How do you keep isolation and stop sound leak at gap?

I have an existing observation window in an existing wall. It is a two pane window but it's all monolithic. I'm considering a second interior wall for isolation. Refer to illustration... how do I keep the new wall seperate but plug the sound leak? Creature 82

Rod's book covers this really well. In short, each wall has its own window and there's no firm connection between walls, although around the glass between windows, it looks to the naked eye that they are. There are great threads and illustrations here on the Construction Forum that demonstrate ways to do it as well... I'd help you fnd them, but I'm on the Treo, making such an effort futile. Also, the glass needs to be SINGLE PANE, preferably laminated glass, and roughly 1/3 the thickness of the total amount of drywall in order to "keep up" with the rest of the wall. --Keith :mrgreen

Hmmm... I understand the one glass per wall in Rod's book, but I already have a completely constructed window in one wall. It seems to me it woud be unwise to remove the inner glass from the window that I have to put in the new wall. I think it would make better sense to caulk the gap that I illustrate, but I don't know for sure. I'd like to stuff it with something that blocks airborn sound and doesn't transmit structure-born sound... maybe more of that Norseal stuff? lime jello? Creatch

Creature82 wrote:

Hmmm... I understand the one glass per wall in Rod's book, but I already have a completely constructed window in one wall. It seems to me it woud be unwise to remove the inner glass from the window that I have to put in the new wall. I think it would make better sense to caulk the gap that I illustrate, but I don't know for sure. I'd like to stuff it with something that blocks airborn sound and doesn't transmit structure-born sound... maybe more of that Norseal stuff? lime jello?

Creatch, why don't you just take a sawz-all and cut the existing frame flush with the inside face of the existing wall asembly. Them build your interior wall and re-install the existing window/frame within in? Then all you would have to do is finish the spot between the frames - which is easy and clean. THAT is your best solution - without a new window frame - or new windows - yet maintaining max isolation. Rod

take a sawz-all and cut the existing frame flush with the inside face of the existing wall assembly.

Well.... I don't know about "easy" (for me) but it does make sense and it beats the alternative. Thanks for bearing with me. Thanks, Creatch

Some we catch when they're early in the planning stage. (That's what happened to me.) Some we catch when they're just starting to build. Some we catch well into the build. Some we catch just as they're finishing the build. Some we catch after the build, when they're not happy with the results. Some we never catch. It could be worse, my friend. :) Hang in there... We'll get you through! :D --Keith :mrgreen: