PRANCE metalwork is a leading manufacturer of metal ceiling and facade systems.
What fabrication tolerances and quality control measures are standard for precision glass curtain wall system production?
Precision in fabrication is central to curtain wall performance. Typical tolerances for unitized panels and extruded aluminum components are tight: panel overall dimensions often require ±2 mm tolerance, mullion squareness within ±1–2 mm over specified lengths, and glazing bite control within ±1 mm. CNC machining and jigged assembly in the factory are standard practices to achieve repeatability.
Quality control measures begin with incoming material verification (aluminum temper, glass thickness, coating certificates) and continue through production with dimensional inspections, torque-controlled fastener checks, and sealant bead profile verification. Implement process control charts and hold points for critical stages: thermal break insertion, glazing setting, and final weatherseal application.
Factory testing includes mock-up performance testing for air, water, and structural loads, and inspection of coating adhesion and surface finish per AAMA or equivalent standards. Maintain traceability for every panel: serial numbers, production date, and QC checklist. For complex geometries, computerized measurement systems (laser trackers) verify as-built against CAD models.
Require ISO 9001 or equivalent QA systems for suppliers and document all non-conformances with corrective action plans. For projects in Dubai, Riyadh, or Almaty, choose fabricators with proven experience in high-rise façades and a documented record of successful mock-up testing and site performance to reduce acceptance risk.