EWI guarantees, system certificates and installer schemes explained
The short answer
An EWI system's performance is certified by its system holder (the manufacturer), commonly through a BBA certificate or a European Technical Assessment. Installer schemes such as TrustMark and PAS 2030 apply mainly to funded work, and guarantees vary in who backs them and what they cover, so get every promise in writing.
System certificates
The system holder tests and certifies the whole build-up: adhesive, board, anchors, mesh, basecoat and finish. A BBA certificate or ETA sets which boards and finishes can be combined, fixing patterns, height limits and maintenance. Ask for the certificate number with your quote. We give it to you in writing.
Installer schemes
- TrustMark: a government-endorsed quality scheme, required for much funded work.
- PAS 2030 / PAS 2035: standards for installing energy-efficiency measures and for whole-house retrofit assessment and coordination, required by most funding schemes.
- INCA: the Insulated Render and Cladding Association, a trade body for system holders and installers.
- SWIGA: the Solid Wall Insulation Guarantee Agency, which has provided guarantees for some installations.
Membership of these bodies belongs to individual businesses. Check any claim directly with the scheme.
Guarantees: what to check
Ask who provides the guarantee (installer, system holder or a third party), how long it lasts, what it covers (materials, workmanship or both), what maintenance it requires, and what happens if the installer stops trading.
Related services
Questions people ask
Do you hold TrustMark or PAS 2030?
We don't claim scheme memberships on this site. If your project needs a specific certification, for example for funding, ask us and we will confirm the position in writing before you book.
What is a BBA certificate?
An independent assessment of a construction product or system by the British Board of Agrément, including its intended use and limits.