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External Wall Insulation (EWI) Explained
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Adding insulation to the outside of a wall, and when it’s the right choice.
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External wall insulation wraps a building in a continuous insulation layer, improving thermal performance while preserving internal space and reducing cold bridging at junctions. This guide covers the layers involved, suitable wall types, render and finish options, and the key installation details — including movement joints and window reveals — that determine long-term performance.
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