there is a book that was written more for the part of california where I live but it has lots of good information on how to landscape to provide the most protection for fire it is called
Firescaping by Douglas Kent
as far as living roofs go I would not plant a lawn on a roof but sedums instead or other plants that hold a lot of moisture and resist burning. you can plant a moat of cactus or nastursium, a plant that is to wet to burn well and it can provide some protection. the book firescaping reminds me of permaculture in that it takes the idea of zones but then uses plants for each zone based on how flammable it is rather than use for food. the ideas work well together.
I also like fire mimicry but doing a search I find other things also called fire mimicry. I first learned about trying to imitate what would happen if fire was not suppressed from here https://suddenoaklifeorg.wordpress.com/category/fire-mimicry/page/9/