What factor can be adjusted to achieve the required weight when applying asphalt?

The thickness of the application is a critical factor in achieving the required weight when applying asphalt. By increasing or decreasing the thickness, you can adjust the overall weight of the asphalt layer being applied to the roof. A thicker application will yield more material and, consequently, increased weight, while a thinner application will reduce the weight. This adjustment helps meet specific weight requirements based on the roof's design and the performance specifications needed for the roofing system.

Other choices involve different aspects of the roofing process but do not directly influence the weight of the asphalt application as significantly as thickness. For example, the type of aggregate used impacts the texture and performance characteristics of the roofing but not directly the weight of the asphalt itself. The rate of heating primarily affects the viscosity and application performance of the asphalt rather than weight. Lastly, the composition of the asphalt dictates its physical and chemical properties, which influence durability and performance but not directly the weight of the application.