Foundation Crack Repair After a Failed Foam Injection — Bettendorf, Iowa

A previous foam injection on this Bettendorf foundation crack had failed and left a mess without stopping the leak. Behncke Construction hand-excavated the exterior, then sealed the crack from both the outside and the inside.

PROJECT SUMMARY

Date posted: October 13, 2026
Service: Foundation crack repair
Location: Bettendorf, Iowa
Problem: A leaking foundation crack where a prior foam injection repair had failed
Solution: Exterior hand-excavated to expose the crack; crack sealed from both the exterior and the interior
Foundation type: Concrete block
Completion status: Completed

Project photos

Foundation crack sealed from the interior in a Bettendorf basement
The crack sealed from the interior.
Interior foundation wall with the crack sealed
The interior wall after sealing.
Hand-dug exterior excavation exposing the foundation crack
Hand excavation exposing the crack from the outside.
Exterior excavation down the foundation wall at the crack
The excavation down the exterior wall.
Failed foam injection residue running down the foundation crack before repair
The failed foam injection left on the wall before our repair.
Foundation crack with the old foam injection material before the repair
The old foam residue along the crack before removal.

Project overview

This Bettendorf, Iowa foundation crack had already been “repaired” once with foam injection. The foam failed, the crack kept leaking, and the wall was left with hardened foam running down it.

Project details

The crew carefully excavated the foundation by hand to expose the crack from the exterior, then sealed it from the outside. They sealed it from the inside as well.

Repairing both sides is deliberate: stopping water at its source outside matters as much as protecting the interior, and the second seal is the layer of protection that covers a future failure of the first.

What homeowners should know

Injection repairs, whether polyurethane foam or epoxy, work by filling a crack from the inside. They can be a reasonable fix for a dry, stable crack in a poured wall. They fail when the crack keeps moving, when the material does not fill the full depth, or when water pressure from outside simply finds a path around the plug. A failed injection is easy to spot: the leak returns and the cured foam is still there.

An exterior repair reaches the side of the wall the water is actually pushing on. Exposing the crack by hand keeps the excavation small and avoids disturbing the foundation, and sealing outside plus inside means neither layer has to be perfect on its own.

If a previous crack repair has failed, the useful question is why: movement, depth, or water pressure. The answer decides whether a two-sided seal is enough or whether the wall needs a structural look. Behncke documents what we found on repairs we don’t recommend and on why foundation repairs fail.

Photo highlights

  • The crack sealed from the interior.
  • The interior wall after sealing.
  • Hand excavation exposing the crack from the outside.
  • The excavation down the exterior wall.
  • The failed foam injection left on the wall before our repair.
  • The old foam residue along the crack before removal.

Related services

A crack repair that didn’t hold?

Behncke Construction gets to the source of the leak and seals the wall from both sides. Contact us or call (563) 332-6045.