Consumer Reports has details on how to get the best deal on new roofing, roofing contractors, shopping for roofing types, and understanding roofing warranties.

The lease will detail whether you own the roof as well as the top-floor flat, or only the flat itself and no space above. Either way, I'd expect that there will not be a provision in the lease to ...

Flat roof – there are three ... If you can't install cold loft insulation because, for example, you're using your loft as a living space or as storage for heat-sensitive items, you will need to ...