Moisture problems with double-stud walls
I have read the article on double-studded walls very carefully. Moisture elimination is one of the issues that I am trying to resolve in my mind before attempting a low-energy home.
I am considering using the six-inch wall with staggered 2X4s since it reduces the thermal transfer by approximately 20% in my calculations. The design that I am considering is as follows:
•Cement board siding
•One-half inch vented rain screen
•ZIP System R3 as the exterior sheathing to replace OSB, Tyvek and blue-board insulation
•Two inch layer of high-density foam sprayed on the interior of the ZIP System R3
•Three inch fiberglass batting
•One half inch plaster board sheeting on the interior face
I am trying to achieve an R30 wall with zero air leakage due to:
•the moisture barrier and seam taping of the ZIP System R3 product
•the two-inch layer of high-density spray foam
Based on your extensive experience, do you see any moisture problems in such a construction?
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