Tape exterior XPS insulation and housewrap?
Long time follower first time poster.. I have learned so much from this site and appreciate all the knowledge you people share.
We are building a tight house in zone 6 Ontario. The wall stack from inside is as follows:
2×3 uninsulated service wall
2×8 stud wall filled with dense pack cellulose
Cross bracing for lateral strength
2″ XPS on exterior
Furring Strips (airgap)
Having the Membrain will help wall dry to the inside.. but wondering on taped XPS on outside, not being so permeable, will trap any moisture from drying to exterior?
I have read a bit of conflicting ideas of leaving the XPS seams open in this case to let it dry better to exterior if needed. As long as the tyvek is taped in good detail with quality tape that lasts.
I have read using the XPS as the barrier itself.. but do not want to miss any detailing on that method and then have issues. The house wrap is a belt and suspenders approach that I feel safer with.
Also I know I’m a bit shy on exterior XPS (dew point) for a 2×8 wall.. but $$ to go any thicker with exterior foam is not likely to happen.
What would you guys do?
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