Why should Aluminum Roof Coatings be applied to stable substrates?

• A. To ensure color consistency
• B. To allow for easier cleanup
• C. Fresh bitumen may allow the surface to float and move, breaking up the surfacing
• D. To enhance the reflective quality

Answer: (C)

Applying aluminum roof coatings to stable substrates is essential because fresh bitumen, which may be present on the roof surface, has the potential to become unstable and move. When the substrate is not stable, the bitumen can 'float' and shift under the weight of the coating or due to temperature changes and thermal expansion. This movement can cause the surfacing material to break apart or become compromised, leading to potential failures in the roofing system.

Stable substrates help ensure that the aluminum coating adheres properly and remains in place, providing the intended protective and reflective qualities. Therefore, maintaining a stable base is crucial for the long-term performance and durability of the roofing system after the application of aluminum coatings.