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Old 07-13-2018, 07:27 AM   #81
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Join Date: Jul 2005
Location: Fairfax, Va
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I briefly considered spray in foam for those two bays, but I don't think closed cell foam is available to a DIY'er (open cell isn't much better than fiberglass).

I'm more concerned about the water lines in those two bays than I am about comfort (R19 walls seems fairly effective in our region). But, there were water lines in one of those bays originally and we never had a problem. The pipes were haphazardly insulated, and that pipe insulation deteriorated over decades. So I think the combination of sealing the stud bays, well installed fiberglass, and leaving the front of the pipes clear of insulation so they can pick up heat radiated from the wall, should do the trick.

I'm even contemplating running the heated floor under the free standing vanities for added insurance.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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