basement concrete floors

We want to tile the floors in the basement but on hot humid days the floors get awfully wet with moisture. Is there a way to stop this? Do we need to put a sealer on the floor before we put the tile down?

 

Installing tile on concrete floors with moisture problems is a recipe for disaster. On hot, humid days the moisture may appear because the warm, moist air that settles down through your home to the basement is condensing on the cool concrete. Run fans to improve ventilation and a dehumidifier to reduce humidity to see if the situation improves. Then, do a moisture test on the concrete. Tape a piece of clear plastic near the perimeter of the room on to the concrete and leave 24-48 hours and check for moisture collection. If you see moisture under the plastic, then you have a moisture problem.

http://www.concretenetwork.com/concr...ne_problem.htm

http://www.extension.umn.edu/distrib...s/7051-04.html