Originally Posted by UK Dreamer
Did you use a multi-tool this time for the foam removal? If so, how did it compare to previous methods? ...and I'm hoping to get to the Peterson museum on your recommendation in a couple of weeks - will see if I can get some of the crew interested too!
Yes and no. The oscillating tool worked very well cutting into the foam on either side of the stud, but the 1.5" blade still made for very slow going. When I removed the framing, I used my pry bar to square up the gulley I made in the foam with the multitool which gave me just enough depth to stand the wall up on my chalk line perfectly plum.
I hope you are able to make it to the museum. Definitely worth it.
Originally Posted by cowger
That is bananas. Yes, I (we) admire your determination to achieve perfection, but me, I would have just thinned down the R13 insulation (it peels apart in layers -- maybe 5 minutes to do all the insulation for the screen wall?)
Exactly whose build thread do you think this is???!!!
I am partially relying on pink fluffy on part of the sound isolation system and couldn't bring myself to splitting the insulation into practically nothing. Not to mention the foam is wavy, so an even split wouldn't translate. I hated to do it at the time, but in retrospect I am glad I did.
Originally Posted by Ladeback
These look interesting, but more work to install then the IB-3 clips. How do these compare in cost to the IB-3 clips? These seem to have more parts to deal with.
Definitely more expensive, but you also get the additional STC performance benefit which is what I was going for. The supplied nuts and bolts were probably more expensive than the entire IB-3 bracket. I wasn't going to let saving a few hundred bucks on lesser decoupling brackets guide my decision, especially on such a financially huge project. The layout of our home puts the theater *mostly* under the first floor 2-story entryway which leads right up to the second floor bedrooms. This is why I also suffered the purgatory of 2 layers of 5/8" drywall with Green Glue in the theater ceiling between the joists.
EDIT - The brackets are very easy to install. You drill two 1/2" bolt holes and one 3/4" bolt hole and then assemble and tighten the bolts. Including drilling the holes, the brackets would only take about 5-8 minutes each to install, and that's being generous. Across my front screen wall I attached the brackets directly to the joists and the process was very quick. The side walls required the separate blocking and special installation considerations because of the bracket offset in relation to the joists above. Maybe I'll put together a separate post showing some of the installation challenges - all of which were no fault of the bracket.
Originally Posted by ereed
Wow, you are making progress
! Now I know who to hire when I need a dedicated theater built.
Sorry, once I complete this theater I am fully booked until my natural death!
And remember, these pictures were from January 2017, so almost 10 months ago!!
Originally Posted by BrolicBeast
Tim, this stuff is unbelievable! Thanks for sharing these details!
Hmmmmm....wondering if "unbelievable" is good or bad.....
Originally Posted by damelon
Man, nice progress! That foam removal though... ugh! looked painful
Thanks. And yes, foam removal was definitely drudgery. It took about an hour per stud bay. The work is physical (that foam really bonds), so you couldn't do it all at once.
Originally Posted by p3bham
Awesome man. As always I admire the willingness to destroy in order to properly create. Hate to hear you had to chase the foam dragon again. Someone above mentioned that spray foam would be better than pink fluffy - correct me if I'm wrong but I've been under the impression that acoustically pink fluffy is better than spray foam as spray foam tends to couple things that shouldn't be coupled and it's the air spaces in the pink fluffy that helps with acoustics. Either way well done on the new work and when drywall starts going up we need to throw a party up in here.
Exactly right. Spray foam is of little to no acoustic benefit. I am using it as an air and moisture barrier against the concrete wall in this instance. The pink fluffy does the heavy lifting for sound isolation which is why I wanted to preserve the full thickness. The room is ready again for drywall after rebuilding all the back boxes in the room. Too much "life" getting in the way, especially after I get home from weeks of work travel.
Originally Posted by HopefulFred
I don't see that product on the http://www.kineticsnoise.com
website. Is CWCA discontinued, or am I looking in the wrong place entirely? I thought you were using the coil-spring brackets (ICW), that I thought were higher performance than something like this. I suppose I misremember.
No, the product definitely isn't discontinued. I don't know why there isn't a separate product page for it. The ICW coil spring brackets are used for suspending the ceiling. I used the ICWs in my last theater and they were fantastic. Because they require an extra 1.5" of height beyond the Kinetics Wave hangers, I decided to go with the Wave hangers this time around to save that little extra bit of ceiling height. The performance of the Wave hangers was very close to the ICW hanger....so close I'm not concerned about the differences.
Originally Posted by HopefulFred
Looking at your pictures, it seems that the torque applied to the main through-bolt is absolutely critical. Your picture of the installed bushing shoes deflection of the bushing itself, creating a zigzag sort of shape where the offset cutouts of the top and bottom portions of the neoprene begin to be compressed into one another. Perhaps as the wall settles this will change - even to deflect in the other direction?
The system is not so precise you need a torque spec. I torqued by hand to the same "feeling". The wall is definitely solid, but you can sway it by hand if you are really pushing or tugging on it, which is simply the sway of the rubber. Maybe I'll take and post a short video of the bracket and wall with me pushing and pulling with all the force I can muster.