How external wall insulation works
External wall insulation adds a continuous layer of suitable insulation to the outside of a building and protects it with a specified reinforced render system or compatible cladding.
Reducing heat transfer through suitable external walls can improve the thermal performance of a property. Actual energy savings depend on the existing building, insulation design, heating use and quality of installation.
Choosing the right system
Expanded polystyrene, mineral wool and other insulation materials differ in their properties and applications. The board, adhesive, fixings, mesh, basecoat and decorative finish form one specified system.
Wall construction, exposure, fire safety requirements, moisture risks and access affect the design. Reveals, roof overhangs, gutters and the plinth must be reviewed before installation begins.
Preparing for a quotation
Provide photographs, approximate elevation areas, wall construction and any relevant drawings or energy-efficiency objectives. A survey will establish substrate condition and details such as services, openings and existing coatings.
A written quotation should state the proposed system and inclusions, including scaffold and preparation where relevant. VAT is assessed against the current rules for the specific installation rather than assumed from the product name.
Every property is different. Render, plastering and insulation specifications must be chosen to suit the building and the manufacturer's installation guidance. For a quotation, send the property location, approximate dimensions and photographs.
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