How are quality control and factory testing conducted for a unitized curtain wall?

Quality control (QC) and factory testing for unitized curtain walls follow a documented production control plan comprising incoming material verification, dimensional inspection, assembly checks, and performance testing. QC begins with material certification and traceability—aluminum profiles, glass batches, thermal-break components, and sealants are verified against specification. Dimensional jigs, CNC machining, and coordinate measurement ensure profile tolerances and hole locations meet shop drawings. During assembly, operators perform in-line checks: gasketing compression, sealant bead continuity, glazing bite and setting block positioning, and fastener torque. Factory testing often includes water spray and air infiltration tests on sample units or mock-ups, as well as simulated wind load tests if a test frame is available. Leak testing under positive and negative pressures and thermal cycling can be employed to validate sealant and gasket performance. Non-destructive checks—such as infrared inspection for thermal continuity or ultrasonic inspection for adhesive bonding quality—are used when appropriate. Final acceptance requires documented inspection reports, photographs, serialized panel labeling, and packing lists. Third-party QA audits and witness testing by project representatives or certifying bodies are common for critical projects. Pre-shipment verification checks ensure packaging prevents distortion in transit; panels are crated and braced to preserve geometry. Robust factory QC minimizes field rejects and supports warranty claims.