What does "mopping" refer to in roofing practice?

Mopping in roofing practice specifically refers to the application of hot bitumen to the substrate. This technique is used primarily in low-slope roofing systems, where hot asphalt or bitumen is applied to adhere roofing materials, such as shingles or membrane layers, to the underlying structure. The heat from the bitumen not only helps in adhesion but also ensures a watertight bond when it cools and solidifies.

This process is a traditional method that has been used for decades, particularly in the installation of built-up roofing systems and modified bitumen membranes. The use of hot bitumen is crucial for achieving a durable and effective roofing system that can withstand various environmental conditions. Understanding this process is essential for professionals in the roofing industry as it contributes to the overall integrity and longevity of a roofing system.