Originally Posted by CJO
Originally Posted by [B
will1383[/b]]...As for the hat channel offset, The metal piece is not wide enough to actually fasten both layers of drywall to it unless you toe in the screws. Make sure you use the acoustical sealant along those seams.
I had planned to toe in the screws.
Originally Posted by [B
will1383[/b]]Cracks come from the combination of a rigid area connected to a moving area. In theory, the combination of the hat channel, acoustical sealant, and green glue should make the entire system flexible enough to prevent cracks along those seams. Then, when you tape up the 2nd layer's seams, everything should be alright...
I am about to purchase my hat channel and clips, and I'll also be posting pictures and an explaination of how I did it...
The more I think about it, I should probably just space it for attaching the second layer of drywall. I.e., keep the first channel 3" from the wall, place the second one 2'-5/8" from the wall, and then space them 2' O/C from there.
Or, maybe I should wait to see how you do yours and see how it turns out!
Well, I'm still a couple of weeks away from being at that point. But I will definitely share my findings and little quirks. I have a boatload of flanking issues I need to resolve, and I still need to build my speaker enclosures. That won't take me long, but getting my hat channel and everything laid out will take a couple of hours. I'm running electric this weekend, and I'm going to dry wall the other rooms. So, I have a ton of work todo before I get to the clips and hat channel and if you are on a time schedule, you should probably just get it done.
I have yet to order my clips, GG and the other sound iso stuff. I'm going to do that Monday, after I get a chance to talk to one of the guys over at the sound proofing place (same as suggested here). I ordered 460 feet of hat channel. I need to make sure I order enough clips and lay out the walls properly...
I have one problem, though. All the clips I see are made to take hat channel no larger than 7/8" x 2 5/8". I cannot find anything that's less than 2 3/4". I was told that it's a tight fight, but that they will fit, depending on what clip you get. I know the IsoMax clips will work because they have rubber that completely encompasses the hat channel - they have no metal-to-metal contact on them. That's one issue I have to contend with.
As for my dry wall, my first layer is going to be laid horizontally, using 4x10' pieces. I'm then going to use 4x8 sheets vertically for my second layer. I already know the edges aren't going to line up properly, but I have not yet figured out exactly how I'm going to lay out the clips and hat channel. My room is basically 15x14, so it worked out for me that I could buy 12 4x10 sheets for the first layer, and 15 4x8 for the second layer. My ceiling is a bit more complicated, and works out to be a 4 4x12 and 2 2x10 sheets of drywall for each layer. I'm going to do my ceiling first.