I have to fix a flat roof of about 60 sqm. Right now it has an ancient layer of bitumen (at least 35 years old, maybe even over 50, I'm not sure). The bitumen is slightly porous and not really smooth (but not terribly bumpy either, I hope).
As far as I understand, the way to go is to cover it with a layer of EPDM rubber. There is a lot of information available online about how to use the EPDM, even a lot of videos that explain very thoroughly how to install the EPDM layer.
But most videos I found show people putting the EPDM layer onto a wood layer. I found one video that showed adhering the EPDM on bitumen, so I guess that generally it should be okay to put the EPDM on bitumen, right?
But what about a bitumen layer that is not smooth? Is it still okay to put the EPDM directly onto that, or would I have to put another layer onto the bitumen first, to make it smooth?
And also, what kind of glue should I use? To my understanding, there is glue with or without dissolvent, but I couldn't find any information about what's the practical difference between the two. Which one would be advisable to use in my situation?