from escaping.
What materials are used for EWI?
Common materials include expanded polystyrene (EPS), mineral wool, and phenolic boards, each offering different levels of insulation and fire resistance.
Is External Wall Insulation suitable for all homes?
EWI is best suited for solid wall properties without cavity walls. It’s ideal for older homes and those with poor insulation.
Will EWI change the appearance of my home?
Yes, but in a positive way — the render finish can be chosen in various colours and textures to enhance your property’s curb appeal.
What is Silicone Render?
Silicone Render is the finishing element — the final coat of a thin coat render or External Wall Insulation (EWI) system. As the last protective layer, it is textured and tinted to any colour, offering an almost endless combination of finishes to suit any property style. Silicone render is highly water-repellent, breathable, UV-resistant, and flexible, making it one of the most durable and low-maintenance render options for external walls.
Why use silicone render in External Wall Insulation?
Silicone render protects the insulation from weather damage, prevents water penetration, and maintains the building’s breathability, reducing the risk of damp and mould.
Is silicone render waterproof?
Yes — it is highly water-repellent, meaning rainwater runs off the surface, but it still allows water vapour from inside the walls to escape.
Does silicone render crack over time?
Unlike traditional cement render, silicone render is flexible and less likely to crack due to building movement or temperature changes.
Can silicone render be painted?
It’s available pre-tinted in hundreds of colours, so painting is usually unnecessary. However, it can be painted later if desired.
Is silicone render expensive?
It’s generally more expensive than standard render types, but its durability, low maintenance, and weather resistance often make it more cost-effective in the long run.