How does a rain screen help prevent damage to a building?

A rain screen is an important component in building design that provides an effective means of managing moisture. By creating an air gap between the outer cladding and the building's structural wall, it allows any water that may penetrate through the cladding to drain away effectively. This drainage system, paired with the ventilation aspect of the air gap, helps to prevent water from accumulating against the building materials, which could lead to mold growth, water damage, or degradation of the structure.

The air gap also facilitates airflow that assists in drying out any moisture that may have entered, further protecting the building's integrity over time. Therefore, the configuration of a rain screen is critical for ensuring a building remains dry and resistant to the elements, as it does not entirely seal off the building from rain but instead manages how moisture interacts with the structure.