01
Document severity and distribution
Record whether flaking is thin and superficial or whether whole layers and corners are separating. Compare exposed and sheltered slopes and note moisture, freeze-thaw and runoff patterns.
02
Test representative areas carefully
An experienced slater can inspect sound, edges and cleavage without destroying good roofing. Avoid aggressive tapping or walking that creates new damage.
03
Separate isolated pieces from systemic failure
A few damaged units can be replaced. Widespread progressive delamination across the same product may require sampling, testing and a long-term replacement strategy.