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What makes a good external wall insulation installer?

Because external wall insulation is a fairly new concept for many people, customers are often worried about choosing the right installers and achieving a high quality of workmanship, because EWI isn’t a one size fits all situation – it needs to be tailored to the property.

Generally, we advise that customers go through us to find installers. This is because all of the installers that we recommend are trained by us in how to use our products, correctly following our system specification. By choosing to use an EWI Pro approved installer, you can guarantee a high quality finish.

However, it’s always good to pay an interest and be conscious of how things should be done. So we’ve put together this brief guide on what you should expect from a good external wall insulation installer.

A good EWI installer will carry out a property assessment

Before beginning any installation, a professional external wall insulation installer will make a detailed assessment of various important factors that need to be considered before going ahead with the installation.

Generally, a good installer will make an assessment of:

  • The building conditions and elements, ensuring walls, floors, roofs, windows etc are free from damp and mould growth with problems solved prior to installation.
  • The original building materials to determine the appropriate EWI materials to be used (e.g. breathable and non breathable materials).
  • Location and climatic conditions, i.e. exposure to wind driven rain/pollution and subsequently the appropriate materials to be used.
  • Ventilation, with careful consideration of its efficiency and functionality post-installation.
  • Moisture content of substrate and subsequent appropriate choice of materials/resolution of excess moisture.
  • Condition of wall surface (installation of parge coat as necessary).

A good EWI installer will ensure a high quality of workmanship

A good EWI installer will ensure that the following is carried out and completed correctly to a high quality of standard:

  • Use of the correct primer on the substrate to limit its absorptivity and increase adhesion.
  • Fully embedded mesh.
  • Tightly fitted insulation boards, no gaps and proper following of bond pattern.
  • Proper installation of fixings – appropriate method of drilling and sinking.
  • Air vents and drains left clear.
  • Sills and verge trim appropriately sealed.
  • Starter track is installed straight and level.
  • Window sills are level.
  • Application of materials to clean, dry surfaces.
  • Insulation continuity between walls and loft
  • Insulated window sills.
  • Specification of brick slips or highly durable finishes for areas with high traffic.
  • Correct installation of render finish and specification of appropriate system depending upon the climate conditions and property type.
  • Correct insulation around eaves and porch roofs.
  • Fittings and fixtures should be designed to be deconstructed so as to prevent collateral damage when replacing or removing.
  • Correct use of required beading.
  • Awareness of the effect of different materials on cold bridging i.e. metal.
  • Use of EPS caps on metal mechanical fixings.

A good EWI installer will ensure proper usage of materials

During our installer training (sessions run every thursday) we introduce our products, the different EWI systems we have on offer and how to correctly and safely install them. As a result, an approved installer will be able to ensure optimal performance of our products. The following are a few ideas for how an installer should correctly use our materials:

  • Renders, insulation, and adhesives should be stored appropriately away from detrimental weather conditions such as high heat, cold temperatures and rain.
  • Insulation boards must be dry before application. Insulation boards should not be installed when wet from rain water.
  • Insulation must be in its proper condition (i.e. undamaged) upon installation. Damaged insulation can cause pockets of moisture.
  • Installer should follow manufacturers guidance for best practice. All approved installers have been trained in the correct use of our materials, and customers are at all times at the benefit of our technical expertise and advice when needed.

For any further questions, feel free to leave a comment down below or give us a call. We upload a new blog every Tuesday and Thursday, so stay tuned for more content about technical advice and product information!


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