What Landscaping Changes Can Prevent Foundation Water Damage?

The ground around your foundation should slope away from the house for at least 6 feet. A slope of about 6 inches over that distance helps rainwater flow away instead of pooling against the walls. Check the grade after heavy rain or snowmelt, since soil settles over time.

If you notice low spots where water collects, add topsoil and compact it gently. Avoid piling soil against the foundation itself, because that can trap moisture against the concrete or brick. In a humid continental climate, the freeze-thaw cycle can shift soil, so recheck the grade each spring.

• Use a level to check the slope every few feet
• Add soil in layers and tamp it down lightly
• Keep the grade at least 6 inches below the siding
• Recheck after heavy storms or snowmelt
• Avoid creating a berm that directs water toward a neighbor

Trees and shrubs with aggressive roots can damage foundations over time, while dense mulch against the wall holds moisture. Plant beds should have a bare gap of at least 6 inches between the soil and the siding. Use a shallow layer of mulch, about 2 to 3 inches, and pull it back from the foundation.

Select plants with shallow root systems, such as small perennials, instead of large trees near the house. If you already have trees close to the foundation, consider consulting an arborist about root barriers. Keep the soil in plant beds well drained, and avoid overwatering, which can saturate the ground next to the walls.

• Keep mulch 6 inches away from the foundation
• Choose shallow-rooted plants for beds near the house
• Water plants deeply but less often to reduce saturation
• Remove dead roots that can create channels for water
• Use a weed barrier that allows drainage

Clogged gutters overflow and dump water right next to the foundation. Clean gutters at least twice a year, especially in late fall after leaves drop and in early spring after snowmelt. Check for leaks or loose joints that can spray water against the siding.

If you have a basement or crawlspace, inspect the interior walls for damp spots after a heavy rain. That can signal that water is seeping through the foundation. For ongoing issues, a foundation waterproofing service may help, but first fix the grading and drainage problems.