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EXTERNAL ENVELOPE
The same products can also be used to reproduce features such as soldier courses, quoins and decorative bonding patterns.
Community support System suppliers can also support meaningful community engagement. For schemes that involve large numbers of separate homes, suppliers should be willing to attend pre-commencement community events. Here, they can provide residents with samples and visualisations, information about the energy savings likely to result from retrofi t works, and answers to relevant questions about the installation process itself. This all helps to encourage community buy-in, especially if residents can also be given a say in the fi nal choice of colours and fi nishes. In turn, the willing support of local householders can help to minimise no access issues and associated delivery delays.
System design Ben Harrison Photography
When involved at an early stage, an external wall insulation specialist can also bring valuable experience that may inform the overall architectural design. This may be true of virtually any building, but it’s especially relevant to retrofi t schemes that involve non-traditional properties. Through past experience of working on unusual, solid walled or non-traditional archetypes, a system supplier may be aware of cold bridging risks at particular interfaces. Previous pull out tests and inspections might also have identifi ed other substrate specifi c risks. These risks can then be taken into account as part of the initial design phase rather than having to be addressed through subsequent onsite adaptations. That, in turn, can produce savings on time, labour and materials, and give the whole stakeholder team more certainty on scheduling and project costs. Similarly, the system provider’s experience can help the wider team to adopt best practice design and installation techniques from the outset. This promotes a ‘right fi rst time’ approach, and helps all parties to avoid the additional costs and delays associated with learning lessons along the way.
Aesthetics Ben Harrison Photography
By providing access to the right products and expertise, a good EWI supplier should be able to help specifi ers devise plans that yield longer-term savings on
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System suppliers can provide condensation risk analyses or U-value calcs
routine maintenance. Depending on their location and orientation, building facades will routinely be exposed to wind blown dirt, microorganisms and atmospheric pollution – factors that can potentially lead to discolouration or unsightly growths. However, many modern fi nishes offer features that help to preserve a brighter, cleaner appearance – for example, a tendency to shed dirt through the effects of ordinary weathering, and special preservatives that inhibit organic growth.
Quality & reporting
Pre-commencement collaboration with a system supplier can enable specifi ers to propose products, methods and delivery arrangements that support improved quality assurance. For example, the supplier’s technical team can produce system designs and standard detailing that can be referred to in early meetings with clients, installers, site managers and others. These can form part of method statements, risk analyses, and site specifi c training for installers. Reputable suppliers should always be willing to provide such support to assist specifi ers and clients in fi nalising their designs. Similarly, early engagement with the system designer and other stakeholders affords more time to defi ne KPIs and to agree on channels for reporting the results of routine quality inspections. Given suffi cient time to prepare, suppliers may be able to produce certain complex elements of an EWI system offsite, in controlled factory conditions. These pre-cut components can then be supplied to the installer as a means of speeding progress and ensuring proper treatment of challenging interfaces. For EWI systems, such interfaces might include door and window reveals, vents and pipework, and – where required – roofl ine closure systems. Whether the scheme is looking to meet or exceed the demands of Building Regulations, PAS 2030/2035 standards or other performance requirements, early dialogue with an experienced system supplier should be considered essential.
Richard Tocher is sales & technical director at Permarock
ADF JANUARY 2026
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