Insulation for exterior concrete wall options
I am in the prep phase of replacing my shower which has two exterior concrete walls. Here in Florida they usually use a product called Fi-Foil (like a paper bag and foil, radiant/vapor barrier) over 3/4" furring strips against exterior concrete walls. It has an R value of 5.5, but in winter it does nothing to help and is cold in the shower. I know we don't get a lot of cold days here in central Florida. I wanted to take this opportunity to add some insulation behind shower walls since I will be ripping out existing walls. The only option i have found is using 3/4" rigid foam insulation boards, unless I make the wood thicker behind the walls, but in turn will take space out of my shower. Looking for any recommendations. Thanks
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The foil as you noted will keep heat out, but not the cold. You can either use rockwool or 3/4" rigid foam to get you about 3 R value. Not much but it would probably make a difference. If you use a 1/2" foam wallboard (like kerdi-board) on top of it, you will add about 2 more R value for a total of 5.