Stick and unitized curtain walls use many of the same facade principles, but they are assembled in different places and sequences. That distinction affects design flexibility, logistics, programme, quality control, and how the facade accommodates movement.
Stick construction
Vertical mullions and horizontal transoms are installed piece by piece on site before glass and panels are fitted. The method offers flexibility for low- and mid-rise buildings, irregular geometry, smaller quantities, and projects with straightforward external access.
Unitized construction
Large story-height panels are glazed and sealed in a controlled factory, then transported and hung from the building. Split mullions and interlocking seals allow panels to accommodate floor-to-floor movement while accelerating enclosure of repetitive elevations.
Selecting the method
Consider building height, repetition, crane and transport limits, site storage, weather, access, schedule, tolerances, and local manufacturing capability. The most efficient system is the one aligned with the entire delivery strategy, not only the elevation drawing.
