05 Mar '13, 3pm

Double Exterior Wall Question: #green

Since I already own the OSB sheathing for our new central Indiana home, I’ve been stressing over all the concerns with using OSB in a double exterior wall assembly. I’m trying to come up with a solution that keeps my sheathing on the exterior of the double-wall assembly – and prevents it from turning to oatmeal!! Is there a concern with assembling the exterior wall as follows: 1) Frame 2x4 exterior structural walls. The sole plates would sit on top of foundation. The interior walls would rest on top of floor system. 2) Apply membrane (Tyvek, 6 mil poly or even 45 mil EPDM?) to outside of wall framing – from top of foundation and terminate above attic insulation. This would serve as the air barrier and vapor retarder – the purpose for this is to reduce the high levels of summer humidity from migrating toward air-conditioned space. 3) Install vertical 1x4 strapping to wall s...

Full article: http://www.greenbuildingadvisor.com/community/forum/energ...

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