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Old 11-10-2010, 03:51 PM   #1
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Insulation question


Here's the deal, I am redoing part of my bathroom including the outside wall, I need 4 pieces of insulation for that 2X4 framed outside wall.

I have a bunch of left over R-19 6" thick insulation.

My question is if it's ok to shove the R-19 into that wall? I know that smooshing down fiberglass insulation will hurt it's R-value, but will it lower the R-19 to less than R-11?

Would it really be worth it to buy an entire pack of R-11 over just using the R-19 that I currently have?

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Old 11-10-2010, 04:06 PM   #2
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Insulation question


r-13 is the standard for 2x4, the older insulation that was r11 isn't up to the same standard as what's sold today. if you really wanted to a mini roll of r13 is $8 at home depot. me? i'd shove your r19 in there. by compressing it you will loose some of the r value but i'd guess you would fall somewhere in the r13-15 range by doing so.

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Old 11-10-2010, 05:14 PM   #3
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Insulation question


You nailed it at R-13: http://saveenergy.owenscorning.com/2...nd_your_2.html

Gary
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Old 11-10-2010, 05:16 PM   #4
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Insulation question


Quote:
Originally Posted by racebum View Post
r-13 is the standard for 2x4, the older insulation that was r11 isn't up to the same standard as what's sold today.
I've used plenty of R-11 today, you can buy it from any of the manufacturers, it's unfaced batts. The reason I want to use unfaced batts is because I will be using plastic behind the cement board in the shower and I don't want to have 2 vapor barriers. I see a lot of R-11 used in commercial jobsites in the 3 5/8" interior walls.
Quote:
if you really wanted to a mini roll of r13 is $8 at home depot. me? i'd shove your r19 in there. by compressing it you will loose some of the r value but i'd guess you would fall somewhere in the r13-15 range by doing so.
Good to hear, thanks
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Old 11-10-2010, 05:16 PM   #5
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Insulation question


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Originally Posted by GBR in WA View Post
Great, thanks!
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