Tracking room with concrete walls (and rubber floor). | John Sayers’ Recording Studio Design Forum archive

Hi everybody! I am a couple of days away from finishing this long work in the basement to create an acceptable space for tracking. My main concern now is "soundproofing" the room as much as possible in a low budget way, but load of free work. Here is the previous post I did: viewtopic.php?f=2&t=13151 By now, by breaking down the concrete of the floor (it was all cracked and terribly uneven anyway) I now have a 7 feet floor (from compacted earth to gypsum in between the joists). I had a load of 36” wide ciment compactor track made out of 1/2” rubber that am going to install as the room’s floor. I think it’s going to be a good sound absorber, won’t it? Now I am about to start mounting the walls on existing frames. Here are my main questions for this exciting operation: Concrete walls In this room, as you can see on the pictures below, there is two fondation walls made of concrete. Here are the different possibilities I figured out: - Leaving the concrete walls “naked”. No drywalls, no resilient channels, nothing. I don’t think this would be the best option since the concrete on one of those walls is very falky so I might have to take off concrete bits off the floor all the time. Also, I’d like to put on isolation (pink fiberglass) for confort, on the walls (I’d like to save the more expensive roxul for the empty walls since I believe concrete walls don’t need further sound isolation). - Installing drywall (1 or 2 layers of 1/2”?) directly on the frame (no resilient channels). My concern is that the wall frame is attached both to the concrete and to the ceiling joists... - Installing drywall (1 or 2 layers of 1/2”?) with RC. Empty walls: I am more sure about what I should for the 4 other walls (my room has a slighly “L” shape) : exterior of these single frame walls would be ½” drywall directly on the walls frames. Interior would be 2 layers of ½” on RC channel with Roxul inbetween wood studs. Does it make sense? Here are the pics of the room for now (from left to right): http://img96.imageshack.us/img96/415/dsc05702.th.jpg Left wall from the door. Nice concrete wall with frame (should I remove the wood between the studs?) 13 feet long http://img18.imageshack.us/img18/628/dsc05704j.th.jpg http://img408.imageshack.us/img408/7706/dsc05703.th.jpg Front wall from the door with exterior window. Attached to the left wall. Bad concrete. 14.5 feet long. You can see that big trust right in the middle of the room and a pole supporting it. I can't do anything about it without weakening the building structure... http://img62.imageshack.us/img62/1386/murpiceauto.th.jpg Right wall form the door. 10 feet long. Actually, there is only one pole supporting the trust. The other thing is a lamp! This wall has thick 2x6 I guess on the exterior side. Do I have so remove this wood or can I screw the drywall directly on? http://img183.imageshack.us/img183/2573/dsc05716.th.jpg 3 walls set. From left to right: 6 1/2 feet, 2 1/2 feet (perpendicular) and 8 feet (with the door. So if you take the two parallel walls (6 1/2 feet + 8 feet) it equals the front walls lenght! :lol: http://img99.imageshack.us/img99/3931/dsc05718y.th.jpg This is the entrance. "Microwaves in use"! I'll add some pics of the updated work. Thanks for your guiding lights! Guillaume, Québec, Canada.