Some areas may be unsuitable for coating or require different work. Exclusions need to be shown clearly so the owner understands what the project will and will not address. A uniform-looking finish can otherwise hide differences in responsibility.
What to do next
Request a plan marking included, repaired, and excluded areas. Ask how boundaries between treated and untreated surfaces will be detailed. Keep excluded conditions in the maintenance record so they do not disappear from attention after the project closes.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.