The water table varies with the season, weather conditions and soil . My exp. you want to try to prevent dampness.As others have said drains around the outside(try to keep bushes-trees away from near the house if possible as roots will clog the french drains).With gravel-stone filled to the top.then some kind of landscape fabric on top to filter out dirt again so the drains do not get plugged. This is the one approach that has worked for us.Thsi will help the dampness then use your paint,dehumidifier.Not sure of your budget,soil,or dampness conditions.The stone and pipe,black tar method is basically labor work.
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