This is the flooring I chose because Andy Pace of Green Design Center, Waukesha, WI has tested it for off gassing and it is 100% free of formaldehyde off gassing. He is the first person in the USA to have the FRAT device (formaldehyde attenuation release test) with which he can test any surface or product for release of formaldehyde. of course there are THOUSANDS of other HAPs - hazardous air pollutants besides formaldehyde, but he can't test everything, and formaldehyde is usually a good indicator or other gasses that will be present too.
What did you end up going with?
I would have suggested just finishing the subfloor. We did this once and it wasn't even ply, it was chipboard. We found a natural no voc floor paint that sealed and sat on the surface almost like a membrane. It came up great. But you could just linseed oil the plywood, or even stain it. You can also ebonise ply with a steelwool vinegar solution to make it a natural black. Or you can use a clear finish for that scandinavian look. If you need to you can insulate under the floor between the joists.
I am displeased. You are no longer allowed to read this tiny ad:
permaculture bootcamp - learn permaculture through a little hard work