Complete specifications for HVHZ-compliant clerestory windows. Higher elevations mean higher wind pressures - understand the requirements for these architectural features.
Side-by-side specifications for HVHZ clerestory window configurations.
Maximum daylight
Daylight + ventilation
Architectural statement
Wind pressure increases with height. Clerestory windows at 30+ feet elevation can require 20-40% higher design pressures than windows at grade. The velocity pressure coefficient (Kz) increases with height per ASCE 7, requiring stronger frames and thicker glass.
Yes, but with limitations. Operable clerestory windows in HVHZ typically achieve lower design pressures than fixed units. Awning-style operators are most common, with motorized options for heights over 10 feet. All hardware must be NOA approved.
Commercial-grade aluminum framing with thermal breaks is standard. Steel frames may be required for very high design pressures or large spans. Structural mullions connect to the roof structure and must be engineered for both wind and dead loads.
Access planning is critical. Options include permanent catwalks, roof anchors for rope access, or interior scaffolding during maintenance. Impact glass reduces cleaning frequency. Consider motorized operators for units over 12 feet high.
PE-stamped wind load calculations accounting for elevation and exposure factors.
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