What is the width of the smooth area known as selvage in double-coverage roll roofing?

The correct answer reflects the standard dimensions found in double-coverage roll roofing. The selvage, or the smooth area that helps with the overlap of roofing materials, is typically 19 inches wide. This dimension allows for effective sealing and proper water runoff when the roofing is installed, which is crucial for maintaining the integrity and durability of the roofing system.

Understanding the role of selvage is important in roofing applications, as it directly impacts the ease of installation and the overall performance of the roofing material. The 19-inch selvage provides enough coverage to ensure that there are minimal gaps for water infiltration, especially in overlapping sections where two rolls meet.

The other dimensions offered do not align with commonly used standards in the industry for double-coverage roll roofing, which is why they are not the correct choices.