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Old 12-13-2010, 07:35 PM   #1
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Insulating Knee wall attic space


I have a bonus room over a garage. The room has a knee wall. Under the knee wall side is a doubled wood beam roughly 12" wide, that runs the legnth of the room and a little beyond. I have spray foamed where the garage ceiling below, meets that beam. I have r-30 on the wall as well. I know I'm getting wind washing because the insulation is dirty in the attic space. The bonus room has a draft on the knee wall side. My question is; Will adding Tyvek help in stopping the air flow into the insulation, and will that help keep out the draft? Also, can I place it snug up to the insulation?
Thanks in advance.

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Old 12-13-2010, 09:06 PM   #2
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Insulating Knee wall attic space


Yes, Tyvek is acceptable to prevent wind-washing. Be sure to air seal under and over the wall, to keep the wind out of there, snug up to the baffles running on the slope ceiling. The h.w. should go snug against the insulation to prevent convective loops inherent to all low density f.g.blown and batts. http://www.simplesavings.coop/simple...ee%20walls.pdf
Foam board (unfaced) also works though if attic is for storage or inter-connected, it has to be covered- 4.2.1.2: http://building.dow.com/ee/pdf/ESR-2142.pdf

Gary

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Old 12-14-2010, 11:00 PM   #3
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Insulating Knee wall attic space


Quote:
Originally Posted by GBR in WA View Post
Yes, Tyvek is acceptable to prevent wind-washing. Be sure to air seal under and over the wall, to keep the wind out of there, snug up to the baffles running on the slope ceiling. The h.w. should go snug against the insulation to prevent convective loops inherent to all low density f.g.blown and batts. http://www.simplesavings.coop/simple...ee%20walls.pdf
Foam board (unfaced) also works though if attic is for storage or inter-connected, it has to be covered- 4.2.1.2: http://building.dow.com/ee/pdf/ESR-2142.pdf

Gary
Thanks for the reply. You say Tyvek is acceptable, which leads me to believe that there is something better. What would be the best choice?

Last edited by Bloodta; 12-15-2010 at 07:50 PM.
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Old 12-14-2010, 11:48 PM   #4
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Insulating Knee wall attic space


Furr the wall, add cellulose and foam board, ada the drywall: http://www.buildingscience.com/docum...wall-approach/

http://www.buildingscience.com/docum...tlanta-profile

http://www.ornl.gov/cgi-bin/cgiwrap?...le/ins_fact.pl

Gary
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