40 Hour Property and Building Inspection Practice Test

How should valley flashing be designed at the bottom?

1. It should narrow to concentrate water flow

2. It should widen to accommodate more water

3. It should be angled for better drainage

4. It should be completely vertical

The correct answer is: It should widen to accommodate more water

The design of valley flashing at the bottom should be widened to accommodate more water. This is essential because valleys are areas where two roof planes meet, often channeling a significant amount of water during rainstorms. By widening the valley flashing, it provides a larger area for water to flow into and be directed away, reducing the risk of water pooling or backing up, which could lead to leaks or water damage. Wider flashing contributes to improved drainage efficiency, as it allows water to disperse more readily rather than concentrating in a narrower channel, which could overwhelm the system. Properly designed valley flashing is crucial for maintaining the integrity of the roof and ensuring that water is effectively diverted away from the structure below. Inadequate flashing width can lead to increased wear and tear on roofing materials and potential costly repairs over time.