Help me validate my thinking – exterior insulation
We are finalizing the construction details of our build in zone 5 – 2×6 wall construction. Originally we were looking at using 2″ of exterior XPS on our home, but found quickly with the Hardie siding that is causes quite an incremental cost due to labor for fastener and furring details. I really want to eliminate the thermal bridging so we are now considering 3/4″ GPS or XPS with LIB bracing and without osb. Then doing flash in batt with 2″ closed cell and R13 walls. Based on the ratio rules, I should be fine with use of external insulation. Is there anything I am missing in regards to durability for this construction?
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