A rain screen is a building technique designed to protect structures from water damage. It consists of an outer layer, often made of materials like wood, metal, or vinyl, that creates a barrier against rain. This outer layer allows water to drain away while also providing ventilation, which helps prevent moisture buildup behind the walls. The space between the rain screen and the building's structure is crucial. It allows air to circulate, drying out any moisture that may have entered. This design helps maintain the integrity of the building, reducing the risk of mold and rot, and extending the lifespan of the materials used in construction.