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Perimeter Bulkhead In Theatre Room Worth It?

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8 hours ago, Primare Knob said:

The only function of the green glue, beside sticking things together is to become a flexible barrier.

Kinetic energy will hid the gyprock and the flexible green glue will absorb that energy and turn it into heat. Hence the low frequency absorption of the green glue.

If you use screws as well, the gyprock will be fixed to the plywood and you loose the flexibility the green is suppose to provide, making the green glue pointless.

As already noted, green glue isnt a construction adhesive, in fact its not a  glue at all. It wont hold a sheet of whatever to whatever, especially on a ceiling. Refer the install guide

 

https://www.greengluecompany.com/sites/imdf.greengluecompany.com/files/files_resource_library/green-glue-noiseproofing-compound-installation-guide-o-1549.pdf

 

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As already noted, green glue isnt a construction adhesive, in fact its not a  glue at all. It wont hold a sheet of whatever to whatever, especially on a ceiling. Refer the install guide
 
https://www.greengluecompany.com/sites/imdf.greengluecompany.com/files/files_resource_library/green-glue-noiseproofing-compound-installation-guide-o-1549.pdf
 
There must be enough flex in the material in between the studs apparently to still be effective.

If the manual says to use screws, you have to use screws. It still doesn't make sense as it limits the function of the glue.

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30 minutes ago, Primare Knob said:

 glue.

As I say, its not glue. It has no adhesive properties. Its just a liquid visco elastic membrane. Still very effective. You need to be careful not to over torque the screws 

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Screws need to be used for fastening/fixing ... as others have said, even the green glue manual says to do it.  

The plywood makes it simple to not have to remember where your channel (ideally) or studs (less ideal) are, because without ply they’re the only things you can securely fix to (a layer of gyprock screwed to layer of gryprock ... not sure good idea) 

I would worry extensively about someone doing a double layer ceiling without screwing the second layer to

something that can hold it.

All I can speak of is the amazing soundproofing results from building it this way myself ... albeit following the system as recommended by professional room designers.

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