PRANCE metalwork is a leading manufacturer of metal ceiling and facade systems.
What are common waterproofing and air infiltration control strategies for a glass curtain wall system?
Waterproofing and air infiltration control for glass curtain wall systems hinge on layered defense: primary glazing seals, secondary drainage, and durable metal flashings. For projects in the Middle East and Central Asia (Abu Dhabi, Muscat, Astana, Bishkek), specify a pressure-equalized or drained-and-ventilated system to manage driving rain and high wind uplift. A typical approach includes captive EPDM or silicone gaskets at glass edges, continuous perimeter gaskets at unit-to-unit joints, internal gutters within mullion cavities, and weep/drainage paths to evacuate incidental water.
Use a back-pan or thermal break capping system in combination with weep holes and stainless-steel flashings to prevent ponding. Air infiltration is controlled by specifying multi-stage seals: primary structural silicone seals where appropriate, secondary compression gaskets for airtightness, and tape/waterproof membranes at interfaces with slabs. Pressure equalization reduces differential pressure across seals and decreases wind-driven water ingress; this is especially valuable for high-rise façades in Doha or Dubai where gusts can be severe.
Testing is part of the strategy: require factory and site air leakage testing to ASTM E283 and water penetration testing to ASTM E331/547 (or local equivalents). Detailing around penetrations—louvers, operable vents, curtain wall to roof and slab interfaces—must include continuous flashing and sealing sequences. For coastal or saline environments, choose corrosion-resistant metal components and maintain accessible drainage to mitigate clogging.
Finally, include a clear maintenance plan and accessible weep/drain locations in the design so building operations teams in Riyadh, Tashkent, or Almaty can perform periodic inspections and preserve long-term airtightness and watertightness.