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Links:
[1] http://forums.finehomebuilding.com/members/dwmorenz
[2] http://forums.finehomebuilding.com/breaktime/project-house-qa/engineered-flooring-above-garage-space
[3] http://www.quittintime.com/
dw
I've put engineered flooring of several kinds over concrete, over crawlspaces, on a subfloor of several different kinds-I don't think you'll have a problem.
Do you plan to nail, glue, nail/glue, or float the floor?
If floating, there's several quality flooring manufaturers that have a proprietary underlayment that you should be able to find that would address your below moisture concerns. I would assume a finished ceiling below your floor frame, which should do quite a bit to keep the cool air down below, along with the moisture. I am not talking about a laminate floor here, but they also have prop. underlayments that will work.
If you don't float, a slip sheet that also blocks moisture-in the old days we'd use felt paper. Rosin doesn't do much but divorce the subfloor from the finished flooring.
I've used some new synthetic roofing underlayments that might possible fill the bill, but would never recommend without you doing some research. (if the thought of felt paper perhaps offgassing turns you off).
A Great Place for Information, Comraderie, and a Sucker Punch.
Remodeling Contractor just outside the Glass City.
http://www.quittintime.com/ [3]