Wall Assembly in Climate Zone 5 with stucco
I’m building an addition in Wisconsin and eventually will be retrofitting the rest of the house. My wall assembly is as follows: 2×4 walls with R15 mineral wool batts, zip sheathing, 3” XPS foam. For the stucco layer I was originally planning on installing 1/2” CDX with 6” structural screws over the foam, 1 layer tarpaper, hydro gap, lath and 3 part stucco. My question, is the CDX directly on top of the XPS ok? Or should I add an air gap like 1/2” or 3/4” furring?
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