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A rainscreen is an exterior wall detail where the siding (or other cladding) stands off from the surface of the water-resistive barrier (WRB) in order to create a capillary break and allow drainage and drying. Water that penetrates the cladding is allowed to drain freely and diverted out of the wall. With a rainscreen, an air space is created which promotes drying behind the cladding.

A rainscreen wall design will include:

  • A water-resistive barrier
  • An air space between the WRB and the back of the cladding
  • Flashings at all penetrations and vulnerable areas
  • Places, like weep holes, for water to exit the wall system
  • Ventilation openings, top and midpoints of the wall (sometimes)

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