Episode 11 – Rainscreens


Today we will be talking about Rainscreens and specifically the difference between Drained and Back-Ventilated Rainscreens and Pressure-Equalized Rainscreens.

As a refresher a Rainscreen is the first line of defense against the elements.

A rainscreen system is an exterior wall detail where the cladding stands off from the water barrier applied to the sheathing to create a capillary break and to allow drainage and evaporation.

There are two types of rainscreens, first is the Drained and Back-Ventilated rainscreens (D/BV) and secondly is the Pressure-Equalized Rainscreens (PERS).

The biggest difference between the two is that Drained and Back-Ventilated rainscreens are traditionally an open joint system that allow you to see between the panels and see the cavity of the wall system. Exposing insulation and the Air-Vapor-Barrier to the elements and harmful UV rays.

A Pressure-Equalized Rainscreen has a closed joint via infill strips that act as air dams in both vertical and horizontal joints.

The air pressure equalizes and keeps rain and snow from getting driven into the wall cavity – This significantly reduces the amount of moisture that goes into our system. Our systems have passed the AAMA 508-07 test for pressure equalization.

If you have any questions regarding rainscreens and wish to speak to one of our experts please contact us at info@elemex.com