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ABS 12-11-2011 10:19 AM

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.
Thanks

joecaption 12-11-2011 10:24 AM

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

Hates my roof 12-11-2011 10:32 AM

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.

gregzoll 12-11-2011 11:41 AM

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.

Windows on Wash 12-11-2011 12:16 PM

Quote:

Originally Posted by gregzoll (Post 791201)
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.

gregzoll 12-11-2011 12:23 PM

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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