Sill Plate Leaks- Water leaking over top of foundation or slab.
A sill plate leak occurs when water enters your basement or onto a slab because the ground outside is higher than your foundation wall or slab. This often happens when:
- Exterior siding is buried below the dirt or concrete, allowing water to seep between the first-floor framing and the top of the foundation or slab.
- Contractors raise the ground level with pavers or new concrete, unintentionally creating a water path into your home.
Common areas for sill plate leaks
- Front Entrance on center hall colonials
- Under windows
- Under side door entrance
- Any area where concrete, pavers, mulch or dirt was installed above top of foundation or slab
Key Prevention Tip: Siding should never be buried below the ground. At least 3 inches of the foundation should remain exposed above grade. Buried siding also invites insects, including termites, as soil against the framing creates a direct path for pests.
Trapped water in raised porch of a center hall colonial -above
Our Solutions
Basement Waterproofing Solutions provides tailored solutions depending on the situation:
1. Exterior Drain System
- Diverts water away from the foundation to prevent seepage.
2. Detailed Exterior Repair
- Excavation alongside the foundation to access the problem area.
- Remove and replace any wood rot.
- Install wire mesh over all below-ground framing and plywood.
- Apply hydraulic cement over the mesh.
- Finish with a primer/sealer and a rubber sheet membrane, protecting against water and pests.
Important Note:
- Sill plate repairs should never be attempted from the interior, as moisture will continue to damage framing.
Interior-only repairs leave you at risk for mold, water damage, wood rot, and insect infestation.
This ensures homeowners understand the cause, risks, and proper repair method for sill plate leaks, emphasizing why professional exterior repair is essential.