Brian's data above shows:
Green Glue = STC 55 - QuietGlue (type B Test 1)=STC 50
So I simply subtracted 55 - 50 = 5
Am I doing that wrong, and how do you derive 10 from that equation?
Glide,
I know that there are (apparently) 2 different chemical compositions of Quiet Glue on the market. One reports numbers of 50 STC - the other has numbers reported at 45 STC.
I have no way of knowing how much of what type is sitting where - how much type of type A might be sitting in some wherehouse waiting to be shipped - but I would bet you a 10 dollars against your 1 that Quiet Zone didn't destroy tens or hgundreds of dollars of type A just because they introduced type B.
And seeing as they kept this all a secret - seeing as they didn't do a formal announcement of the introduction of their new improved Type II Quiet Glue - - we have no way of knowing which product we are actually purchasing.
Therefor if should err I choose to err on the side of the consumer.
As far as I am concerned - until it is proven to me that the type A product no longer exists - then I consider chances no better than 50/50 to come up with either product. And I will not even consider the higher numbers until I jhave that guarantee.
From my perspective they just don't exist......... and now I want to see actuall hard test data.
So - I check the link posted by Brian - - and what I see is this -
5/8” drywall + Engineered Damping Glue @ 2.5 tubes per 4’x8’ sheet + 5/8” drywall
Test Number: OL 06-0940
Green Glue Assembly II
5/8” Drywall Green Glue (2 tubes per 4’x8’ sheet)+ 5/8” Drywall
2x4 Wood Stud (24” OC)
R13 fiberglass insulation
5/8” drywall + Green Glue @ 2 tubes per 4’x8’ sheet + 5/8” drywall
Test Number: OL-05-1049
When I review the Tests performed at Orfield Laboratories, Inc. (The test numbers are (of course) links) I find that test OL 06-0940 reported an STC rating of 45 - and test OL-05-1049 reported an STC Rating of 55.
Without bothering to go to see the reports - if I simply drop down the page I see:
Quote:
Part 2
Wall Setup.........................STC............OITC
Engineered Damping Glue..... 45................33
Green Glue...........................55................39
As an aside (for just a moment) I also find it interesting that the Green Glue beat out the Quiet Glue by so great a margin when considering that they only used 80% of the product that was used for the Quiet Glue (2 tubes per sheet vrs 2 1/2 tubes per sheet).
Seeing as Brian has not posted the test results for the type B QG I can only wonder if it took 25% more product to come within those 5 dB... perhaps he'll comment on this.
Sincerely,
Rod
_________________ Rod Gervais
Acoustics Moderator Sometimes - late at night..... when the wind whips
through the trees........ and the moon shines bright in my
face......... I think deep thoughts.......... and my head hurts.
The type B test didn't use an excess of glue, its just a better QuietGlue than the first stuff we tested (both from tubes/fairly new).
Just to add a comment that never seems to get much attention, 25% coverage of Green Glue performs as well as the best of these, and is much cheaper. The performance margin is sizeable between these two products.
Green Glue at 25% coverage performing pretty well is something that I personally think is cool. That's getting towards 20 cents/sq foot for some definite improvements, and I just don't have any problems recommending that to people on a budget. We are planning some R&D work to outline the "best pattern" for such low coverage, and certainly this will begin to matter when so little area is covered in damping material. That should be interesting, I think.
Brian
_________________ All posted information copyright Brian Ravnaas
I'll go ahead and ask the budget conscious question...
If you have a small studio (Typical Garage/Bedroom) would you be best served to use green glue in the Control Room or in your Tracking Room?
e.g. If you had a choice of 25 percent coverage for all of the studio, or a 50 percent coverage for one room... which would give the best performance for the dollar?
Thanx,
Max
_________________ The insanity can be seen in bigger pix and greater detail at: http://www.dmmobile.com
"A committee is a cul-de-sac down which ideas are lured and then quietly strangled." -- Sir Barnett Cocks (1907 - 1989)
Rod Gervais Moderator
Joined: Jun 8, 2003
Posts: 3271
Location: Central Village, CT
Once a wall assemnbly is done it's done - and it works exactly the same in both directions.
for the 25% vrs 50% - you'll have to wait for Brian to answer......... I have no way of knowing.......
