Make the hidden work part of the scope
Before agreeing to a replacement, discuss what happens after the existing covering is removed. The quote should explain how concealed damage will be documented, how additional work will be priced and who approves it. Keep those decisions with your project records.
Match the approach to each roof area
The collection includes pitched-roof preparation and low-slope membrane work. Different roof areas may require different systems. Ask how the proposed assembly addresses your roof shape and transitions, rather than assuming one surface material belongs everywhere.