Exterior Cladding

Principles of Rain screen Facades
A rainscreen façade – often called a ventilated façade – does
not try to seal the exterior of a building with a physical barrier
to water. This is unlike many other façade systems, which
depend on weather-barrier walls created using fitted joints
and liberal applications of caulk. Such barrier-wall systems
require significant effort to construct and maintain.
Instead, rainscreen façades mount a semi-open screen some
distance from a building that allows a little water in, but only
as far as the back surface of the screen. Between this outer
layer and the inner building shell sits an envelope of air.
The open joints of ventilated/rainscreen façades allow air to
flow freely into and out of this envelope area. The unrestricted
air movement produces three very useful benefits:
• First, the flow eliminates pressure differences that would
tend to blow water further in. This means little if any water
makes it across the air gap to reach the inner shell.
• Second, the air flow dries any moisture within the envelope
area, such as rain that might be trickling down the back
of the outer shield.
• Third, the air envelope acts as an insulating barrier by
minimizing thermal bridges and preventing heat buildup
within the envelope.
The result is a more sustainable, functional

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