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radiant heat through 3.5 inches of wood floor?
Hi Everyone -
I was recommended to this site by Alan Forbes, whom I believe is a regular. (hi Alan!) He suggested I pose my particular challenge to your collective knowledge and expertise.
The challenge is that I'd like to install radiant heat beneath existing flooring that is made of 2x4 douglas fir lumber planks turned on edge. The property is a unique one, and no one I've spoken to has ever heard of flooring made of that much wood. The wood looks quite nice and keeping it as is would save us the cost of more wood flooring, so I'd rather go under than over.
Alan is concerned that we won't be able to get adequate heat transfer through the 3.5 inches of wood. From what I've read elsewhere, douglas fir has an R-value of 1.2 per inch, so we're looking at an absolute thermal resistance of 4.2, maybe 4.0 after lots of sanding and then refinishing? In case it matters, the wood planks are 50 years old. On the bottom side of the house the wood planks will have seen lots of wear from weather.
So. . . can it be done?
I'm happy to attach pictures of whatever you'd like to see.
Thank you all in advance!
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