Solving thermal bridging.

Green Building Q&A: Solving thermal bridging.

I am building a wood frame home in southern Maine. I am using a combination of 2" spray foam and unfaced fiberglass batt in the exterior 2x6 walls for a total of R25. Would installing 3/4" rigid foam board insulation between the exterior 1/2" sheathing and the cement board siding create any moisture issues in the sheating, given there is spray foam on one side and rigid foam on the other? I am concerened about thermal bridging.

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