Originally Posted by BllDo
I'm also very interested in this question. The IB-1 are definitely more appealing from a pricing stand point. I'd be interested to hear what you find out.
Does anyone have any experience using IB-1 clips?
Ted was very helpful in answering my questions via PM. He said that he recommends IB-1 clips only with double drywall and green glue. I also asked him a couple other questions, which I'll post here for reference.
Me: Do I need to seal between the drywall on my subfloor and the floor joists with acoustic sealant? This would seem inconsequential if I am doing double drywall and clips and channel on the ceiling.
You do not need the sealant. There is no data on this issue, and this technique is based on an old system that used fiberglass instead of Green Glue. That old system always had sealant, with the goal of bonding the ceiling together to act more as one big lamination instead of all these strips. I think that assessment is flawed, and the sealant is another expense so we're going to be removing the sealant from our diagrams
Me: Is fiberglass insulation in my walls going to make much of a difference? I will be putting fiberglass insulation in the ceiling because that path is my main concern. With my walls I am only concerned with flanking noise, since there are no adjacent rooms.
You want to avoid hollow cavities that will be bombarded with sound, because they will resonate. Also, sound will flank upstairs through your walls, unless you build the walls as robustly as the ceiling.
Honestly, I was a little surprised by his answer to the sealant question. I have a few fairly large gaps between my floor joists and drywall where I just didn't make great cuts. I think I'm still going to at least seal a couple of those bigger ones in the more critical areas.