Flanking noise when treating common party wall.

Hi Rod. Sorry for being confusing. I put clips+channel on the ceiling joists and on the common party wall. On these I hung 2 layers of Gyproc. The new Gyproc on the ceiling stops short of all four existing walls by approx 10mm. The new Gyproc on the wall stops short of the existing side walls and the floor, but it now touches the new ceiling. So basically the new Gyproc on both the wall and the ceiling touches nothing but each other. Where the new wall meets the new ceiling, I have filled with filler. I haven't caulked any of the edges yet.

Sarah E, I am curious how this is turning out. Have you guys reached a satisfactory noise reduction yet or is it still in an on going status? Thanks, Brien

Sarah, it's a couple of years later and I'm just wondering how this worked out for you in the end, after sealing? It's an interesting thread, and could be very useful to others in your same situation. - Stuart -

Soundman2020 wrote:

Just one note of caution: Be very careful with your plasterboard screws to make sure that none of them go into the joists! That would "short circuit" the clips entirely, making all your hard work for nothing. You need to make absolutely certain that your screws go ONLY into hat channel, and don't come near the joists... - Stuart -

Hello, everyone - So short screws will avoid the risk of driving them into the joists. Is there a problem if the screws through the drywall touch the actual (RSIC or other) clip itself, such as the washer on top of the RSIC clip? Thank you for any advice...I couldn't find this info on any of the clip manufacturer sites.

Depends what part of the clip it touches! If it touches the part that the hat channel clips into, then no problem, but if it touches the rubber or the part that screws into the stud, then you have the same problem. This is why it's so important to measure very carefully, and transfer the locations of studs, clips, wiring, HVAC ducts, etc. onto the floor or ceiling, and the drywall as it goes up, so you don't make mistakes. - Stuart -

I can also attest to the surprisingly poor isolation characteristics of residential brick masonry construction. I'm in a brick rowhouse built around 1927 and can hear my neighbors quite easily. :-\ -Dan.