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Section view of back ventilated cladding that allows water to leak out of drainage cavity.

figure 13

figure 13

Plan view of rear sealed vertical joints.

allowing air to enter and ventilate the cavity. Proper design of the horizontal joint and the air barrier in a pressure equalized rainscreen provides what Lstiburek indicates is excellent performance, that being horizontal joints that keep water out, while permitting air to enter and help dry the cavity. The vertical joints in this system are continuously rear sealed, creating closed vertical compartments in the metal cladding that help maintain pressure equalization (Figure 13). This is critical for highwind areas and at the corners of buildings.


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