Rod
_________________ Rod Gervais
Acoustics Moderator Sometimes - late at night..... when the wind whips
through the trees........ and the moon shines bright in my
face......... I think deep thoughts.......... and my head hurts.
I'm not trying to be too FOS here (ror trying to hijack the thread) , but you KNOW how the questions will be asked... in all kinds of variations and 30 different ways of asking the same thing...
Just thought I'd try to head off a few and just cut right to the chase...
I'm just envisioning those folks trying to get the best bang for the buck... and the venerable questions of the cheapest way to do things vs. the best way to do things. As some builds are are shoestring budgets, I think it would be good to know if it would be best to use 25 percent coverage everywhere or if it make more sense to shoot for one room or the other to get 50 percent coverage.
_________________ The insanity can be seen in bigger pix and greater detail at: http://www.dmmobile.com
"A committee is a cul-de-sac down which ideas are lured and then quietly strangled." -- Sir Barnett Cocks (1907 - 1989)
avare Recording Org Pro Audio Forums
Joined: Feb 12, 2004
Posts: 335
Location: Hamilton, Ontario, Canada
or if it make more sense to shoot for one room or the other to get 50 percent coverage.
It all depends on how much isolation is wanted/needed between the various spaces. If someone has determined how much isolation is wanted and how much is affordable, it is the person's decision where they will compromise, or wait and get enough money to do it to their needs.
OK, lemme be stubborn then and beg some indulgence...
Take my build for instance... (last question is a pseudo real question)
My wall construction (as designed) will be:
2x6 stud
.75 MDF
.625 Gypsum
Green Glue
.625 Gypsum
(with finishes over that)
Is there ANY STC performance benefit to using 25-50% coverage between the MDF and gypsum and then 25-50% coverage between gypsum layers?? (As opposed to full coverage just between the two gypsum layers.)
Also, is there any significant TL gain to doing full coverage between the MDF and the 1st gypsum layer as well as between the two gypsum layers?
My guess is that in regards to the last (pseudo) question, that this is going to be a subjective answer. However, I'm asking from the premise that cost/db increase in TL is a definable value.
Thanx for humoring me...
Max
_________________ The insanity can be seen in bigger pix and greater detail at: http://www.dmmobile.com
"A committee is a cul-de-sac down which ideas are lured and then quietly strangled." -- Sir Barnett Cocks (1907 - 1989)
although I appreciate the support for Green Glue - the results supporting them without posting the actual reports from the testing lab - are as useless to me (and others) as when their competitors make their claims without the same reports.
you should either make the actual reports available for the public to review - or pull the data from your site - IMHO it actually makes the Green Glue company look bad - not good - to have this sort of data out there.
Sincerely,
Rod
_________________ Rod Gervais
Acoustics Moderator Sometimes - late at night..... when the wind whips
through the trees........ and the moon shines bright in my
face......... I think deep thoughts.......... and my head hurts.
although I appreciate the support for Green Glue - the results supporting them without posting the actual reports from the testing lab - are as useless to me (and others) as when their competitors make their claims without the same reports.
you should either make the actual reports available for the public to review - or pull the data from your site - IMHO it actually makes the Green Glue company look bad - not good - to have this sort of data out there.
Sincerely,
Rod
That info is available and I will make it accessible in the next couple days--no problem. I understand the need for the actual lab tests, but since the .PDF I linked has several tests in 1 it is simpler to just post the file I posted. And that way my site doesn't get jumbled up with 100 links on the left navigation bar.
Either way, I'll get that posted this week. Thanks!
Brien Recording Org Pro Audio Forums
Joined: Oct 04, 2008
Posts: 28
Location: Exit 4, Alabama
"I understand the need for the actual lab tests, but since the .PDF I linked has several tests in 1 it is simpler to just post the file I posted. And that way my site doesn't get jumbled up with 100 links on the left navigation bar."
Websites and link management are not even on my high priorty list when I am looking for data.
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