I'm not clear on your problem. If the moisture is coming from the floor, then let it breathe. I mean, if it's moisture, let it breathe. If it's "water", you don't want to pass GO! If you seal the floor or start gluing tiles to it, the moisture will eventually ruin the finished job. Consider a floor that requires Sleepers. It will raise your floor so consider the headroom. Plan B might be to use an indoor-outdoor carpet. Again, don't glue it to the floor or seal the floor. Sometimes, that's the best you can do.
If the moisture is coming through the outside walls, you have a couple of options. 1) Mitigate the source from OUTSIDE the basement, 2) as stated above, as long as the moisture is moisture (not water) that's coming through, you can let it come in. Use a Pressure Treated wood in EITHER scenario! It won't rot.
THEN, the last thing you do is build in a dehumidifier. You see, it's OK to let moisture in as long as you get rid of it. Be sure to THINK AHEAD as to where you're going to run your tubing for the dehumidifier. My Municipality prevents me from 'dumping' the water into the Sewer System. Also, if you route it outside, it needs to 'run' somewhere. Also, if you experience Winter, you need to prepare for that too.
My best to ya and hope this helps.
Jay J -Moderator
PS: There are plenty of DIY books that go through the steps of finishing a Basement. Since you're doing the work yourself, spend some of that saved $$$ on a GOOD book!
PPS: God Bless America!
[This message has been edited by Jay J (edited March 06, 2003).]