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RD- Check out the Thermafiber website. The stuff you want is the 3-in FS-15 Fireblanket. I was able to pick some up from a distributor in San Diego County. If you call them they can give you the name of someone in your area. http://www.thermafiber.com/ Alex

I vote for rockwool in the cavity and two layers of gypsum; skip the RC channel. Alex

Say Fitz, How did you get the sand back out when you dismantled them? Alex

Check out the prime diffusor over at Longsought For Sound: http://www.longsoughtfor.org/postn/html/modules.php?set_albumName=DIY-Audio&op=modload&name=gallery&file=index&include=view_album.php There was a thread awhile back where Kevin described where he came up with the design. Maybe he'll...

Keep track of where your channels and studs are located, by marking adjacent panels, floor, and cieling. With each additional layer, get successively longer screws (e.g., 1-5/8 for the second layer) and screw them to the channel underneath the preceding layer(s). As long as you are only...

Are you wanting to build a box to put your amp in? Alex

Unfortunately it's tough to predict since there are so many variables. Most charts are put out by drywall manufacturers and don't cover exactly the type of construction you're considering. In addition, STC is an average rating across the audible frequency spectrum and can be particularly...

Try reposting this under "The Rack". Alex

His room turned out pretty good. It's basically built inside about 2/3 of a standard 20' x 20' garage. If you can envision it -- two of the walls have a large air space--one to the west where the garage door is; and one to the south where he's left space for his washer and dryer as well as an...

Sounds good. You may want to go with 5/8-in sheetrock on your exterior shell and eliminate the channel on this wall--there's some school of thought that low frequencies are actually reduced better by non-resilient hung mass. For insulation, use 3-in mineral wool batts. Make sure you have a...

For caulking large gaps, you can get something called "backer rod", "caulk saver" or similar description--it's basically a foam rubber cabel, 3/8-in or 1/2-in diameter that you can shove in the gap and then caulk over. I'm faced with the jamb dillemna as well--my solution will be to glue or...

RD, Don't think you need to caulk your RC channel. For my room, I taped and mudded all the joints between boards, including corners and ceiling; both on the base layer and face layer. Also mudded over the screws. IMHO this is sufficient to provide a good air seal and simpler to apply and...

Attach your trim to the sheetrock with finishing nails. Don't nail it all the way through to the studs (though I doubt you could if you tried ;) ). Alex

RD, Silicone caulk is fine--that's as flexible as you can get. The best stuff is the pure silicone based kind, but it's more expensive than others that use a blend of silicone with other stuff. They all say they're guaranteed to be flexible for 15-20 yrs, so go with your gut. The RC channel...

RD, Sounds like you're on the right track. If the isolation you achieve isn't sufficient with a single layer of drywall on your RC channel, I'd try adding another layer of sheetrock to the channel, rather than stripping it back to the studs as I think you described. Drywall/Channel/Drywall...

Ambi, From the SAE site index, click on "Absorbers". This will pull up a page showing how to build High, Mid, and Low frequency absorbers. Alex

It's under the "Index" listing on the main page at the following link: http://www.saecollege.de/reference_material/index.html Check again. Alex

Marcos, For definition: Isolation means you want to keep the sound from escaping from your room to the outside world. In this case you need "sound proofing". To sound proof an existing room you'll need to reinforce your existing walls with things like drywall and resilient channel. If you...

I understand. Post some pictures as well as additional construction details from your contractor and we can try help out. From a total isolation perspective--nothing beats the room-within-a-room. Good Luck, Alex

. Show off :D . Alex