Now the fun begins...HVAC Sound Proofing
When I first started working with bpape on sound proofing, one of his biggest concerns was the HVAC lines. The original layout of the HVAC supply lines was in the middle of the ceiling joists. This would punch big holes in the "aquarium" I was building to contain the sound.
Original HVAC Supply Line
To mitigate the problem, I moved the supply lines into soffits and built 8' "coffins" out of 3/4 MDF boards. Bpape wanted me to encase the entire HVAC run and get 3+ 90 degreen hits. Given the flex duct snakes through the soffit and other lines, encasing the entire run wasn't feasible, so I encased the first 8 feet. Note, don't try this alone.
I tried to get the beast up in the soffit by myself and end up dropping it. I got help, but it took all three of us to get it in the soffit.RSIC Clips, Furring and insulation
As mentioned, I used RSIC-1 clips on the ceiling and 1x2 furring on the walls. I should mention that the layout of the clips with the additional 2x4 "furring" on the ceiling (perp to the joist) through me and the crew for a bit of a loop. We eventually figured it out (with bpape's help)...
Clips, Channels, and Furring
For HT insulation, I used R19 in the wall and a combination of R19 and Rock Wool (ThermaFiber SAFB) in the ceiling. Since the joist cavity is 9", I used a R19 @ 6" + Rock Wool @ 3". I also put an extra layer of both in the soffits.
An interesting note, I got a bit carried away with the insulation in the rest of the basement. I have hard wood floors above the basement and I wanted a little bit of sound cushion from the galloping herd (ie, kids) above. Well, I didn't stop there... Given this will also be work space, I decided to go ahead and do all the walls too. Before the sheet rock went up it was like a tomb down there with the insulation completely soaking up any sound upstairs or down...
Insulation InsanityOutlet Boxes and Conduit
On bpape's advice, I also sealed the outlet and scones (no recessed lights) for sound control with 3/4 MDF boxes.
On speaker cables, I'm not ready yet on equipment and wiring, so I put conduit around the room. I will pull cable through and caulk at a later date...Hush Box
I posted some info on my hush box connections, so if you want more detail see this thread:
Hush Box connectionsAll Closed Up
The sheet rocking when very well. The crew did the entire basement (1500 sq ft) in one long day. They used 4'x12' sheets, so there will be less seams and also glued/screwed all "basic" (ie, not green glued) walls. This was the first time for the contractor and drywall sub on using green glue. They did a great job...
Looking toward screen wall
Left front wall with support column
Rear wall and door
Future "Lobby" (Frig/cabinet to the left)
That's it for now... The sanding is done. Prime, Paint and Trim will be done this week...