Understanding PAS2035 Non-Conformities
PAS2035:2021 sets the standard for energy retrofit of buildings. Despite rigorous planning and quality control, non-conformities—deviations from the standard's requirements—occur on most retrofit projects. Understanding what constitutes a non-conformity and how to manage it is essential for anyone involved in retrofit delivery.
A non-conformity occurs when work, materials, design decisions or processes fail to meet PAS2035 specifications. This might be a missing certification, incorrect installation sequencing, inadequate airtightness measures, or failure to follow the Retrofit Assessment Protocol (RAP). The key distinction is that non-conformities are not automatically failures; they require systematic evaluation and resolution.
Types of Non-Conformities
Major Non-Conformities
Major non-conformities significantly impact the retrofit's performance outcome or safety. Examples include:
- Installation of insulation materials without appropriate certifications
- Failure to complete mandatory airtightness testing
- Structural work performed without engineer sign-off
- Thermal bridging risks not addressed in design
- Failure to document the building's initial condition against the RAP
Minor Non-Conformities
Minor non-conformities have limited impact on overall performance but still require addressing:
- Missing or incomplete photographic records
- Delayed completion of on-site testing procedures
- Documentation submitted without required signatures
- Minor discrepancies in material specification records
The Identification and Reporting Process
Non-conformities are typically identified through several mechanisms. On-site supervision and quality inspections catch installation deviations early. Third-party commissioning visits often identify documentation gaps or procedural oversights. Sometimes clients or subsequent audits raise issues after practical completion.
When a non-conformity is identified, it must be formally recorded. This includes:
- Clear description of what deviates from PAS2035
- Location and scope of the issue
- Likely cause and impact assessment
- Photographic evidence where applicable
- Date identified and person identifying it
Transparency at this stage protects all parties and establishes a clear audit trail. Attempting to hide or minimise non-conformities creates far greater problems later.
Resolution and Corrective Action
Assessment and Root Cause Analysis
Not all non-conformities require the same response. A robust assessment determines severity and remediation pathway. Does the non-conformity affect the retrofit's thermal or air quality performance? Does it breach building regulations or safety standards? Can it be rectified on site, or does it require design revision?
Corrective Actions
Options for addressing non-conformities include:
- Remediation: Correcting the defect on site (re-installing material, completing missed testing, obtaining delayed certification)
- Design adjustment: Modifying the retrofit specification to accommodate what has occurred
- Performance compensation: Adding measures elsewhere to offset performance impact
- Documented acceptance: In rare cases, formally accepting the non-conformity with justified reasoning
Documentation Requirements
Each resolution must be documented comprehensively. This includes photographs of corrective work, revised test certificates, engineer sign-offs, and updated commissioning reports. The project file must clearly show the non-conformity, assessment, action taken, and final verification.
Impact on Project Certification
A project with non-conformities can still achieve PAS2035 certification, provided all issues are properly assessed and resolved. What matters is not whether problems occurred, but how they were managed. A retrofit with thoroughly documented non-conformity resolution demonstrates greater rigour than one claiming perfection without evidence.
However, unresolved or inadequately documented non-conformities prevent certification. Retrofit coordinators must not be pressured into signing off incomplete work or bypassing required procedures.
Prevention Through Process
Whilst non-conformities cannot be entirely eliminated, robust project management minimises them:
- Detailed pre-contract specifications and drawings
- Clear communication of PAS2035 requirements to all supply chain partners
- Regular on-site supervision and quality checks
- Documented toolbox talks addressing common issues
- Realistic project scheduling that doesn't compress critical stages
Key Takeaway
Non-conformities are manageable when approached systematically. The retrofit industry's maturity depends on treating them as learning opportunities, not crises. Transparency, thorough documentation, and proper resolution processes protect building quality, professional integrity, and ultimately, householder outcomes.