Too much moisture can also be a bad thing. During our wet season, the soil surrounding basements gets oversaturated. Around shallow foundations like attached garages, room additions and crawl spaces, this oversaturation softens the ground beneath the foundation and the weight of the structure sinks because the ground it’s resting on turns to mud.
Fortunately our dry spells aren’t as frequent as say, Houston, Texas where residents regularly water the ground around their foundations to keep their clay moist. Then the weight of house foundations sitting on the clay compress those cracks and movement occurs. During dry spells, too little water can dry out clay causing it to shrink and crack. In our area, where many foundations are surrounded by an expansive soil like clay, balancing ground hydration is critical. When configured properly, they effectively direct roof water away from your home. When they are not, large amounts of water are allowed to dump next to your foundation causing seepage and even worse, foundation movement. Gutters and downspouts play an important role in managing rain water around your house.