Yes, it must be a glue down wood or a floating wood floor.
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If it sits over a cement floor, then no. If it is a nailed down floor, then you can, but you still have to install a cement board.
To install hardwood, first you need a bare floor, then you install the lined paper barrier, then you nail in the hardwood strips, sand it down, and then add a finish such as poly.
No, parquet has been known to buckle because he moisture in the cement has nowhere to escape too.
You can. You start by applying moisture barrier to the concrete--flooring stores have it--then gluing the hardwood to the concrete.
Nope, you need to take out the old one, i believe. Edit - No, I disagree with this. This depends on the situation. If you have a hardwood floor installed on top of plywood, it is generally better to remove the hardwood and replace it. But, if there is no subfloor (and this is sometimes the case in the older homes in our area), then sometimes it is actually fine to install on top of the hardwood. The hardwood (or often pine if it's older) then becomes the subfloor and then you can nail on top of that. It is important, though, that the hardwood is installed perpendicular (or diagonal to that) for better installation. Oh, and it's important to look at heights and make sure there is enough clearance for the wood and that doors can be opened (or shaved).