Gipsum Ceiling (1 Viewer)

[john.michael]

I am building my new dedicated home theater and I will have to put a gypsum "false ceiling" about 3" below the real brick and concrete thing. I have two questions:

1 - Will it reverberate? I am sort of worried that it will act like a drum.

2 - In order to minimize sound leakage to the upstairs neighbor, should I put Sonex between the real ceiling and the gypsum (or over the gypsum it self)?

Thanks for your inputs.

JM

 

[Bryan Pape]

To kill many birds with one stone....

To help stop transmission requires mass and more mass. You don't have a lot of space to decouple anything so mass is your best friend.

Stuff the space above the gypsum with fiberglass or rockwool and put up a DOUBLE layer of drywall. The extra mass and stiffness will help block sound leakage and will also help to keep it from resonating as much. It will always resonate to a certain extent, it's just a matter of how much and at what frequencies.

 

[john.michael]

Just plain rockwool? BTW, is it flamable?

 

[john.michael]

OK, just made some research and found out that it is not flamable. Thanks.

 

[john.michael]

Bryan,

Just found a local (in Brazil) supplier of rockwool. Thank you very much for your input.

JM

 

[Bryan Pape]

Glad you found some. Hope it works out well for you.