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-   -   airblocks underneath knee walls (http://www.diychatroom.com/f19/airblocks-underneath-knee-walls-33169/)

bob with 4 dormers 12-04-2008 05:38 PM

airblocks underneath knee walls
 
Hello. I have a cape style home with knee walls. I have heard that I should block the airflow in the joist cavity directly beneath the knee wall. If there is insulation batting there already, should I cut the batts, fit the block, then start the batts over again? It seems I should not just squish the batts to install this air block. And, is carefully cut and calked bead board good for this purpose? Thank you.

DUDE! 12-05-2008 04:19 PM

okay, so I had to google knee walls, my sister's house has them but wasn't sure, anyway, here is nice piece on it,, hope it helps you
http://www.hgtvpro.com/hpro/bp_frami...243849,00.html

bob with 4 dormers 12-05-2008 04:42 PM

dude thanks

Vermont1 02-15-2009 12:11 PM

Answer to your question
 
Bob, did you ever get an answer to your question? The site that was mentioned was really good, but didn't address the question on how to block the floor cavity below the knee wall. I have the exact same question.
THanks

Ron6519 02-15-2009 04:21 PM

Quote:

Originally Posted by Vermont1 (Post 230682)
Bob, did you ever get an answer to your question? The site that was mentioned was really good, but didn't address the question on how to block the floor cavity below the knee wall. I have the exact same question.
THanks

You can use rigid foam insulation and cut it so it's tight to the joists. If it's too loose, spray in some foam insulation from the cans to seal the edges.
Ron

Scuba_Dave 02-15-2009 04:31 PM

My area behind the knee wall was actually insulated & rocked before the knee wall went up. Then the knee wall was also insulated w/R19
So equiv of R38 to R44 insulation. The knee wall area stays warmer, but that heat is kept away from the roofing
My knee wall area is also used for storage

Vermont1 02-17-2009 10:52 AM

followup question
 
Quote:

Originally Posted by Ron6519 (Post 230796)
You can use rigid foam insulation and cut it so it's tight to the joists. If it's too loose, spray in some foam insulation from the cans to seal the edges.
Ron

Ron, I have a subfloor layed behind my kneewall that has insullation running along the floor joists. Just want to make sure I understand what I need to do. I think what your saying is that I need rip up enough of the subfloor behind the knee wall to insert rigid foam insulation. That means I will have to also cut part of the already existing insullation that runs the length of the joists to put the rigid foam in.


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