Radiant floor heating: Which way should my vapor barrier face?
I have a question about which way my insulation should face in my particular application. I own a 2 story house sitting on top of a partially below grade basement. The house was built in 1946. I just installed radiant floor heating through the whole house by running 7/8″ PEX up and down every floor joist cavity. Heat deflection shields were stapled over the PEX all along its route to disburse the heat better to the floor.
My question concerns the basement. The basement is not a finished space but it will before too long. My plan is to have a home gym, a laundry room, and my giant wood shop. I’ll probably just use a space heater in those areas since their usage will be low and intermittent. In the basement, in the floor joists for my heated 1st floor, I put in a radiant barrier 2″ below the PEX, and R-30 insulation below which fills the 2×10 joists completely, leaving the small air space for the PEX to heat. The R-30 insulation is Kraft faced and I installed it with the Kraft side towards the basement (the cold/unconditioned side). I live in the Northeast, so it’s a cold climate, and common practice is to have the Kraft side always face the warm side. I wasn’t aware of that until now and I’m about 75% done installing the insulation.
I called the radiant company that I bought everything through and they said I installed it correctly. But this seems to go against common practice. Should I flip all the batts over or leave it alone?
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