I'm installing a tongue-in groove wood floor in my bedroom and closet, but want to make sure I'm doing it right. I've removed the carpet/pad and all the strips, nails, and staples. Swept it up real nice, and now ready to move forward.

What exactly do I need to put down? According to the directions on back, it says to lay this mat stuff (I can't remember exactly what it says), and to be sure it has a polyfilm back. The stuff i have is a blue, and does have the film on the back, and the guy at home depot said its all I need to put between the concrete and my wood, for the moisture barrier. It doesn't mention nailing/stapling/glueing/welding (just kidding) the mat to the concrete floor...is it supposed to be just laid down?

Now, i've been saying concrete, but I'm not sure if it's actually concrete. It is the 2nd flr of a condo, and looks like concrete, but I'm not sure if it actually is bonafide concrete.

Thanks for all your help!

It's a light weight type of cementious floor called gypcrete. It's poured over the subfloor for fire retardation in multi storied buildings. You cannot nail or glue wood flooring to it. However, it sounds as if you are planning on installing a floating type floor, which is perfect for going over gypcrete. The pad you have is an underlayment for floating floors and sounds as if it is a 3 in 1 pad, which is also good. Just broom clean the gypcrete floor well and lay the pad. It isn't glued down. I use some of the boxes of flooring to hold the pad in place while I am installing the flooring. Good luck. Consider reading this:

http://www.hardwoodinstaller.com/hardwo ... loater.htm

You do have to seal / tape the seams with clear packing tape(high perm rating), if it doesn't have the peel & stick overlap flap.