What Sagging Lintel Above the Garage Door Tells You About Your Foundation Repair
The lintel is the horizontal beam that carries the wall and brick veneer across the top of the garage door opening. A failing lintel shows as a visible dip or downward bow in the brick course above the door, a horizontal crack running along the mortar line just above the opening, rust staining or a widening gap where a steel lintel sits, or brick that has begun to separate and step-crack near the corners of the opening. Because the garage door is typically the widest single opening in the home, problems here deserve prompt attention.
Humid, coastal Alabama air and the wet Gulf climate accelerate corrosion of steel garage lintels in Mobile and along the coast, while expansive clay under the supporting columns drives settlement in Birmingham, Huntsville, and Columbus, Georgia.
What Causes Sagging Lintel Above the Garage Door in Alabama Homes
Undersized or Corroding Steel Lintel
Many homes use a steel angle lintel above the garage door. Over decades, especially in humid and coastal Alabama air, that steel can corrode and lose stiffness, or it may have been undersized for the span from the start. Either way it deflects under the brick load and the course above begins to sag.
Settlement of the Supporting Piers
The lintel bears on the masonry columns on each side of the garage opening. If the foundation beneath one of those columns settles, the whole beam drops or tilts, opening cracks at the corners and bowing the brick above the door.
Long-Span Load Concentration
A wide garage opening concentrates a large amount of wall and roof load onto a single beam and its two supports. Any weakness in the beam or its bearing points shows up quickly here because the span leaves little margin.
Moisture and Freeze Exposure at the Opening
Water intrusion at the top of the opening accelerates steel corrosion and mortar deterioration. In the Alabama and Georgia climate, repeated wetting at an exposed lintel speeds the loss of support over time.
Signs You Should Not Ignore
- A visible dip or downward bow in the brick course above the garage door
- A horizontal crack along the mortar line just above the opening
- Rust staining or a widening gap at a steel lintel
- Step cracks forming at the upper corners of the opening
- The garage door itself binding or no longer sitting square in the frame
How We Diagnose and Repair the Problem
- 1
Free On-Site Assessment
An APS technician visits your property, documents the symptom and severity, and reviews all related indicators to build a complete picture.
- 2
Root Cause Diagnosis
Repair restores support across the span, which can involve reinforcing or replacing the lintel and, where a supporting column has settled, stabilizing that foundation with push piers or helical piers so the beam has a solid bearing again.
- 3
Written Estimate
You receive a clear written scope of work and cost estimate before any repair begins. No obligation.
- 4
Repair With Transferable Warranty
All APS foundation repairs carry a warranty that transfers to future owners. Serving Birmingham, Mobile, Huntsville, and Columbus, GA.
“The garage lintel spans the widest opening in the house on one beam. When it starts to bow, we look at both the steel and the footing under the columns holding it up.”
Frequently Asked Questions
Is a sagging garage lintel dangerous?
It is a structural issue that should not be ignored. The lintel carries brick and wall load across the widest opening in the home. Continued deflection can lead to falling masonry and a widening failure. Prompt inspection is the safe course.
Is this a foundation problem or a beam problem?
It can be either or both. Sometimes the steel lintel itself has corroded or was undersized. Other times the masonry column beside the door has settled and dropped the beam. APS determines which so the repair matches the actual cause.
Can I just patch the crack above the door?
Patching the mortar hides the symptom but leaves a beam that is still deflecting. If the lintel or its support is failing, the crack returns and the sag grows. The support has to be restored for the repair to hold.
Why does the garage opening fail more than other openings?
It is the widest single span in most homes, so it carries the most concentrated load on one beam and two supports. That leaves little tolerance for corrosion or settlement, and problems become visible there first.