There’s no simple answer because rainwater can enter your home in a variety of ways. However, the root of the problem is related to pressure. When it rains or snows, the soil around your home becomes saturated with moisture, which can push its way through your basement walls and floors. Water enters homes in several areas. The most common trouble spots include cracks in the walls and floor, at the place where concrete meets the wall, or through cracks in mortar joints of block or masonry foundation walls.