Rigid insulation and fiberglass batts in a wall cavity
I recently completed a full renovation of one bedroom in our home located in Central PA. When I had the room completely gutted i found that the house had been framed with rough cut (true) 2×4 studs. Because I had a full four inch cavity my father in law suggested that I install a layer of 1/2″ blue board against the exterior sheathing for additional r-value and then install 3 1/2″ fiberglass insulation. I followed his suggestion and closed the wall with 5/8″ drywall. I just recently came across some information that has me now questioning whether or not this was a wise idea as the rigid insulation may act as a vapor barrier and allow condensation to collect inside the wall cavity.
I am worried that I may have moisture build up within the walls. Is my concern legitimate or am I worrying for nothing. If it is a potential issue, is there a minimally invasive way to go about checking the wall cavity such as probing the cavity with a moisture meter?
Any comments or advice would be greatly appreciated.
Thanks in advance.
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