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Old 12-11-2011, 10:19 AM   #1
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R 30 Insulation in Walls


Can I install 91/2" thick R30 insulation in my 2x6 studded outside walls or will my R factor be reduced too much? We live on a very windy ridge and feel that R19 might not be enough.
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Old 12-11-2011, 10:24 AM   #2
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R 30 Insulation in Walls


Never put to thick an insulation in the wall. If it's compressed it's usless.

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Old 12-11-2011, 10:32 AM   #3
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R 30 Insulation in Walls


Dont compress fiberglass batts to fit a cavity shallower than what the batt is designed for. No matter how much fiberglasss is compressed, it will not stop draftiness - been there, done that, had to start all over again. You need to stop the airleaks in those walls. Seal up all the stud bays with good quality caulk - wherever two pieces of wood meet. That still might not be enough - air is like water in that it will find a way through. If you block one crack, it will find another. All cracks need to be sealed thoroughly in pretty much the whole structure in order to make a difference. And dont forget about those plumbing/electrical holes and chaseways.
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Old 12-11-2011, 11:41 AM   #4
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R 30 Insulation in Walls


I would use Roxwool, or Wet application dense pack in the wall space, vs. conventional insulation batts. Reason being, is that air moves too much through regular batts, along with noise.
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Old 12-11-2011, 12:16 PM   #5
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R 30 Insulation in Walls


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Originally Posted by gregzoll View Post
I would use Roxwool, or Wet application dense pack in the wall space, vs. conventional insulation batts. Reason being, is that air moves too much through regular batts, along with noise.
+1

Batts are largely crap and if you get the high density stuff, they are expensive.
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Old 12-11-2011, 12:23 PM   #6
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R 30 Insulation in Walls


I only used them in my bathroom when we remodeled, due to I had a bag left, when we went around and did the rim joists in the basement. I wanted the house to still breathe a little, but not airtight downstairs, so that is why I used Kraft faced R-13.

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