Hi All,
I have a timber framed house, the sub-floor of which was built with thick 2-in pine tongue and groove boards. This subfloor is also functioning as the main floor of the house in living room area, there is nothing on top of them. These boards have tons of character and I would like to keep them as the main floor.

I am renovating the down stairs and will be converting my hydronic base board heat to radiant floor in the kitchen and bathroom where I can run the pipes over the existing subfloor (plywood in these areas not the tongue and groove pine).

Ideally, I would like to have radiant floor heat in the entire down stairs but am concerned about the efficiency of running the tubes under the thick subfloor in the living room area. The house is built on piers and I can access the crawl space under the house to install tubing and insulate.

I am hoping to get some insight on running hydronic radiant floor heating under these thick sub floor boards or keep this area as hydronic baseboard heat. Thanks for the input!