Quality Assurance Tool
EWI System Component Checklist
The 7 Critical Layers That Make or Break Your Installation
Use this interactive checklist to verify that your External Wall Insulation contractor is following best practices. Print it, take it on-site, and don't sign off until every box is ticked.
NSAI Standards
Homeowner Inspection Guide
Contractor Verified
The 6 Essential Components at a Glance
Each layer serves a critical purpose in your EWI system
Installation Quality Score0/22 Checks Complete
The aluminium or uPVC rail installed at the DPC (Damp Proof Course) level.
Red Flags to Watch For
- Contractor refuses to show you the materials before installation
- Mixing components from different manufacturers to "save costs"
- Skipping mechanical fixings ("the glue is strong enough")
- No mesh overlap or stress patches at corners
- Applying render in bad weather conditions
This checklist is based on NSAI Agrément certification standards and European Technical Assessment Guidelines (ETAG 004). For professional installations, always verify your contractor is NSAI registered for SEAI grant eligibility.