Sorry for the new thread, i figured it would get more views here than my own construction thread.

OK so final steps in my sound proofing scheme are underway. The room will be drywalled on monday. I built plywood-gg-ply boxes for all electrical outlets and wiring penetrations in the room and stuffed the boxes with insulation. Now, as i plan my drywall install, it occurred to me that I may have just created a triple leaf wall. Have I done so or am i overly paranoid? Some of the boxes are quite big as there were multiple holes in a small space for wiring/conduit/electrical boxes. For example, at my equipment rack location, i built a box that is almost 3 feet tall that houses all my speaker cables, 4 electrical outlets, all my video wires, and also my conduit. The box is also stuffed with insulation. Here's a pic to show what i mean as i have a feeling im not getting the point across very well.
http://img.photobucket.com/albums/v212/Minhas/House%20Construction/IMG_0434.jpg
(both boxes are actually stuffed with insulation)

So, is that creating a triple leaf once drywall is up? Should i pull out the insulation or remove the boxes completely?


Next question relates to the actual GG process for the walls+ceiling.
Here is my planned method of attack, please let me know if I am missing something or if there is something i dont really need to do. I'd rather not have to use as much sealant as i have in this plan.

First layer Drywall:
-Drywall ceiling first, caulk seams where ceiling meets walls.
-Heavy bead of caulk on floor. Squish Drywall on top of caulk.
-Use mud on all seems. Make sure none leaks out on face of drywall to ensure proper, flat contact with second layer
Second layer Drywall:
-Heavy bead of caulk on floor. squish second layer of drywall on caulk.
- 3 tubes GG per sheet of drywall, squish against first layer of drywall. Use normal drywall nails
-Make sure seams of first layer of drywall dont line up with second layer.
-Second layer of ceiling with GG
-caulk seams between ceiling and walls and walls and floor (moulding will be placed on ceiling and baseboards on floor)

How does that sound? Have i missed anything?
Should i bother caulking the sides of the drywall sheets or just close the gap after the walls and ceiling are all installed?) ie. caulk the sides of the ceiling drywall sheet before putting on wall sheet or just close the gap after both are installed? Same with the floor, should i squish the drywall onto the bead of caulk, or just caulk the gap at the bottom after each layer of drywall is up?


Thanks in advance,
Sunny

Edit: Why didnt i put this in the green glue thread? 2hrs of sleep skews my logic :( sorry guys!

Drywallers coming in 6 hours, anyone wanna throw in a last second suggestion?

Drywallers coming in 6 hours, anyone wanna throw in a last second suggestion?


Yes. Walk around your room and beat everything with a broom handle and see if it rattles. You may find that just need caulk anywhere and everywhere. A big sub in the room at high volume would be nice also and it is good to get to know the room before the walls go in.

So, is that creating a triple leaf once drywall is up? Should i pull out the insulation or remove the boxes completely?

You don't have to worry about that. Boxes are only a small amount of wall area. Leave 'em.

Regards,
Terry

thanks for easing my mind terry! My sound proofing mission is almost complete. Just need to go back and caulk the seams on the second layer tomorrow. I hope all this effort pays off!

I'm probably too late but, but use screws not nails....

The way you should have done it is at:
http://www.soundproofing.org/treatments_for_sound_control.htm

A free report is available at:
http://www.soundproofing.org/infopages/aweber.htm

ok so i made a nice big uh-oh....

I had said earlier that i had to go back and caulk the seams on the second layer. Well, that didnt happen. I was told that taping would be started on saturday, so i was leaving it until friday when i had more time to go in there and caulk away. but guess what? they showed up on thursday. i sure as hell hope my seals were good on the first layer.

bjnash -

Many here would differ with your companies view. Not very helpful to tell someone how you think they should have done it after the fact.

If you want to be helpful to people around here you should take some time to find out what we as a group actually know.

It may be too late to tell someone what they should have done, after they've done it, but not for those contemplating the same process/project. Proper caulking/sealing is critical.

I've come on this forum off and on for many years and when it looks like people here are floundering on the subject of soundproofing, (Not sound conditioning) I try to remind them they don't have to go it alone- many of these things have been figured out and materials have improved over the years.
Our soundproofing website has been up since 1997 and a wealth of knowledge is available there as well as at the Soundproofing Forum that we mentor. www.supersoundproofing.com
Another site that may be of interest is
http://www.squidoo.com/Mistakes-in-Soundproofing-Materials-Insulation and could save someone lots of time, money and effort.

bjnash - Just spamming your company's website and making unfounded statements about the value of the information found on this forum doesn't sit well with me. I'm sure I'm not the only one.

Are any detailed instructions on how to deal with the sound leakage through electrical boxes available? Or sites where I can find more info? I plan to use sound isolation clips, furring channel, drywall, green glue and drywall. This extends my drywall surface quite a bit from the studs and I'm trying to figure out how to attach the electrical boxes securely and in such a way that sound does not leak through the opening. I've seen suggestions on the use of Quiet Putty but still am at a loss on attaching the box.

Are any detailed instructions on how to deal with the sound leakage through electrical boxes available? Or sites where I can find more info? I plan to use sound isolation clips, furring channel, drywall, green glue and drywall. This extends my drywall surface quite a bit from the studs and I'm trying to figure out how to attach the electrical boxes securely and in such a way that sound does not leak through the opening. I've seen suggestions on the use of Quiet Putty but still am at a loss on attaching the box.

ditto on his question