DESIGN/RAIN PENETRATION
The pressure-equalized rain screen approach can also be applied to whole wall systems by
incorporating a cavity behind the facade, as shown in Figure 3.4.10. The panel joints are opened to
pressurize the cavity and are sloped downward to control gravity-driven rain penetration. The cavity
is equipped with flashing at appropriate locations to provide drainage. An air barrier is installed
behind the insulation, with the air-tightness of this element being critical to the performance of the
system.
Air and vapor
Pressure
ir seals between wall air
barrier and floor slab
Figure 3.4.10 Precast Concrete Panel -
Pressure Equalized Rain Screen (Rousseau)
PAGE 3.4-10
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