Why is a Cutback Coating considered a plain roof coating?

A cutback coating is considered a plain roof coating primarily because it consists of a specific blend where asphalt is combined with a solvent, typically to thin the asphalt for application. This formulation allows for easier application and penetration into the surface of the roof, promoting adhesion and enhancing waterproofing. The use of solvent is what distinguishes it from more complex coatings that may incorporate additional additives for improved performance.

This choice highlights the straightforward nature of cutback coatings; they do not include reinforcing fibers, elastomers, or other complex additives typically found in more advanced roofing solutions. Therefore, while cutback coatings provide some level of protection and sealing, their simplicity is defined by this basic combination of solvent and asphalt. This characteristic also contributes to their classification as plain coatings, as they focus solely on the essential components without enhanced properties.