Minimum exterior foam sheathing thickness for a double wall design?
I read the article: http://www.greenbuildingadvisor.com/blogs/dept/musings/calculating-minim... and am questioning what R-value of exterior polyiso is needed to satisfy the moisture conditions in a double wall assembly: 2, 2x4 walls with 3.5" cavity in between. Zone 7/8. In a linear calc., I'd expect ~ R-30. Is this a correct assumption?
Posted Sun, 03/03/2013 - 21:24
Edited Mon, 03/04/2013 - 07:05
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