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A comment on Heat Pumps Work Miracles. Parent comment

Re:Heat Pumps Work Miracles by bluGill on Thursday February 28, 2019 @01:43PM (#19273865)
2x4 can be insulated much higher - around R26. You need to use expensive closed cell foam to do this. It is much cheaper to build with 2x6 which gets you to R19 with cheap insulation.
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Re:Heat Pumps Work Miracles by ip26 on Thursday February 28, 2019 @03:20PM (#19274736)
You can't easily retrofit spray foam though. Either the drywall or sheathing needs to come off, unless the cavity was empty, and even then it doesn't fill evenly if sprayed in a single hole.
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