DJI posted an article you should read.
Updated: Oct 31, 2021
As DJI article states, there are many reason why you need a roof inspection with a drone.
Warranty protection, check for weathering, leak assessments, drainage issues, maintenance damage, solar panel installation and just preemptive checks.
Please read and if you have questions, reach out.
https://enterprise-insights.dji.com/blog/drone-roof-inspections