Red Seal Glazier Practice Exam

The function of a rain screen in a curtain wall system is primarily to protect the building envelope from water infiltration. A rain screen acts as a barrier that prevents moisture from penetrating into the interior of the building while still allowing for drainage and ventilation. By creating a gap between the outer cladding and the moisture-sensitive components of the wall assembly, the rain screen design helps manage water that may accumulate on the exterior surface, directing it away from the building structure. This is crucial for maintaining the integrity and longevity of the building materials and preventing potential damage from mold growth or structural deterioration due to trapped moisture.

While elements like structural support, thermal insulation, and noise reduction may play a role in overall building design, those are not the primary functions of a rain screen. The specific purpose of a rain screen is fundamentally about moisture management, making it an essential component in curtain wall systems to ensure that the building remains dry and protected from the elements.