So after three years, I'm resurrecting this thread! The garage room is not only back on, but will be starting this weekend!
I've only really waited about thirty years for this, so I'm stoked. The problem is, the more I read the more I get confused about what I need to do. The garage is a single brick construction on a concrete pad. It's completely detached from the house. The volume levels I listen at are usually no more than 85ish dB or thereabouts, more often than not it'll be lower than that.
I'm hoping that the length of the internal room will be about 16.5' x only 9' by about 7 ' 2" high, so not brilliant dimensions. The width of the room is my main problem, but I can't do anything about that. Room absorbers, bass traps and diffusers will be used throughout (diy). As with most garages the floor rums off toward the door.
Following is my plan of action up to now, but as above, any advice would be most welcome...
So I'm aiming for the room within a room
principle 2" x 4" Studs with rubber resilient strips (10mm thick x 100mm wide) on the top and bottom sections of the studs, which will all be set 10mm or so from the garage walls. Metal Resilient channels mounted directly to the roof joists and plasterboard attached to those. Breathable membrane will form the back of the studs with walls and ceiling having RW3 Rock Wool insulation and 15mm Acoustic plasterboard attached. 5mm gaps all around sealed with Acoustic sealant. There will be only one door into the place and so I'm thinking of the heaviest door I can find (maybe a fire door? I'm not sure). The floor will be 2" x 4" joists, lessening to 2" x 2" at the other to compensate for the slope. 50mm Celotex insulation and topped with 22mm chipboard.
For breathing, which was mentioned earlier and I'm sure you'll agree a necessary requirement, I'm thinking of an Axia (or some such) heat recovery unit.
Am I way off the mark here, will it be a pig and just not work, are there much better options? If so then please let me know before I start. We're surrounded by other houses and it's pretty quiet at night round here and I will listen late into the evening...
One other question I'm totally unsure about is, should I construct the floor and ceiling first then build the stud walls on top of the chipboard and fastened to the ceiling plasterboard (using the rubber strips)? Or screw the stud directly, well through the rubber resilient strips, to the concrete slab? Then attach it to the ceiling joists, again through the rubber strips? I know there is much written about this subject, but I'm reading conflicting theories as is always the case. If you can offer any thoughts then please do..
Thanks all