A condition that cannot be safely or effectively restored in place or lies outside GlassRenu's approved restoration scope.
GlassRenu · Educational illustration
Meaning and boundaries
Category 5 is not merely a deeper Category 4. It is controlled by repairability, access, construction, integrity, coating, or safety limits.
Why it matters in glass restoration
This category creates a clear stop-work and referral outcome for replacement, manufacturer service, engineering review, or another qualified specialist.
Related terms
References
- National Institute of Standards and Technology — Fractography of Ceramics and Glasses, 3rd edition
Publisher’s original source - National Glass Association — Construction Site Protection and Maintenance of Architectural Glass
Publisher’s original source - GlassRenu — Visual Inspection Standards for Architectural Glass Damage Assessment and Restoration (VIS-A / VIS-DA)
Publisher’s original source