The performance of windows to water intrusion is a function of air pressure difference on the inside and outside surfaces of the window. The pressure difference for which a window is tested for water intrusion is a function of its performance grade (permissible design wind load). What is the relationship between the performance grade of a window and the pressure difference for which it is tested
for water intrusion?
What will be an ideal response?
The pressure difference for water intrusion testing is 15% of a window's performance grade (PG). For example, a
PG30 window is tested for water intrusion with a pressure difference = 30(0.15) = 4.5 psf.
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