What effect does larger amounts of water have when in contact with hot bitumen?

When larger amounts of water come into contact with hot bitumen, the heat from the bitumen causes the water to rapidly vaporize. This rapid vaporization can effectively chill the bitumen, leading to a decrease in its temperature. As the temperature of the bitumen drops, its viscosity increases, making it more challenging for the hot bitumen to achieve optimal adhesion to surfaces. Hence, the reduced temperature can disrupt the bonding process, weakening the adhesion that is critical for the integrity and performance of the roofing system. This phenomenon can lead to issues such as delamination or reduced overall performance of the built-up roofing system. Therefore, chilling the bitumen in this way directly impacts the quality of adhesion.