Under Slab is the best way to protect your in floor heat and control Radon
Adding from above adds extra insulation without
impeding on interior finish work and you get a huge reduction in heating bills
Install 2 inch R12 closed cell on foundation
then no vapor barrier is required and
moisture is eliminated.
Install plumbing protected from freezing in front and between the wall.
Install R 12 fiberglass batt after the plumbing.
Then install a R12 fiberglass batt and you have your warm, to code finished basement.
THIS IS THE ONLY WAY TO INSULATE A VAULTED CEILING
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