new control room build

So I am building a new control room onto my existing studio, which comprises of a live room, 2 iso booths, and a lounge. The existing studio is in a 550 sq foot detatched garage. I'm usin L.W. Sepmeyer's room ratio of 1 1.14 1.39 control room dimensions height 9.5 feet ( average) length width I'm only making the walls with a 2 by 6 staggered studd frame with drywall dona cona, drywall. The trusses will be made from 2 by 10's, as its a single pitched roof (not gabled). I'll only be monitoring in there and the wall between the live room and the new control room is a very thick triple wall.(currently its an outside wall of the live room) I'm including some very rough sketches of the new room. I'm building this from scratch, so its up to me how great... or not so great the room will be. I'd love to hear your thoughts.

So I did some more research, and I'm going to make some changes. To make a better Mass Spring Mass, I'm going to have 2 layers of OSB on the outside of the wall, and then keep the 2 layers of 5/8 sheet rock on the inside. One question I have, How important is using dense insulation in the walls?? It seems that insulation doesn't change the stc that much. I can either use normal mineral wool insulation, or AFB, which is much denser, but more expensive AFB link http://www.roxul.com/sw34142.asp

you can stick with the lighter stuff. ideally make the 2 hard walls as far apart as you can so the air space can do its work.

Ok, so I have the frame buillt with the 2 layers of osb, and a layer of roll roofing in between. I roof is on. I think I am going to wait until I get Rod's book (it should be here soon) before I continue with any acoustic aspect of the build. here are some pics so fare

more pics 1. osb close up 2. looking outside to the entrance to the live room. I chose not to make a door directly between the live room and the CR to increase stc. So you will have to walk out two steps outside to get to the control room. Its all under cover though. Bad Idea? 3.The front wall looking at the wall between the CR and LR. Its quite thick already, so My only concern is not making the glass the weak link.

So I got my "build it like the pros" book in today. I'm pretty happy about it. i should have bought it a long time ago, so i had it read Before I started to build I have an urgent question about my room design I was hoping to get an answer. As you can see from my room design at the top of the page, My ceiling is angle from 9 to 10 feet. I've realized that I don't have enough room to put my mix position along the short wall, which means that my ceiling will NOT be Symmetrical. ( the pitch will be 10' on one side, and 9' on the other. So My question is: should I fix this by making a peaked ceiling so that the room is symmetrical. The peak would be running front to back at the mix position. I would do this by just nailing in 2 by 6's from the extsting trusses to 6' from the ceiling in one end. But if I do this i will then be changing the room dimensions by about 3 inches. Will this change cause acoustic problems? Its easy to do now because I haven't put up the drywall yet.

cchord59 wrote:

My ceiling is angle from 9 to 10 feet. I've realized that I don't have enough room to put my mix position along the short wall, which means that my ceiling will NOT be Symmetrical. ( the pitch will be 10' on one side, and 9' on the other

However you do it, symmetry on the stereo axis is paramount. Make it symmetrical. Andre

So I think the best way to remedy this asymetrical roof problem, is with a drop ceiling and ceiling panels. I could make the drop ceiling flat, so that the room would be symmetrical. I could then use dense insulation in the air space to act as a bass trap. So the drop ceiling would be flat, and the dry wall ceiling above it would still have a 1 foot slope. I could stuff the void with insulation to make a bass trap. Is this a good Idea?