Pressure-equalized rainscreen
Posted: Thu Jul 10, 2025 7:16 am
Drained/back-ventilated (D/BV)
The most common type of drained and back-ventilated rainscreens allow water to enter the cavity in limited amounts, and the WRB prevents it from entering the building or substructure.
The cavity is vented to allow for the water to evaporate. The system must be able to vent and dry out any moisture that has entered the cavity.
(PER)
This type of rainscreen prevents all rainwater penetration, while air is deliberately whatsapp number database forced to penetrate the wall cavity in order to equalize pressure on the exterior and interior of the outer wall.
In the PER system, static and dynamic air pressures are theoretically in equilibrium. That is, pressure measured on the exterior of the rainscreen is equal to the air cavity between the rainscreen and the substrate. Pressure equalization is important to prevent physical forces causing water to penetrate the building structure. The key to an effective and efficient PER lies in the ability to control the airflow within and through the wall assembly.
The most common type of drained and back-ventilated rainscreens allow water to enter the cavity in limited amounts, and the WRB prevents it from entering the building or substructure.
The cavity is vented to allow for the water to evaporate. The system must be able to vent and dry out any moisture that has entered the cavity.
(PER)
This type of rainscreen prevents all rainwater penetration, while air is deliberately whatsapp number database forced to penetrate the wall cavity in order to equalize pressure on the exterior and interior of the outer wall.
In the PER system, static and dynamic air pressures are theoretically in equilibrium. That is, pressure measured on the exterior of the rainscreen is equal to the air cavity between the rainscreen and the substrate. Pressure equalization is important to prevent physical forces causing water to penetrate the building structure. The key to an effective and efficient PER lies in the ability to control the airflow within and through the wall assembly.