Look at www.kahrs.com.

I installed the wood flooring "floating" over an underlayment supplied
with my Kahrs order. True, I did it on the second floor over the wood.

The cement has to be dry and relatively level.

Bill Fischer.

wrote:
Any suggestions on how to go about installing a hardwood floor over a
concrete slab?

I'd rather go wall-to-wall carpet for obvious insulation benefits but
never mind that.

Would laminate be the way to go? If so, any kind of under-material
required or recommended?

Thanks!