North Carolina Building Contractor License Practice Exam

What type of asphalt is most commonly used in roofing?

1. Exposure

2. Modified

3. Cold-applied

4. PVC

The correct answer is: Exposure

The most commonly used type of asphalt in roofing is commonly referred to as "exposure," which typically involves a type of asphalt shingle designed to withstand various weather conditions. These shingles are treated to be resistant to moisture and UV exposure, ensuring durability and a longer lifespan for roofing applications. The design allows for the shingles to be installed with some surface area exposed to the elements while providing protection underneath. In contrast, modified asphalt is a variant that has been altered for better performance characteristics, such as improved flexibility and resistance to extreme temperatures, which is useful in specific applications but not as prevalent in standard roofing. Cold-applied asphalt refers to a method of application rather than a type of asphalt itself, and it's generally used for specific roofing tasks where heat application isn't feasible or desired. Lastly, PVC pertains to a type of roofing membrane made from polyvinyl chloride, which is quite different from traditional asphalt-based roofing products. Understanding these differences helps clarify why exposure asphalt is the go-to choice in standard roofing scenarios.