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From site checks to EWS1: how robust quality control protects recladding projects

Published on: February 9, 2026

High-rise recladding is technical, tightly regulated work. Even well-designed schemes can run into problems if installation quality is not carefully managed.

GSIM places quality control at the centre of every project, aligning our processes with EWS1 expectations and forensic defect analysis to deliver safe, compliant facades.

Why quality control matters in cladding remediation

Poor installation can undermine even the best materials and designs:

  • Missing or incorrectly placed cavity barriers

  • Inadequate fire stopping around openings and penetrations

  • Incorrect fixings or inadequate support rails

  • Incomplete air- and moisture-management detailing

These issues may not be visible once the facade is complete, which is why structured inspections and documentation are essential.

GSIM’s approach to quality control

Our quality control framework includes:

  • Pre-construction reviews – checking drawings, specifications and test data against current regulations.

  • Hold points and inspections – inspecting sub-frames, fixings, fire barriers and insulation before they are closed up.

  • Photographic records – capturing key stages of installation for future reference and EWS1 evidence.

  • Checklists and sign-offs – ensuring that work is inspected and approved by competent supervisors and, where appropriate, independent inspectors.

Forensic defect analysis and remedial strategy

On many projects, GSIM is asked to investigate existing facades that have already been installed but are showing defects or compliance concerns. Forensic defect analysis may involve:

  • Targeted opening up of facades

  • Testing of materials, fixings and fire stopping

  • Reviewing original design information and construction records

  • Proposing staged remedial works and monitoring outcomes

This evidence-based approach gives clients confidence that remediation addresses the real issues, not just surface symptoms.

Supporting EWS1 sign-off

EWS1 assessments rely on clear evidence that external wall systems meet safety requirements. By combining strong quality control, detailed records and collaboration with fire engineers and assessors, GSIM helps clients assemble the information necessary to support positive EWS1 outcomes.