Grading Your Yard to Protect Your Foundation From Water

Water is the biggest threat to a foundation. If your yard slopes toward the house, rain and irrigation run down and pool against the walls. Over time, that moisture seeps into the concrete or masonry, causing cracks and weakening the structure.

In a mild marine climate with wet winters and dry summers, the seasonal rains can be heavy. A properly graded yard directs that water away, reducing the risk of foundation movement and water damage inside your home. It also helps keep your crawlspace or basement dry.

For minor low spots, you can add fill soil and compact it. Use clean, compactable soil, not topsoil with lots of organic matter. Build up the grade near the house and taper it down over 10 feet.

You can also extend downspouts so they discharge water at least 5 feet from the foundation. A simple splash block or a buried drain pipe can keep water away. Keep the soil level below the top of the foundation, so you don't create a path for termites or moisture.

Grading is not a one-time fix. Settling soil, erosion, and landscaping changes can alter the slope over the years. Recheck the grade every spring and after any major excavation or planting.

Keep an eye on any new dips or areas where water collects. In a climate with wet winters, the rain can reveal problems quickly. Address small issues before they become big ones, and your foundation will stay drier and safer.

• Recheck the slope after heavy rain
• Add soil to low spots as they appear
• Keep downspout extensions in place
• Avoid planting water-loving shrubs near the foundation
• Consider a rain barrel or dry well for roof runoff