What is a curtain wall system?1

A curtain wall system comprises aluminum framing members (mullions and transoms), insulated glass units or panels, gaskets, pressure plates, sealants, and anchorage hardware. Together, these components create a continuous envelope that resists air, water, and wind loads without supporting structural weight. Systems are engineered to accommodate building movements, thermal expansion, and deflection. They may be fabricated stick-by-stick on site or as factory-assembled unitized modules. Performance criteria include thermal insulation (U-values), air infiltration rates, water penetration resistance, and structural integrity under wind pressure. A well-designed system delivers energy efficiency, occupant comfort, and the architectural vision of a transparent, luminous façade.