Exterior Foundation Crack Repair & Grading Near a Basement Window — Davenport, Iowa

A leaking foundation crack near a basement window in Davenport, Iowa, repaired from the outside with a flexible waterproofing system, plus added soil and better slope to move rainwater away from the wall.

PROJECT SUMMARY

Date posted: November 12, 2026
Service: Exterior foundation crack repair and grading
Location: Davenport, Iowa
Problem: A foundation crack near a basement window and water collecting beside the basement wall
Solution: Crack sealed from the exterior with a flexible waterproofing system; soil added and slope improved along the foundation

Project photos

Side yard of a Davenport home after foundation crack repair and regrading
The side of the house after the repair and regrading.
Excavation beside a basement window for a foundation crack repair in Davenport
Digging beside the basement window to reach the crack.
Excavated area along the foundation below a basement window in Davenport
The excavation along the foundation below the window.
Foundation crack exposed in the exterior excavation in Davenport
The crack exposed on the outside of the foundation wall.
Waterproofing and protection board placed over a repaired foundation crack in Davenport
The repaired crack covered with protection before backfill.
Regraded soil and lawn beside a basement window in Davenport
The regraded area beside the basement window.

Project overview

Behncke Construction repaired a foundation crack next to a basement window at this Davenport home and improved the grading along the wall so rainwater runs away from the house instead of collecting against it.

On the job

The crew dug down beside the basement window, exposed the crack on the outside of the wall and sealed it with Behncke’s crack repair system. It is designed to stay flexible for decades, so as the foundation moves with seasonal temperature changes and shifting soil moisture, the waterproofing moves with it and keeps a watertight seal. That flexibility is what keeps a repaired crack from leaking again.

After backfilling, soil was added and the slope along the foundation was improved to cut down on water collecting beside the basement wall. Fixing the entry point and improving the drainage work together. Behncke Construction has served the Quad Cities since 1948.

Photo highlights

  • The side of the house after the repair and regrading.
  • Digging beside the basement window to reach the crack.
  • The excavation along the foundation below the window.
  • The crack exposed on the outside of the foundation wall.
  • The repaired crack covered with protection before backfill.
  • The regraded area beside the basement window.

Related services

Leaking crack, wet basement or drainage problem?

Behncke Construction has repaired foundation cracks and fixed drainage across the Quad Cities since 1948. Request a free estimate or call (563) 332-6045.

From the field

Why they called. Foundation crack near a basement window; water collecting beside the basement wall.

What we did. Excavated beside the basement window and sealed the crack from the exterior with a flexible waterproofing system; added soil and improved the slope along the foundation.

Result. Crack sealed from the outside and grading improved to direct rainwater away from the home.