In glass distribution, even small technical spec errors can ripple into massive project consequences. The margin for error is razor-thin, and one misinterpreted drawing or unchecked assumption can unravel months of planning.
The Breakdown: Incorrect Edge Clearance for Curtain Wall Glazing
A distributor provided IGUs for a high-rise curtain wall. The project specified tight edge clearances due to structural constraints. However, the drawings used for fabrication were outdated by one revision. The updated specs had reduced the allowable tolerance due to thermal movement requirements.
After installation began, several units showed compression cracks. Upon review, it became clear that the edge clearance was insufficient, putting stress on the glass under expansion.
Root Cause Analysis
Outdated shop drawings circulated to the fabrication team.
No formal drawing freeze or spec lock prior to production.
Change orders not linked to BOM or part generation system.
Impacts
Over 30 IGUs had to be replaced at the distributor’s cost.
The curtain wall contractor held up final payments.
Legal review initiated to determine responsibility across partners.
Permanent Solutions
Introduced a spec lock workflow tied to change management cutoffs.
Automated version control on drawings distributed internally and externally.
Created a spec traceability report that flags any dimensional change affecting BOM.
Spec errors aren’t just technical—they’re systemic. Glass distributors who control versioning and traceability drastically reduce field errors and liability.
