Relative value of air sealing at exterior sheathing
I am trying to understand the relative value of air sealing at the sheathing. To do this lets consider cost as the benchmark. I realize that there is value beyond cost but this is an easily quantifiable benchmark and the one that seems most resonate with my clients.
Lets assume that we have two identical houses with 8′ ceilings and 350 LF of exterior wall we are sheathing it with OSB and sealing at the top and bottom plates with caulk and nails at 6″ on center. On one house we are going to spend an extra $700 using high quality tape to seal the seams of the OSB before carefully wrapping with house wrap that is taped. On the other house we are simply using the carefully installed house wrap, which is taped, but no tape at the OSB seams. We are in hot humid climate zone 2.
What is the range of time that I can honestly tell my client that it will take to recoup the $700 investment in tape to seal the OSB?
What is a measure of other compromises that come from not sealing at the OSB?
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