One more foam vs fiberglass question.
Other than the cost, any down side to replacing ceiling fiberglass batting with foam?
I know of a few issues in open vs closed cell: closed better R value and better if in contact with moisture/water. Any others?
As I mentioned in another post, I have kraft faced fiberglass insulation on top of tongue and groove ceiling boards. My concern is the loss of heat in winter, and heat gain in summer since the T&G boards do not make a air tight seal.
Would removing the batts and applying foam be a good energy efficiency plan?