Oregon Construction Contractors (CCB) Practice Test

What does a rain screen do in construction?

1. Improves insulation

2. Prevents moisture from entering

3. Creates a gap for drainage and evaporation

4. Increases energy efficiency

The correct answer is: Creates a gap for drainage and evaporation

A rain screen in construction primarily serves the purpose of creating a gap between the exterior cladding of a building and the underlying waterproof barrier. This gap allows for the management of moisture by facilitating drainage and evaporation. When rainwater penetrates the outer layer, it can easily flow down the vertical space and away from the building structure. The design of a rain screen not only helps in shedding water but also prevents water from being trapped against the building's envelope, which could lead to issues like mold growth or structural damage over time. This is vital for maintaining the integrity of the building materials and ensuring adequate ventilation to dry out any moisture that may have entered. While rain screens can contribute to energy efficiency, insulation, and protection from moisture, their main function is the effective management of water, making the creation of a gap for drainage and evaporation the most accurate description of their role in construction.