North Carolina Home Inspector Practice Exam

What material is typically used for cap flashing in roofing?

1. Aluminum

2. Plastic

3. Copper

4. Steel

The correct answer is: Copper

Cap flashing is a crucial component of roofing systems, designed to direct water away from seams and joints to prevent leaks. The material used for cap flashing is important because it must resist corrosion, withstand weather elements, and have sufficient durability to last over time without degrading. Copper is typically chosen for cap flashing due to its longevity and resistance to corrosion. It develops a patina over time that actually protects the underlying metal, allowing it to endure harsh weather conditions effectively. This makes it an ideal choice for cap flashing, especially in areas where durability is paramount. Its aesthetic appeal is also a factor, as it can complement various roof materials. While aluminum is lightweight and can be used in some applications, it may not provide the same level of durability as copper in roofing applications. Plastic is often too flexible and not strong enough for use in cap flashing, leading to potential issues with integrity over time. Steel, while strong, is prone to rusting unless specifically treated, making it less favorable compared to copper for long-lasting performance in roofing.