Why lintels fail — and why it matters
Steel lintels span every window and door opening in your masonry building. They carry the weight of the brick above. When they corrode, they expand — sometimes to several times their original thickness — and that expansion cracks, displaces, and destabilizes the masonry they're supposed to support.
Lintel failure is one of the most common findings in Local Law 11 facade inspections. Rust staining below window heads, cracked mortar joints in a stair-step pattern, and displaced bricks above openings are all signs of lintel corrosion. Left unaddressed, the structural consequences escalate rapidly.
Signs of lintel failure
Rust Staining
Brown or orange staining on brick below window heads indicates active corrosion of the steel lintel behind the facade. The staining is surface evidence of structural deterioration.
Cracked Mortar Joints
Stair-step cracking above window and door openings follows the expansion pattern of a corroding lintel. The expanding steel pushes mortar joints apart.
Displaced Brickwork
Bricks pushed outward or dropped above openings indicate advanced lintel failure. The steel can no longer support the masonry weight above.
Sagging or Bowed Headers
Visible deflection in the masonry course above an opening means the lintel has lost structural capacity. This requires immediate assessment.
Recent NYC projects
Replacement methodology
Lintel replacement requires careful sequencing. We shore the masonry above the opening, remove the deteriorated lintel and surrounding damaged brick, install a new galvanized or stainless steel lintel to specification, and rebuild the masonry with proper bearing and mortar compatibility.
Every replacement is sized to current structural requirements — not just matched to what was there before. We verify bearing conditions, specify appropriate steel gauge and coating, and ensure the new lintel is properly flashed to prevent future water infiltration that caused the original failure.
What NYC building owners say
Rust staining below your windows?
Free lintel assessment. We'll determine the extent of corrosion and develop a replacement plan.
Preventing future lintel failure
Lintel corrosion starts with water infiltration. Proper flashing and maintenance prevent recurrence.
Properly installed and flashed galvanized steel lintels should last 50+ years. Stainless steel lintels even longer.
Frequently Asked Questions
Don't wait for the bricks to move.
Lintel failure escalates quickly. Early replacement prevents costly facade reconstruction.