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Why Externally Insulate?

  • A decent home is windproof, weathertight and warm, with modern facilities
  • The Government expects all homes to meet this standard by 2010
  • Increases thermal quality of the building
  • Particularly relevant when refurbishing non-traditional housing
  • Overcomes moisture/condensation issues
  • Protects the existing building envelope
  • Reduces heating bills by 25%
  • Improves the building’s appearance


  • Properties need to be fully surveyed
  • Is substrate suitable for mechanical fix?
  • Is there sufficient overhang on cills/soffits?
  • Gates/satellite dishes, a provision needs to be made for refix
  • Are windows and reveals suitable?
  • Do soil pipes need to be moved?


4 key stages for a typical semi
1) Scaffolding when required.
2) Boarding and beading 1-2 days
3) Base coat and Mesh 2 days
4) Top coat /finish 1days
Drying times required for stage 2 up to 48hrs
Can only be applied if temp is 5 degrees and rising


As building standards improve, the thermal quality of new builds also improves. The thermal quality and performance of a given construction is expressed by its U-value.

The closer a U-value is to zero the better. A low U-Value suggests that heating the home should be easier, cheaper and that heat will not escape so easily. The same values are used to measure the insulating properties of floor and loft insulation, glazing and doors. In Scotland at present, for retrofit EWI the target U-Value is 0.3.

The exact U-Value for your property will be determined by considering the combination of the wall construction and the thickness and quality of the insulation board. The thickness of the board will often be determined by the quality of the insulation. There are three common types:

Expanded Polystyrene (EPS)
Mineral Wool
Polyisocyanurate (PIR)
Generally speaking, the PIR boards offer a greater quality of insulation therefore the boards will not need to be as thick as an EPS system for example though it is more expensive as a result.

What is External Wall Insulation?

A method of upgrading the thermal performance and external appearance of existing properties
Insulated and rendered properties are transformed into warm, energy efficient and attractive homes/buildings.