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Originally Posted by PhilE  In a way this is why I checked- This guy is happy to do my rockwool work at the back and sides of the room but he didn't feel it was necessary for the front and roof (where the acoustic is less concern than leeking) |
Without seeing details of the room, I can't comment on whether the front and roof should be treated as substantially. If there's a room above, or even to the side that you're trying to isolate yourself from, I'd recommend treating the roof the same as the walls. If you're building a room within a room, it will only ever be as good as the weakest link.
In the UK, I'd recommend Rocksil. They do various densities; I did my room using RS-45 and RS-60, the latter being the more dense option. Encon was the cheapest place to get it.
Oh, and don't under-estimate how much sound travels along and through surfaces. If I could do it all over again, I'd spend way more time looking into ways to isolatie vibrations that come in from outside (i.e, footsteps above and the people nextdoor) as well as those created inside the studio, (i.e a drummer) .
Hope this helps.