Currently my Knee-Walls in my house are drywall on the inside with paper faced (paper to inside) R11 FG bats between the framing. Nothing is on the exterior side of the Knee-Wall. I am planning on adding Tyveck and 2″ foam insulation. Should the Tyveck go on first then the foam insulation (easier way) or should I install the foam then put the Tyveck over the whole assembly. There is no weathering issue the Tyveck is being used as draft stopping which seem would be best if it went on first. Any thoughts would be appreciated. Jay
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Forget the tyvek...
Foam on
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Like hackinatit said, forget the tyvek. Tape all seams with foil tape. Seal all joints with flexy caulk. But most important are the joist bays beneath the kneewall. Make sure they have a draft stop to keep wind from blowing between the insulation and subfloor. Foam and caulk work good for this but you may have to cut open the subfloor behind the kneewall to get at it. Rich
Rich:
Thanks for the idea of plugging the joist space between the subfloor and lower level ceiling. I think this will help a lot. Jay
This can be huge. Good luck, gotta do everything we can to keep our $ outta the oil companies.