SoundProofing Next Theater - Green Glue & Quiet Rock - AVS Forum
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post #1 of 17 Old 04-25-2014, 11:50 AM - Thread Starter
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I'm pre-planning my next theater and I'm trying to determine the STC level of using a double wall, with 5/8" QuietRock, Green Glued to 5/8" DryWall on both sides, with a 6" air gap between the walls.

I've seen lots of "Green Glue vs QuietRock" threads, but not one combining both.

Also, is standard bat insulation the way to go, or high density fiberglass a better choice to stop bass from radiating out?

Why is there NO perfect equipment, only compromises?
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post #2 of 17 Old 04-25-2014, 11:56 AM
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Quote:
Originally Posted by SimpleTheater View Post

I've seen lots of "Green Glue vs QuietRock" threads, but not one combining both.

Thats because it doesn't make sense from an economic or a stop the bass perspective. You are giving up mass at 4x the cost. If you can apply Green Glue in the field there is no reason to have a factory do it for you and ship it cross country.
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post #3 of 17 Old 04-25-2014, 12:04 PM - Thread Starter
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Sorry, I don't follow. I'm talking about combining the two.

For example: A wall would be 5/8" drywall - Green Glue - Quiet Rock

Plus, from what I understand, Quiet Rock 545, has a layer of cement board sealed to gypsum, adding even more mass.

Why is there NO perfect equipment, only compromises?
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post #4 of 17 Old 04-25-2014, 12:19 PM
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post #5 of 17 Old 04-25-2014, 12:30 PM - Thread Starter
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According to the Green glue website, the "Best" is 3 tubes per 4'x8' sheet of drywall.
A case on Amazon is $192, so it will cost $48 per sheet of drywall.

Why is there NO perfect equipment, only compromises?
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post #6 of 17 Old 04-25-2014, 04:29 PM
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Get a price on quietrock and you may change your mind

JJ
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post #7 of 17 Old 04-25-2014, 06:42 PM
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Quote:
Originally Posted by SimpleTheater View Post

According to the Green glue website, the "Best" is 3 tubes per 4'x8' sheet of drywall.
A case on Amazon is $192, so it will cost $48 per sheet of drywall.

You buy 5 gallon pails from SoundproofingCompany.com apply it at the recommend 2 loads per sheet and it will run you about $20 a sheet for the green glue.
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post #8 of 17 Old 04-25-2014, 09:02 PM
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I bought 3 buckets and applied with a small notched trow. Much cheaper than buying the expensive glue gun they sell.
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post #9 of 17 Old 04-26-2014, 12:47 AM
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Originally Posted by Cksqurd View Post

I bought 3 buckets and applied with a small notched trow. Much cheaper than buying the expensive glue gun they sell.

Also I believe they say exactly to not do that. The glue-gun is not very expensive when buying GG. I think I would rather do the recommended and tested approach when spending the money on the product.

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post #10 of 17 Old 04-26-2014, 04:25 AM
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I think the gun is $29 when you buy the buckets.
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post #11 of 17 Old 04-28-2014, 03:37 AM - Thread Starter
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If more mass is better, can someone explain the examples in #6 where having two LESS layers of drywall improves STC substantially?
http://www.stcratings.com/assemblies.html

Why is there NO perfect equipment, only compromises?
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post #12 of 17 Old 04-28-2014, 10:29 AM
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Decoupling! With double walls you actually have 8” total between the two rooms walls. The walls are totally decoupled from each other and 1” space between them. On my billiard room side I just did 2 layers of 5/8” drywall on my theater side I attached the wall to the joist with IB-3 clips (decoupled) and have 19/32”OSB/GG/5/8”DW. So like the last example.
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post #13 of 17 Old 04-29-2014, 05:34 AM
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Quote:
Originally Posted by SimpleTheater View Post

If more mass is better, can someone explain the examples in #6 where having two LESS layers of drywall improves STC substantially?
http://www.stcratings.com/assemblies.html

Quote:
Originally Posted by cw5billwade View Post

Decoupling! With double walls you actually have 8” total between the two rooms walls. The walls are totally decoupled from each other and 1” space between them. On my billiard room side I just did 2 layers of 5/8” drywall on my theater side I attached the wall to the joist with IB-3 clips (decoupled) and have 19/32”OSB/GG/5/8”DW. So like the last example.
Just never do the first example in #6 that is tripple leaf
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post #14 of 17 Old 04-29-2014, 06:20 AM - Thread Starter
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This stuff isn't terribly priced @ $67/sheet for 4 x 10.
http://www.lowes.com/ProductDisplay?partNumber=89013-272-GB10011000&catalogId=10051&storeId=10151&langId=-1&productId=3045179

If these values are trustworthy, then the value is quite good.
http://www.nationalgypsum.com/products/..%5CFile%5C09%2029%2000-173.pdf

Why is there NO perfect equipment, only compromises?
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post #15 of 17 Old 04-29-2014, 06:37 AM
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STC may be quite good - I'll take your word for it. The catch is that STC doesn't capture the difference.

STC and virtually every other tested parameter of sound transmission does not measure low bass. The facilities that would be required to measure performance at that low a frequency simply are not available. (I don't think I've seen results below 125Hz)

The only way to meaningfully improve transmission losses for low bass is to push down the natural resonant frequency of the wall. Mass is the way to do that.
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post #16 of 17 Old 04-29-2014, 07:09 AM
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Quote:
Originally Posted by SimpleTheater View Post

This stuff isn't terribly priced @ $67/sheet for 4 x 10.
http://www.lowes.com/ProductDisplay?partNumber=89013-272-GB10011000&catalogId=10051&storeId=10151&langId=-1&productId=3045179

If these values are trustworthy, then the value is quite good.
http://www.nationalgypsum.com/products/..%5CFile%5C09%2029%2000-173.pdf


That would quite get expensive fast compared to a couple of type-x 5/8 for a fraction of the cost and some pales of GG. I think i have almost 80 12ft sheets of drywall in my theater and at your plan that would be near 5000 in materials. I can tell you I didn't pay anywhere near that for my type-x and GG and likely have a better system.

If there were better products, better ways to do it , cheaper options- people would be doing it.


You also have to factor in what the pure mass is worth as STC isn't telling you how it will do at all with LFE.

JJ
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post #17 of 17 Old 04-30-2014, 06:41 AM
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Quote:
Originally Posted by SimpleTheater View Post

This stuff isn't terribly priced @ $67/sheet for 4 x 10.
http://www.lowes.com/ProductDisplay?partNumber=89013-272-GB10011000&catalogId=10051&storeId=10151&langId=-1&productId=3045179

If these values are trustworthy, then the value is quite good.
http://www.nationalgypsum.com/products/..%5CFile%5C09%2029%2000-173.pdf

Quote:
Originally Posted by jjslegacy View Post

That would quite get expensive fast compared to a couple of type-x 5/8 for a fraction of the cost and some pales of GG. I think i have almost 80 12ft sheets of drywall in my theater and at your plan that would be near 5000 in materials. I can tell you I didn't pay anywhere near that for my type-x and GG and likely have a better system.

If there were better products, better ways to do it , cheaper options- people would be doing it.


You also have to factor in what the pure mass is worth as STC isn't telling you how it will do at all with LFE.
What he said this is $12.25 per sheet so two layers would be 24.50 and then the GG now you have 1 2/8" mass. Much better. Why is mold protection needed?
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