decoupling with 2x4 baseplate and 90 degree rotation of studs - AVS Forum
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post #1 of 23 Old 11-13-2014, 01:13 PM - Thread Starter
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decoupling with 2x4 baseplate and 90 degree rotation of studs

Hello !

is it possible to do some minor decoupling by rotating the 2x4 studs over a 2x4 baseplate and then spacing the studs appropriately?


somewhat like this?
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post #2 of 23 Old 11-13-2014, 01:50 PM
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There's no strength in that wall. Push on one of those studs and you get a lot of deflection. Even a 2x3 facing the conventional way would be better than the way shown.
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post #3 of 23 Old 11-13-2014, 01:53 PM
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I don't think it could work....it would be like turning your feet sideways and hoping they keep you up if you lean forward. Drywall puts constant pressure on studs (like holding a toddler...pressure is down and forward)
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post #4 of 23 Old 11-13-2014, 02:50 PM - Thread Starter
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offset studs for decoupling

thank you both very much. I understand.
would there be any increased strength in a configuration like this? Or still insufficient strength for the trade-off?
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post #5 of 23 Old 11-13-2014, 03:52 PM
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That wall doesn't look decoupled anymore, now does it?
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post #6 of 23 Old 11-14-2014, 03:57 AM
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The coupled studs would get in the way of sound isolation. Your prob better off doing typical staggered studs with furring in front of the top/bottom plates.
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post #7 of 23 Old 11-14-2014, 09:25 AM
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The difference between doing what your suggesting and doing it properly with a 2x6 is only 2". Is there anything so critical in your plan that loosing 2" (or 4" if two walls) is going to make or brake your space?

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post #8 of 23 Old 11-14-2014, 11:04 AM
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not sure what you are trying for.. but how about ROXUL insulation and 2 layers of sheet rock with green glue in the middle?

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post #9 of 23 Old 11-14-2014, 11:56 AM
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Quote:
Originally Posted by fschris View Post
not sure what you are trying for.. but how about ROXUL insulation and 2 layers of sheet rock with green glue in the middle?
Double drywall and green glue adds mass and damping. Staggered studs adds an element of decoupling as well.

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post #10 of 23 Old 11-15-2014, 04:25 PM - Thread Starter
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Quote:
Originally Posted by BllDo View Post
Double drywall and green glue adds mass and damping. Staggered studs adds an element of decoupling as well.
You're right. stop messing around "me".
2x6 decoupled it is. I understand that 24" OC is better somehow. is the 24" measurement taken from stud to stud on both sides of the 2x6, or from one side of the 2x6 (measuring on one side of the wall)

does my question make sense? sorry, i see all the diagrams but none have measurements. I picked up the green glue and am looking for soundproofing insulation. thank you all.

Ps,
does spraying poly insulation on the inside of one wall help to seal leaks and add mass - I notice no one talks about this type of insulation at all.
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post #11 of 23 Old 11-15-2014, 04:39 PM - Thread Starter
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here's what I meant. 2x6 top plate I assume (so there is no overhang). 2x6 vertical studs on the terminal ends or rotated 2x4 to reduce resonating?
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post #12 of 23 Old 11-15-2014, 05:22 PM
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a staggerd stud wall is not decoupled from the ceiling joists unless you take steps to build it that way. Like IB3 clips and the wall built one inch short.
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post #13 of 23 Old 11-15-2014, 05:39 PM - Thread Starter
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hey, the famous, genius and ubiquitous Big has honored me with a comment!

Big, how would you do the ends of the wall? one end is on a concrete / block wall the other ends on another framed wall.


i love your work. thanks for all your contributions to the little guys here like me
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post #14 of 23 Old 11-15-2014, 05:48 PM
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the ends of the wall are no different than the top and bottom plates. Those are areas where there may be some coupling but the largest expanse of the wall is isolated. If you wanted to over engineer this You could put one 2x4 on one side at the end in the regular position and another 2x4 on the oppostite side starting at 2 inches from the end leaving a 1/2 inch gap You can cantilever that edge of the drywall that 2 inches. Particularly if it is a double 5/8 wall. On clip and channel systems often a channel is 6-8 inches from the corner and the drywall is just left hanging.
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post #15 of 23 Old 11-15-2014, 07:19 PM - Thread Starter
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excellent! problem is that the drywall would cantilever to the cement wall in the basement.
is the 16 (or24") OC measured from the first stud to the next staggered stud, or the next stud on the same side of the baseplate?
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post #16 of 23 Old 11-15-2014, 07:22 PM
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post #17 of 23 Old 11-15-2014, 07:24 PM
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Quote:
Originally Posted by DrBabs View Post
excellent! problem is that the drywall would cantilever to the cement wall in the basement.
what is on either side of this wall and how were you planning on sealing it when it reached the cement?
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post #18 of 23 Old 11-15-2014, 08:16 PM - Thread Starter
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the cement wall is the exterior wall (insulated cinder block basically) . i was planning on rotating the pressure treated studs 90 degrees so that the wall is sealed but the studs dont bridge to two pieces of sheetrock (or four, technically).
LIke in the diagram above. S'ok?
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post #19 of 23 Old 11-15-2014, 08:31 PM
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I can't imagine a construction design where it makes sense to dead end a wall to a concrete wall. If one side of the wall is a theater, all walls in a theater should be finished.
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post #20 of 23 Old 11-15-2014, 09:58 PM - Thread Starter
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ya, its unusual. the concrete wall is a cmu architectural block wall. 2 cell block with foam in one cell and rebar/mortar in the other cell. it gets a mastic coat, then a polymer coat, then a paint coat and its finished. no need to frame that wall. our entire basement and first floor has this.
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post #21 of 23 Old 11-16-2014, 04:13 AM
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do you have a theater plan you can post?
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post #22 of 23 Old 11-16-2014, 04:49 PM - Thread Starter
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its a napkin sketch. i dont know how to do the fancy computerized sketches I see here.
i finished the rough framing last night. its really intimidating to look at all your projects. I hate to cut corners but I have some financial limitations, so in order to compromise a little bit- im doing some of the work on my own.
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post #23 of 23 Old 11-16-2014, 05:23 PM
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I only use stained napkins, seriously I've never drawn a plan other than by hand , usually on graph paper.
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