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I have a ranch style home built around '60 to '63, no one seems to know for sure. I am replacing the paneling in my living room, and behind it is a layer of plastic sheeting and 3" foil backed fiberglass insulation in the walls. It is Owens Corning brand, 3" thick. It has printing on it that says "THICK F1S 3 INCH", but nothing that states the R-value. I can't seem to find any info on the web about this product. I am replacing it with spray-in closed cell foam, but I am curious to know how much R-value I have, so that I know how much I am increasing it?
Thanks.
Thanks.