I live in upstate New York and am remodeling my family room. It is adjacent to my garage. When I removed the ceiling tiles I can now see what my walls are insulated with. It looks like it is foam board with grey foil on it. I am not sure how thick it is. The wall studs are 2×4. If there is enough room for the batt insulation can I just install the batts over the foam board or should I remove the foam boards and just install my batts? Thanks in advance for any replies.
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