What should happen when the water-resistant barrier and flashing are properly installed?

When the water-resistant barrier and flashing are properly installed, the primary function is to ensure that any water that manages to penetrate the exterior cladding drains down and out through designated openings. This drainage system is crucial for preventing water accumulation behind the wall covering, which can lead to moisture issues, mold growth, and deterioration of building materials.

The water-resistant barrier acts as a safeguard, allowing any water that penetrates the exterior to escape rather than become trapped behind the wall assembly. This successful drainage relies on the correct installation of flashing, which directs water away from the wall and towards proper drainage points, thereby maintaining the integrity of the building structure.

In this context, the other options do not accurately reflect the intended purpose and function of water-resistant barriers and flashing. Water should not remain trapped behind the wall covering, as this could lead to serious health and structural issues. The idea that water should evaporate before reaching the barrier is unrealistic, as it does not account for instances where water breaches the exterior. Lastly, while sealing the barrier tightly against the wall is important, it does not guarantee that trapped water will be expelled if the drainage system is not effectively designed. Therefore, the correct understanding hinges on the role of allowing water to drain safely away from the structure.