Author Topic: R-13 vs R-30 fibergalass insulation for sound attenuation...  (Read 16039 times)

rharries

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R-13 vs R-30 fibergalass insulation for sound attenuation...
« on: December 11, 2007, 03:20:28 AM »
I am remodeling my house (1950's) and drywall is scheduled for installationin 48 hours.  I was planning on installing R-30 fiberglass insulation to attenuate sound transmission between the upper and lower levels.  Will R-13 work as well?

for the record, floor joists between levels are 2x10 at 12-16" oc.

I wish i had used a bulldozer and started fresh, but i didn't..

-rharries

johnbergstromslc

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Re: R-13 vs R-30 fibergalass insulation for sound attenuation...
« Reply #1 on: December 11, 2007, 02:46:36 PM »
The best thing to do is to fill the cavity completely.  But in a floor cavity, R-19 will probably get you decent absorbtion.  R-13 is definitely not enough...

joel

  • Guest
Re: R-13 vs R-30 fibergalass insulation for sound attenuation...
« Reply #2 on: September 26, 2008, 05:05:40 PM »
R13 is definitely not enough for a floor cavity.  Most effective would be the R30.  R19 is most often used inside ceiling cavities, not floors.  Bonded cotton insulation has the highest sound absorption - 1.15 NRC - and the R19 also gives close to 20 STC by itself.  R30 is higher STC due to its increased density.

 

anything