Fiberglass insulation questions... - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 4 Old 07-07-2004, 12:59 PM - Thread Starter
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Ok I've decided to use Fiberglass batts insulation in my wall because of the NRC-CNRC study . But this document referer to 2 types of Fiberglass Batts Call G1 and G2 where G2 seem more dense. but thru some analysis of this document, G1 seem to give better soundproofing partiulary in the 50-100 Hz region

Now If I look at Owens Corning Firberglass material for 2X4 stud wall, they got 3 types : R11, R13 and R15. I understand that this R rating reffer to heat isolation but does it meen is is also more dense??

now I am trying to match those G1 and G2 with the R11, R13 and R15... any idea ??

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post #2 of 4 Old 07-08-2004, 01:09 PM - Thread Starter
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*bump

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post #3 of 4 Old 07-08-2004, 02:01 PM
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http://www.cmhc.ca/publications/en/r...ch/02-108.html
says
Quote:
Generally, at low frequencies, the increase in the transmission loss of a partition obtained by adding a sound absorptive material inside its cavity is equivalent regardless of the material used. Above 250 Hz, mineral fiber and blown cellulose give the best results; mineral fiber insulation provides slightly better transmission losses than glass fiber, especially around the critical frequency. Also, in the case of glass fiber, a greater transmission loss can be achieved by using denser batts.
on page 64 of
http://irc.nrc-cnrc.gc.ca/fulltext/ir693/ir693.pdf
it shows the airflow resistivity of G1 as 4300 mks rayls/m, which seems fairly low to me so it might be fluffy fiberglass. The thickness in mm can be used to tell if it's R19 or so on.

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post #4 of 4 Old 07-08-2004, 02:31 PM - Thread Starter
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Well BasementBob, your are trully my savior in all my post!

thanks again!

So maybe I shoud just ask you What do you think is better insulation to put between the stud?

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