40 Hour Property and Building Inspection Practice Test

Roll roofing is commonly used in which type of flashing detail?

1. Chimney flashing

2. Valley flashing

3. Wall flashing

4. Ridge flashing

The correct answer is: Valley flashing

Roll roofing is often utilized in valley flashing details because this material provides a continuous and seamless installation that is essential in areas where two roof planes meet and water can gather. The construction and design of roll roofing make it particularly suitable for valley applications, where effective water drainage is critical to prevent leaks and moisture intrusion. In valley flashing, roll roofing helps create a waterproof barrier that directs water away from the roof structure, minimizing the risk of damage. Since valleys can be prone to water accumulation due to their design, roll roofing’s durability and ease of installation make it an excellent choice for this application. Other types of flashing, such as chimney, wall, and ridge flashing, may require different materials or techniques that are better suited for their specific functions, focusing on vertical structures or transitions rather than the horizontal flow of water typically encountered in valleys.