Why is vertical as well as horizontal ventilation such a good idea?
Cross ventilation is necessary to allow each cavity to breathe as a system and to promote adequate drying across the span of the building envelope. Vertical ventilating allows for the area of the strip in contact with the moisture barrier (house wrap) to properly dry. In warmer summer conditions, when claddings undergo solar gain, the ventilation of the air space provided by Drain-Plane can provide a “cooling effect” as it provides a thermal type break between the cladding and the envelope.
