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Discussion Starter · #1 ·
Single layer is all you need not double as with normal dry wall for soundproofing, correct?
 

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You will desperately want the mass due to the bass. Double or triple 5/8" drywall from Home Depot, etc. Excellent mass, easy to work with and cheap at $7 a sheet.


More massive, less expensive.
 

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Discussion Starter · #4 ·

Quote:
Originally Posted by Ted White /forum/post/20817445


You will desperately want the mass due to the bass. Double or triple 5/8" drywall from Home Depot, etc. Excellent mass, easy to work with and cheap at $7 a sheet.


More massive, less expensive.

so you would suggest a double layer of QuietRock


Does the manufacturer suggest a single or double layer?
 

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I'm suggesting to start with plain old 5/8" drywall that costs $7. Not a specialized drywall product.
 

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Discussion Starter · #6 ·

Quote:
Originally Posted by Ted White /forum/post/20817680


I'm suggesting to start with plain old 5/8" drywall that costs $7. Not a specialized drywall product.

so you recommend the QuietRock be added to regular drywall




is that what the manufacturer suggests?
 

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Quote:
Originally Posted by eljr /forum/post/0



so you recommend the QuietRock be added to regular drywall



is that what the manufacturer suggests?

No. What he's saying is to use fire rated drywall instead of not in addition to Quietrock.
 

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Discussion Starter · #8 ·

Quote:
Originally Posted by ctviggen /forum/post/20818097


No. What he's saying is to use fire rated drywall instead of not in addition to Quietrock.

Thank's for clarifying Ted's responses.


My question remains, "Single layer "Quietrock" is all you need not double as with normal dry wall for soundproofing, correct?"
 

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Quote:
Originally Posted by eljr /forum/post/20818375


Thank's for clarifying Ted's responses.


My question remains, "Single layer "Quietrock" is all you need not double as with normal dry wall for soundproofing, correct?"

The more damped layers the better. The more mass the better. Quietrock is two thin layers of drywall with one damping layer.... how good do you want your soundproofing to be?


I used 1/2" OSB + GG + 5/8" DW + GG + 5/8" DW and I'm very happy with the results. A friend of mine used one layer of Quietrock throughout his condo and the results were mediocre although clearly better than regular drywall.
 

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Discussion Starter · #10 ·
Thanks Moggie. That is good info and about what I thought.


I am still wondering what the manufacturer suggests. I called but they were closed.


Clearly better than 2 layers of drywall you think?
 

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Quote:
Originally Posted by eljr /forum/post/20817190


Single layer is all you need not double as with normal dry wall for soundproofing, correct?

Depends on how much soundproofing you want.

I'm designing a hospital and between certain patient rooms, we're using 5/8" QuietRock in lieu of double layers of 5/8" type X gyp. The more expensive quietrock is a whole lot cheaper than extra square feet in a hospital...


A single layer of QR 545 on each side of a normal stud wall (no RC, no decoupled studs, no staggering, just gyp screwed to each side of the stud) will give you about a STC of 60.

A single layer of QR 525 on each side of the same wall (not 545) will give you a STC of about 55.


Two layers of 5/8" gyp with green glue on each side of the same wall will give you a STC of 56.


Mass? The 525 is 5/8" thick. Two layers of 5/8" gyp is a little over double (thickness of GG) - between 10/8" and 21/16". The 545 is 11/8" thick.


Cost?

QR 525 is ~$106 ($3.3125)

QR 545 is ~$245 ($7.656/sf)

Gyp is $7/sheet ($0.21875/sf)

GG is ~$230/5g ($0.63/sf)


2 layers of gyp + GG would be ~$1.0675/sf


CN: QuietRock 525 will give you a similar STC that double 5/8" type X + GG at a $2/sf premium and the expense of mass dampening.
 

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The big thing is weight (mass). The maker of quietrock says you can do just one layer of their drywall...obviously, more is better since more gives you more weight to the wall.


The weight is needed to help it absorb sound instead of transmitting it. Of course, not all materials are good at this, but we are limiting our discussion to drywall.


Quietrock is certainly better than just using a single sheet of drywall. There is no doubt here. Is the price worth what you get from it? That depends on the size of your wallet, to be honest. For me, it was not.


Quietrock (for the most part) is simply two very thin layers of drywall with an acoustic absorbing paste between them. If all you have room for (due to space limitations) is one layer of drywall and no other soundproofing methods, it is a viable solution. However, if you can support losing more living space, it would be better to go with two layers of 1/2" drywall with some GreenGlue (an acoustic paste) between them. Even better would be two layers of 5/8" drywall. I did not have the ability to keep losing more and more people space, so I am using two layers of 1/2" drywall.


Why is the two layers of regular drywall better than one layer of Quietrock, even though Quietrock is also actually two layers of drywall? It is due to the weight of it...the mass involved. The Quietrock is as thin as one layer of drywall, so it only has the mass of one layer of drywall. It is better than just a normal layer of drywall due to the acoustic paste between the two thin layers, but that is is.



To REALLY sound isolate, you would use clips and furring channel, with three layers of 5/8" drywall and acoustic paste between each layer. That would give you some VERY good isolation...and it would be quite expensive. A good balance between cost and effect can be reached.


I called the guys at www.SoundProofingCompany.com and talked to one of their specialists (we started on the IM on their website). I talked room size, room location, room purpose, and budget available. He asked good questions, like where was I most interested in preventing the spread of noice (the room above is a hardwood floor sitting room - definately have to be sound isolated with that, but one of the walls goes to the outside world and is already very nicely soundproofed). I could not afford two tubes of GreenGlue per sheet, but he explained that one tube will give me 70% (or 80%, cannot remember now) of the results that two tubes will give. Cutting that cost in half met my budget.



What you can do (if you have enough cash), is to replace the layers of drywall with Quietrock, so you get the benefits of the Quietrock along with the mass you need as well.
 

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Discussion Starter · #13 ·
great help Scorpio and sage, thanks


do you guys have a site you can recommend for doors and windows?

I'll have heavy drapes in front of the glass doors and windows, what do I need to look for in windows and doors? (French doors)
 

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Pre-damped drywall products can be a great thing in certain instances. Quiet Rock, Comfort Guard, Supress, SoundBreak, etc all have a role in construction. Depends on your particular needs.


Keep in mind:


A single layer of drywall solution will have a much larger risk of seal failure. Double sheets gives much better seals.


STC does not measure low frequency bass so comparing solutions with STC as the sole metric renders a highly incomplete picture. This is why using low cost, readily available standard drywall is s great; it's massive and getting as much mass on the wall, floor or ceiling is generally a good starting point.


As mentioned, the great mass will perform better for our needs if damped, and installed to decoupled framing.


A drywall job will typically have 10% waste. Factor that in with your cost of board.


The GG costs listed above are about 20% high.


As with anything else, you should always do the math first before making any decisions.
 

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Discussion Starter · #15 ·
Thank you Ted
 
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