What temperature is crucial for maintaining adhesion of bitumen during application?

Maintaining proper adhesion of bitumen during its application is paramount for ensuring the effectiveness and longevity of the BUR system. High temperatures are crucial for bitumen because they allow the material to flow more easily, ensuring that it properly penetrates the reinforcing fabrics or substrates and creates a strong bond. When heated, bitumen becomes viscous and adhesive, enabling it to bond effectively to surfaces and other layers of the roofing system.

At high temperatures, the bitumen can fill in any irregularities in the substrate, which is vital for achieving a watertight seal. Additionally, high temperatures help to facilitate the evaporation of any solvents present in the bitumen, which can further enhance adhesion. Applying bitumen at temperatures that are too low may result in insufficient bonding, leading to issues such as separation or water infiltration. Therefore, the emphasis on high temperatures is fundamental in achieving optimal results during the application of BUR roofing materials.