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adding another layer of drywall + green glue = expectations?
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localhost127
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#1
20th November 2010
Old 20th November 2010
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adding another layer of drywall + green glue = expectations?

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21st November 2010
Old 21st November 2010
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Some ppl will probably mention about 2 leaf vs 3 leaf wall's .
By the advice given in some threads , more layers does not necessarily mean more isolation. , if i understand correct.

I,ll be hanging about to watch for info regarding adding another drywall onto an existing wall .



edit....Ooops , you talikng about adding extra Gypsum, not an complete wall with a gap and rockwool...sorry
localhost127
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21st November 2010
Old 21st November 2010
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22nd November 2010
Old 22nd November 2010
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Quote:
Originally Posted by localhost127 View Post
i would just screw the new layer of drywall through the existing 2 layers and into the metal stud --
Well for the sake of posting..
I cant see no harm adding another layer of Gypsum .


BUt dont take my word on anything regarding isolation , there might be better ways to isolate
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22nd November 2010
Old 22nd November 2010
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Assuming the sound is transmitting through the wall, more mass and green glue will help significantly. If the sound is getting through in another way, then maybe not so much.
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22nd November 2010
Old 22nd November 2010
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What are the construction methods of the floor and ceiling?
localhost127
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23rd November 2010
Old 23rd November 2010
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23rd November 2010
Old 23rd November 2010
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What floor are you on?

Just wondering if it's reasonable to expect concrete under your hardwoods.


Beautiful place by the way!
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localhost127
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23rd November 2010
Old 23rd November 2010
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23rd November 2010
Old 23rd November 2010
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Quote:
Originally Posted by jwl View Post
Assuming the sound is transmitting through the wall, more mass and green glue will help significantly. If the sound is getting through in another way, then maybe not so much.
Exactly. That's why this is a bit of a crap shoot.
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23rd November 2010
Old 23rd November 2010
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Is this actually an apartment - or is it a rented condo - this also makes a difference in what you can or cannot do...........
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23rd November 2010
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Even with GG you don't gain much in adding another layer of drywall

You DO gain by adding an air cavity with rockwool and 2 or 3 layers of drywall with GG in between
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24th November 2010
Old 24th November 2010
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You have two options.

1) Tear down your side of the wall. Build a second set of studs and then drywall over the second set. Insulate the wall of course.

2) Add as many layers with Green Glue in between as you can. There is no reason to stop at one layer. You can have all of the layers of 3/8 inch or thinner if you can find it with Green glue in between each layer that you want and still benefit. Just don't put more than 3 quarts per sheet in any layer. Adding two layers of 1/2 inch with two layers of Green glue will give you more benefit than 1 layer of 1 inch with one layer of Green glue. Of course at some point the cost benefit ratio will go down dramatically.

Remember only have one air cavity at most. Air cavities increase resonating frequency weak points in your sound protection.
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