External Wall Insulation (EWI)
Much of the UK's housing stock built between 1939–1970 was constructed primarily for speed and economy and not with thermal efficiency in mind. Although many of these buildings remain structurally sound, they continue to be extremely poor at retaining warmth, which impacts on residents’comfort levels, energy usage, and costs.
EWI is designed to improve the thermal performance of buildings by the application of an insulating layer and a decorative weatherproof finish applied to the external wall surfaces of a building.
It is ideal for non-traditional construction types where in addition to obvious thermal benefits it can protect the fabric and provide structural and aesthetic improvements. As well as improving comfort levels cold bridging, dampness and condensation are eliminated.
When structural solutions are required then Anglian offer the unique Structherm insulated cladding system, this provides a rigid structurally continuous envelope around the building with a render finish. The site survey data is used to manufacture steel reinforcement panels to suit each individual property. This reinforcement cages form the backbone of the system.
Insulated render systems are based on a number of layers, the main layers being:
1. Insulant
2. 
Reinforcing mesh
3. Basecoat render
4. Surface finish
We offer a comprehensive range of insulation types including:
1. Mineral Wool (MW)
2. Expanded Polystyrene (EPS)
3. Phenolic (PIR)
Each has its own benefits and the suitability is identified based on the technical and thermal requirements of each house. The insulants are CFC and HFC free and are available in thicknesses between 30mm and 200mm, they are fixed with a combination of mechanical fixings and adhesive depending upon insulation type and structure.
The reinforcing mesh is available in the following materials:
1. Polypropylene
2. Galvanised steel
3. Stainless steel
A wide range of finishes are available, most are render based including acrylic, silicone and numerous aggregate dash options and cost effective two coat brick effect systems. The brick effect systems can be used for full area coverage or for the creation of brick features such as string courses or quoins.
Render finishes vary in thickness typically between 3mm and 24mm, movement joints are incorporated on refurbishment projects, when required.
The finish is selected primarily based on the desired aesthetic whilst also considering the level of impact resistance required.
Anglian have carefully selected some of the best external wall insulation systems all of which are British Board of Agrement approved. We are Approved Installation Contractors for a number of systems including PermaRock, Structherm and Rockwool.
Find out more
To find out more about how we can help insulate your hard to treat non-traditional construction properties please contact john.fairweather@angliangroup.com or stephen.preece@angliangroup.com.
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