What installation tolerances and sequencing should project managers enforce for glass curtain wall erection?

Glass curtain wall installation demands strict tolerances to maintain alignment, waterproofing, and structural performance. Mullions must be plumb within millimeter-level accuracy, and anchor brackets require precise torque values to prevent stress concentration. Sequencing typically proceeds from bottom to top, allowing alignment adjustments and consistent load transfer. Pre-installation mock-ups help validate tolerances and detect potential issues early. Glazing insertion must follow sealant curing times and gasket compression requirements. Tolerances for verticality, horizontal level, joint uniformity, and glass edge spacing are all defined by manufacturer specifications and standards such as CWCT or AAMA. Poor installation can cause water leakage, excessive deflection, or glass breakage. Project managers enforce daily QC inspections, safe lifting procedures, and proper protection of façade surfaces. Coordination with other trades—especially concrete works, MEP penetrations, and roofing—is critical to avoid conflicts. Strong sequencing ensures efficient installation, minimized rework, and long-term façade reliability.