Moisture test your plywood subfloors first. Then glue that 3/8" x 4" wide plank down. Since it's an engineered, it will withstand wider swings in humidity and temperature more so than a solid floor will. I think that floor would feel better glued down due to it's relatively thin profile. It should work fine over radiant but always check with the manufacturer. Use the adhesive recommended by the manufacturer. I also prefer to use a 3/8" plywood CDX underlayment installed on top of the subfloors to glue engineered down to. If the flooring needs to be repaired, a glued to the subfloor repair could trash the subfloors.
Read this:
http://www.hardwoodinstaller.com/hardwo ... .php?t=385
Quote:
When gluing down an engineered floor over a solid lumber subfloor, you will need an underlayment of 3/8" plywood, at least. When gluing down to a plywood or OSB subfloor, many are tempted not to use an underlayment. I prefer to use a 3/8" plywood underlayment over a plywood subfloor when gluing down a wood floor because if the floor needs to be repaired or replaced, it is easier/better with underlayment than with the subfloor.
And BTW, the 15# asphalt felt and other similar products are NOT vapor barriers. They are vapor retarders. Big difference.
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