When is room treatment needed - Page 9 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #81 of 189 Old 03-13-11, 09:58 AM
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Or you can use the same as above but instead of 2 sheets you can omit that for 1 1/2" sheet of quite rock which is equal to 8 1/2" sheets of standard drywall and 12" of Safe and Sound.
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post #82 of 189 Old 03-13-11, 10:11 AM
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Re: When is room treatment needed

I would quadruple check those specs. No way is 1.5" QuietRock going to have that kind of performance - not to mention that it's outrageously expensive for the 1.5" and you'll need at least 3 guys to wrangle it around.

It's not a bad product, don't get me wrong, but the DD and GG is WAY less expensive and will give you 95% of the performance.

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post #83 of 189 Old 03-13-11, 10:18 AM
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I agree that it is expensive but it is only 1/2" thick not 1 1/2" it weights the same as a regular 1/2" sheet it is 2 1/4" sheet laminated together with a product similar to green glue we use it all the time so does Paradigm at there lab and also Mike Holmes he stated the specs on his show awhile ago. In our area we supply install tape mud prime and paint for $285.00 a sheet and we are told that we are on average $20-30 less a sheet then most of the other contractors.

Last edited by Tooley; 03-13-11 at 10:24 AM.
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post #84 of 189 Old 03-13-11, 10:45 AM
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Re: When is room treatment needed

Sorry. Misread your post and thought you were referring to the 1.5".

I'll still stick with the 2 layers of 1/2" and green glue for better performance at the cost of 1/2" of space. I'm not saying it's not a good product at all. Looking at the quiet rock performance data for the 1/2", they show at TL of 17 at 100Hz, 27 at 125, and 33 at 160. GG plus 2 layers 1/2" shows 22 at 100Hz, 30 at 125Hz, and 35 at 160hz. GG also shows 21 at 80hz.

Overall STC
GG assembly - 54
QR assembly - 49

Keep in mind that STC is an average and not an end all. Where the GG assembly shines is at the low end where it's more difficult to stop sound. That's a function of the additional mass of 2 layers of 1/2" vs 2 layers of 1/4".

That said, even at higher frequencies, the GG assembly is superior. At 5kHz - the GG assembly has a TL of 70, the QR assembly has a TL of 58.

All of these data points come directly from the respective companies' test result documentation from their own web sites.


For your own perusal

http://www.greengluecompany.com/imag...823_Report.pdf

http://www.quietrock.com/documentati...-startdown/94/

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post #85 of 189 Old 03-13-11, 10:59 AM
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bpape are you located in the US or Canada I am in Canada I can not get green glue here I called a few places that are suppose to carry it but they told me it is very hard to get here for some reason it would be alot more cost effective like you stated.
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post #86 of 189 Old 03-13-11, 11:18 AM
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Re: When is room treatment needed

Contact Ted at The Soundproofing Store. He has good pricing and I know he ships to Canada at a reasonable price.

If you can get the QuietRock locally, I understand the situation certainly. Just pointing out the facts in specs and performance.

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post #87 of 189 Old 03-13-11, 11:30 AM
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Thanks for the contact.
Great talk.
Talk soon
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post #88 of 189 Old 03-13-11, 01:19 PM Thread Starter
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Re: When is room treatment needed

Quote:
bpape wrote: View Post
You can cut the spacing a little. The rockwool between drywall layers isn't going to do much at all. Green Glue would be better by a long shot.

Assuming Green Glue.

Wall
1/2" space
2x4 stud(3.5")
2 layers 1/2" drywall

Total space - 5". That leaves you only using 6" total with 1" mineral wool inside the room or 7" total with 2" inside the room.

Bryan
So what you are saying is instead of putting the rockwool on the existing wall just start off with space then studwall, then rockwool last with fabric covering?

The only problem is I think I need a solid wall to put my fixed pj screen onto?

Would it be just as effective in my room to have the rockwool going on the wall all around the outside of the screen and put in corner bass traps?

Kind Regards
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post #89 of 189 Old 03-14-11, 07:18 AM
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Re: When is room treatment needed

What I'm saying is build a standard stud wall, insulate it with regular fluffy insulation, and drywall the surface. Then mount the screen on that wall. Cover the remaining wall with mineral wool or fiberglass (higher density) and cover with black cloth.

That will give you the absorption you require, the isolation you want, and the 2" absorption with cloth will actually 'recess' the screen back a bit forming a nice looking shadow box effect.

You'll still need the corner absorption.


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post #90 of 189 Old 03-14-11, 08:34 AM
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Re: When is room treatment needed

Wouldn't that wall in front of a wall result in a triple leaf?


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