DESIGN/RAIN PENETRATION
A two-stage joint can be designed as a pressure-equalized rain screen joint to further improve
performance, as shown in Figure 3.4.9 (PCI). In this approach, vents are purposely provided in the
rain seal to achieve pressure equalization in a chamber between the rain and air seals. The joints
are sloped downward to control gravity driven leakage and are wide enough to control capillary
action. The joints are also equipped with baffles to control water leakage from kinetic energy.
Section of Horizontal Joint
Plan of Vertical Joint
Plan of Vertical Joint
Section of Horizontal Joint
Figure 3.4.9 Precast Concrete Panel -
Two-Stage Pressure Equalized Joints (PCI)
PAGE 3.4-9
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