Water is a killer. It seeps through concrete, settles in basements, sprouts mold and empties wallets. The very worst thing that water can do is weaken your foundation, causing the foundation walls to crack, settle and spread havoc to the rest of the house. The cost of repairing and sealing a busted foundation can start at $10,000 and can go as high as $40,000 [source: Edge].
The best way to avoid this extremely costly repair is to keep water far away from the foundation. When a home is constructed, the ground around the foundation should slope slightly away from the house. If not, rainwater will pool around the foundation and exploit any structural weakness to seep its way into the house. If you see standing water where the house meets the ground, consider applying soil to create the right slope.
Clogged gutters and downspouts are also trouble spots. Make sure that rainwater can flow easily from the roof into the gutters, down the downspouts and away from the house. A simple solution is to add downspout extensions that discharge water 5 to 10 feet (1.5 to 3 meters) from the foundation [source: Edge].