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Back to the non-existent Phase 2...
Yes, i used 703 on both the outer wall and the inner walls, in the floor, and in the ceiling, and there is 2" of dead air between the outer wall and the inner shell. The entry... 2 foam filled doors to the outside is the only area where sound is leaking through. I'm going to treat it and look at some other solutions for a more tighter seal.
I haven't measured with a dB meter but i've spoken with my neighbors and its well within the realm of their happiness. I had a really hard drummer in recently and my neighbor didn't hear anything within 20 feet of the building. It was only when he got really close to the entry door did he hear anything, and it was a 70's Supraphonic so go figure.
Back to the construction materials. We of course doubled up and used 1/2" and 5/8" drywall on all interior walls and ceilings. The floor beams were floated with U-Boats, and a laminate floor was installed. All windows are double pane, energy star. The large natural light window (4 panes in all) has a 7" gap between the 2 main pieces. Light spray foam was used in the 1" gap between the finishing frames, then sanded and painted so it appears to be seamless piece of trim, but it is pretty well isolated in the middle.
In the isolation room, i used 703, pressed to the wall with a light wooden flat diagonal fence, covered in a fine but breathing fabric. I can't remember which fabric it was. It wasn't expensive but much much nicer than a burlap or even a cotton/nylon weave. We also used this for built-in bass trapping in the rear corners of the CTRL room, although its secured with a finer, thinner plastic fence weave. It worked quite well.
You can see the navy fabric in the isolation room pics. Pics of the rear of the ctrl room are coming soon...
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