I’ve received several opposing answers regarding the wisdom of installing 1×6 tongue and groove pine flooring over a hydronically heated floor. Is it a good idea, or will the pine shrink up too much because of the constant heat? Obviously I’ll condition the pine to the house first. Has anyone done it, and gone back to see it later?
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I do know of up to 1 x 10 T&G pine being installed over RFH. Full bed of Bostik's as well as rosehead nails.
It was a well-designed system, and I've seen pics after a few seasons and the flooring still looks goods. Some "standard" gaps, nothing horribly excessive. 1 x 6 would be even more forgiving.
I did once get ifo from a company that makes an engineered ply flooring from river salvaged heart pine or reclaimed barn beams. The stuff looked absolutely fabulous. I haven't looked at the literature lately, but I'm back-of-the-mind considering it for an addition on my own home.