Rationale

Since its 2015 adoption and subsequent 2018 and 2023 updates and reapproval, ASTM D7897 has become essential for simulating the natural aging of roofing materials. Proposed updates to Sections 8.1, 9.3.3, 10.1.4, and 10.1.5 are designed to clarify technical requirements and reduce the risk of misinterpretation. The changes incorporate direct practitioner feedback to eliminate ambiguities and prevent technical disputes. This draft incorporates refinements to the 2025 proposal to address previous member comments, ensuring the standard remains clear and serves as a globally trusted benchmark.