How long should Asphalt be allowed to age in order to oxidize and harden the surface?

Allowing asphalt to age for 6 months to a year is crucial for achieving the necessary oxidation and hardening of the surface. During this aging process, the light volatile components in the asphalt evaporate, allowing the heavier compounds to oxidize. This oxidation enhances the physical properties of the asphalt, making it more durable and resistant to environmental stressors such as UV radiation and temperature changes.

Aging for this duration also ensures that the asphalt attains the right consistency and adhesion qualities, which are vital for an effective roofing system. This hardened surface will provide better weather resistance and protect the underlying layers of the built-up roofing system from deterioration.

While other options may suggest different timelines, they do not align with the established best practices. Aging asphalt for a shorter period may not allow sufficient oxidation to take place, leading to a less resilient surface. Conversely, aging for too long could lead to excessive hardening, making the asphalt brittle and more prone to cracking under stress. Hence, the 6 months to a year timeframe is recognized as the optimal period for achieving the best results in asphalt hardness and performance for roofing applications.