Already have 1/2 drywall on 3 of my walls. Drawbacks of just adding GG + 5/8 on top? - AVS Forum
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post #1 of 5 Old 02-25-2012, 02:28 PM - Thread Starter
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The basement of my house was already finished when I bought it. I want to convert an existing space that's ~17.5 x 21.5 into a theater. Preliminary layout below.

Existing room has 1/2 drywall on three walls (the fourth side is open to the rest of the finished basement) and a drop ceiling. It would obviously be a ton of work and mess to rip down the existing drywall to start from scratch putting up double 5/8 drywall. Any major drawbacks to putting new 5/8 drywall over the existing 1/2 other than an obviously proportional reduction in mass? Can I use GG on already painted drywall?

I do plan to put double 5/8 on the ceiling with whisper clips/hat channel. I'm most interested in sound isolation for the floor above. I do plan to leave a good chunk of the "back" wall open to the rest of the basement. Will the leakage to the floor above be so great through this back wall as to make it pointless to bother with double drywall plus green glue on the rest?

Thanks.
LL

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post #2 of 5 Old 02-25-2012, 03:31 PM
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You are wasting your money with the open backwall. The decoupling of the ceiling will help with impact noise.

GG can be applied over paint.

Is closing off the room an option and going with four seats as a single row, an option?
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post #3 of 5 Old 02-25-2012, 04:26 PM
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^^ +1

You will either need to close off that opening or soundproof the adjacent room as well to reduce noise.

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post #4 of 5 Old 02-25-2012, 05:41 PM - Thread Starter
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For aesthetic reasons as well as our planned use case, I'd rather sacrifice sound isolation than close the back of the "theater" (I probably don't deserve to use that term with the blasphemy I'm perpetrating). Plus I'll save money on clips, GG, and extra drywall.

I am interested in why you ask about 4 seats as a single row. That configuration is certainly available. With the width of the screen, the outboard seats would be partially outside the edge of the screen - hence the plan to angle them back in.

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post #5 of 5 Old 02-26-2012, 11:22 AM
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Wants versus needs.

Seating outside screen width was pretty common place when limited light output kept screens smaller then today.
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