What characteristic differentiates modified bitumen from roll roofing?

The characteristic that differentiates modified bitumen from roll roofing is that roll roofing often has exposed nail heads. Modified bitumen systems are designed with additional reinforcement and often use a method of installation that mitigates the need for exposed fasteners. This can be an important distinction in terms of performance, durability, and aesthetics.

Modified bitumen is designed to adhere better to surfaces and create a more seamless waterproof barrier, which helps prevent issues related to water infiltration that can occur around exposed nails. This distinction is crucial for understanding the differences in installation practices and the overall integrity of the roof system.

In contrast, roll roofing typically has a simpler installation method, which may leave nail heads exposed, making it more susceptible to leaks and water damage over time. The difference in how these materials manage fasteners is a significant factor in their performance in various weather conditions.