External wall Insulation (EWI) Systems in Kent & Sussex
External Wall Insulation (EWI) is a high‑performance insulation system applied to the outside of a property, then finished with a silicone render topcoat. It is one of the most effective ways to improve energy efficiency and transform the appearance of a home.
What EWI Is
EWI involves fixing insulation boards (EPS, mineral wool, or phenolic) to the external walls, then applying a reinforced basecoat and a silicone render finish.
Key Features
Significantly improves thermal performance
Reduces heat loss and energy bills
Eliminates cold bridging
Improves internal comfort
Transforms the exterior appearance
Adds value to the property
Ideal for older homes without cavity walls
Insulation Types
EPS (Expanded Polystyrene) — cost‑effective, excellent insulation
Mineral Wool — breathable, fire‑resistant, ideal for older buildings
Phenolic Boards — highest thermal performance
Suitable Applications
Solid‑wall homes
Older properties
Homes with poor insulation
Refurbishments
Energy‑efficiency upgrades
Properties undergoing external transformation
Installation Overview
Fixing insulation boards
Mechanical and adhesive fixing
Reinforced basecoat with mesh
Primer
Silicone render finish
Lifespan
EWI systems typically last 25+ years, depending on the insulation type and render finish.
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