External Wall Insulation (EWI), also known as External Thermal Insulation Composite Systems (ETICS) or External Insulation and Finish Systems (EIFS), is a method of insulating and weatherproofing the exterior walls of buildings.

In EWI, an insulating material is fixed to the external walls of a building, typically using adhesive or mechanical fixings. This insulation layer helps to improve the thermal performance of the building by reducing heat loss through the walls, thus enhancing energy efficiency and reducing heating costs.

After the insulation is installed, a protective render or cladding system is applied over the insulation to provide weatherproofing and aesthetic enhancement. The render system can be customized with various finishes, colors, and textures to suit the design preferences of the building owner or specifier.

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