Which factors affect weight of 2 ply modified bitumen roofing in asphalt or bitumen modification systems?

The weight of 2-ply modified bitumen roofing is influenced by several factors, including the type and thickness of the bitumen used, the presence of reinforcing materials (like fiberglass or polyester), and the overall design of the roofing system. Additionally, the application method and the presence of any additional coatings or granules can also impact the final weight. Environmental conditions during installation may further affect the material properties and weight.