We are running into leaking back porches and sun rooms. The permanent solution is to remove the existing roof. Fix all framing and decking issues. Then go back with a TPO roof that is fully adhered. The roofs we put on have a life span of around 20yrs. And the good part is there is very little slope needed.
We can handle any complexity of roofing issues involved in this type of application. We are roofers and framers. So there isn’t anything we run into that we will not be able to complete.