Posted by chris on June 21, 2000 at 16:50:38:
Inadequate grading around the foundation of the house can result in bad water drainage and could possibly lead to a wet basement. Be sure all down spouts are dumping water sufficiently away from the house(5+ feet) by using splash blocks or a drainage system. Are the gutters clean so that water is flowing through the downspouts and not overflowing. You may want to get on a ladder and head up and look for leaves or anything blocking the flow.
Grout will allow moisture to pass unless it has been sealed with grout sealer. Over time, the underlying surface will swell and crack the grout. This allows more water to enter and makes the problem worse.
To determine whether you’re dealing with condensation or a floor leak, dry the wet area with a hair dryer and tape a 1-foot square piece of plastic wrap on the floor. Wait 24 hours. If moisture forms under the plastic wrap, then the source of your leak is outside. If not, it’s condensation.
Check these basics to make sure what is in place is working properly then post back if you still have problems.