Zip R Sheathing and Interior Closed Cell Spray Foam
Hi we are building a house in the Chicago Suburbs – climate zone 5. We have two questions.
1 – We are looking into using the Zip R sheathing. Has anyone had issues with the zip system in terms of longevity? Our contractor says they have been hearing of some issues with it failing. I am seeing contradicting information on whether it is or is not a vapor barrier. By the literature – it is note, but I am seeing others say differently.
2 – We are looking to to use the 1 1/2″ R Sheathing – so R 6 Continuous with 2″ closed cell spray foam for an R13 on the interior. We want to make sure this wall assembly is not creating any moisture problems. The closed cell will be creating a vapor barrier on the inside, so we want to ensure the wall is able to appropriately dry to the exterior. It is a brick wall so we have a drainage plane. Thoughts?
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