Stair-Step Cracks
Cracks that follow mortar joints diagonally away from the top corners of your window.
Family Owned in Chicago Since 1992
Stair-step cracks above a window rarely mean a failing foundation. In Chicago brick buildings, the culprit is almost always a single rusted lintel. Deal directly with our family to fix the structural source, not just the cosmetic symptom.
Or call directly: (773) 286-3560
A+ Accredited

The Hidden Cause
The steel angle above your window or door is responsible for carrying the massive weight of the masonry above it. When that steel is exposed to moisture, it corrodes and begins to expand—a destructive process known as rust jacking. This expansion exerts incredible pressure, forcing the surrounding brickwork apart.
Cracks that follow mortar joints diagonally away from the top corners of your window.
A crack running straight across the mortar joint right above the opening.
Orange or brown streaks bleeding through the brick or mortar.
Bricks above the window that appear to sag, bow, or protrude outward.
The Warning
Caulking over these cracks makes the problem worse by trapping more moisture inside. The only safe, long-term solution is replacing the compromised steel.


Structural Repair, Seamless Finish
Before removing any masonry, we install temporary shoring to safely carry the load of the building while we work.
We carefully remove the bricks above the window, extract the rusted lintel, and install a properly sized, corrosion-resistant steel replacement.
We precisely relay the brick and color-match the fresh mortar so the repair seamlessly blends into your existing wall, maintaining your home's historic aesthetic.
A Family Name Behind Every Job
For over three decades, Star Tuckpointing Inc. has protected Chicago homes from the harsh freeze-thaw cycle. When you hire us, you are getting a licensed masonry contractor dedicated to lasting craftsmanship. Let our family replace your failing lintels before they cause severe structural damage.
Peter Kleszcz, Owner
5816 W. Irving Park Road, Chicago, IL 60634
Tell us what your property needs. We'll follow up directly.