Quote:
| Otto wrote:
...I'd suppose that if there isn't a weight issue, then you're not using enough sand. And if you're not using enough sand, then you're missing the original goal of soundproofing. If you're using "enough" sand, I would certainly be worried about the weight of the sand lying on what will likely be drywall. Also, what about the "other" stuff that's in there -- wires, pipes, insulation, etc.? And what about building codes? As above, I'd probably call this "experimental," but perhaps Bob knows something else about this procedure... |
Well, if there's one thing we have plenty of at the coast, it's sand
, so I'm curious about the details of this method, too. I'd appreciate some more info from Bob on that.
Otto, any thoughts about how well the concrete walls will either isolate or conduct sound? I'm thinking primarily of the low frequencies.
Although I'm starting new construction instead of an existing basement remodel, I think we'll be in the same boat. I'll have two concrete walls and two framed interior walls enclosing the theater room and, like you, I'm more concerned with the ceiling than sounds traveling to the rest of the basement. I had pretty much decided to go with both methods you mentioned - RSIC and double drywall w/GG (unless it's really cost prohibitive - but I'm only doing the theater room, not a whole basement).
However, it's my understanding (someone correct me if I'm getting too carried away) that even if I get the ceiling isolated from the floor above with a RISC system, if I don't "de-couple" the walls from the floor joists above, I'll still get quite a bit of sound transferring from the walls to the upstairs floor. No problem working with the framed interior walls, but you got me thinking about the concrete walls that can't be isolated from upstairs.
I'm starting with a 9' ceiling, so I can afford losing a little headroom for the clips/channels/double sheetrock there, but I don't really want to lose the room width by framing another wall inside the concrete wall. I hope you're going to tell me it's not necessary.
Thanks in advance for any/all suggestions.
Joe