On Sun, 16 Apr 2006 14:57:09 -0400, Davoud wrote:

Is it necessary or desirable to use a soft underlayment when installing
3/4" nail-down hardwood flooring on 3/4" plywood sub-flooring? The
floor is above ground level.

All of the installers we work around use felt (tar paper) under solid
hardwood flooring.
Under the laminate flooring they use some kind of thin blue foam pad
which I think is recommended (if not required) by the manufacturer.

Mike O.