What is the primary purpose of a primer in roofing applications?

The primary purpose of a primer in roofing applications is to prepare a surface for asphalt bonding. This preparation is essential because it ensures that the adhesive properties of the asphalt are maximized when applied to the substrate. A properly primed surface creates a better chemical bond between the asphalt and the underlying materials, resulting in improved adherence and longevity of the roofing system.

Primers also help to seal the substrate, preventing moisture from penetrating, and can enhance the overall performance of the roofing system by providing a uniform surface that aids in the effective application of roofing materials. While aspects such as color, durability, and insulation are important in roofing, they do not capture the fundamental role that primer plays in facilitating a secure bond, which is critical for the performance and integrity of built-up roofing.