North Carolina Home Inspector Practice Exam

Where is a fiberglass shingle roof most likely to experience leaks?

1. At the edges

2. In the valley

3. Near the vents

4. Underneath the tiles

The correct answer is: In the valley

A fiberglass shingle roof is most likely to experience leaks in the valley. Valleys are areas where two sloped sections of a roof meet, creating a channel for water runoff. Because of this design, the valley collects a significant amount of rainwater, which can increase the likelihood of leaks if not properly sealed or maintained. Proper installation is crucial in these areas; flashing must be correctly positioned to guide water toward the gutter system and prevent it from seeping underneath the shingles. Over time, factors such as wear and tear, accumulation of debris, or improper installation can compromise the integrity of the valley, leading to leaks. Other areas, such as the edges or around vents, can also be susceptible to leaks, but the specific design of the valley makes it particularly vulnerable to water intrusion, especially during heavy rainfall. Proper maintenance of these roofing structures involves regular inspection and upkeep to ensure that valleys are clear and functioning as intended to direct water flow safely away from the roof.