I DONT KNOW WHERE YOU ARE, BUT IN TEXAS WE HAVE TO KEEP OUR FOUNDATIONS WATERED DUE TO EXSPANTION AND CONTRACTION. ESPECIALLY THE NW SIDES. CONSIDER FRENCH DRAINS, AND OR RAIN GUTTERS TO KEEP WATER OUT OF GARAGE. ALSO LOOK AT THE GRADE AROUND THE HOME. MANY TIMES THE BUILDERS DONT PUT ENOUGH THOUGHT IN TO DRAINAGE. SOMETIMES ALITTLE GRADE WORK CAN DO WONDERS. DOES YOUR DRIVEWAY SLOPE TOWARDS THE GARAGE? IF SO IT SHOULD HAVE SOME FALL TO ONE SIDE OR THE OTHER TO CONTROL CASUAL WATER.