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Old 07-07-2007, 09:46 AM   #1
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attic knee wall insulation improvments


I was told I should add some sheathing to the knee wall in my attic crawl space. The Insulation already has a vapor barrier. How would adding sheathing help? what would I use. wood? ridged foam? tyvek house wrap?

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Old 07-07-2007, 10:04 AM   #2
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attic knee wall insulation improvments


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Originally Posted by truebaca View Post
I was told I should add some sheathing to the knee wall in my attic crawl space. The Insulation already has a vapor barrier. How would adding sheathing help?
Your crawl space area, in an attic, is part of the "air flow chamber" that allows cold air or hot moist air to flow out of your home's attic. Outside air enters in from soffit vents and travels up and out through the ridge vent. Because of this, you have free movement of unconditioned air (unheated, moist, hot or cold air-movement), that you want to "seal off" from any "conditioned" (finished off) living area and it's insulation that protects that area.

So, the area you want to seal up, is located on the other side of that knee wall.

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Originally Posted by truebaca View Post
what would I use. wood? ridged foam? tyvek house wrap?
The best way to "seal" the backside of that knee wall (facing the crawl space) is to use rigid foam board and "spray foam" at any of the foam-board seams or transition points.

See this link, it explains everything along with great illustrations:

http://www.ibacos.com/pubs/FactSheet-KneeWalls.pdf


Last edited by AtlanticWBConst.; 07-07-2007 at 10:08 AM.
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