Contractors do just the opposite... A contractor will promote water coming in by drilling holes in the bottom row of block walls. The hydrostatic pressure is released and water is then drained and controlled with a varity of waterproofing systems available to contractors. Some systems are sub-floor systems some systems sit on top of the footer and some sit on top of the floor. All systems relieve hydrostatic pressure then drain the water seepage to a sump pump or some type of drain.

If you're going to do-it-yourself... Use the SquidGee™ Dry system and you'll enjoy a clean dry basement.