Steel lintels are the hidden structural elements that span every window and door opening in Brooklyn's brick and brownstone buildings. They carry the weight of the masonry above the opening, transferring that load to the walls on either side. When a steel lintel rusts, it expands to two or three times its original thickness — a phenomenon called rust jacking — and the force pushes bricks upward and outward, cracking the facade and threatening the structural integrity of the wall.
AK Roofing 3D replaces corroded steel lintels on Brooklyn row houses, brownstones, and apartment buildings. We install galvanized steel replacement lintels, repair the displaced masonry, and restore the structural and visual integrity of your facade.
How steel lintels rust — and why Brooklyn is especially vulnerable
Steel lintels corrode when moisture reaches the metal. In Brooklyn, the primary culprits are failed mortar joints above the lintel, missing or deteriorated through-wall flashing, and direct water exposure from failed window sills or capping. Once water contacts unprotected steel, oxidation begins. The rust occupies more volume than the original steel, creating enormous outward pressure against the surrounding masonry.
Brooklyn's freeze-thaw cycles accelerate the process. Water enters the lintel area, freezes, expands, and pushes more moisture against the steel. Over decades, a lintel that started as a clean steel angle can become a swollen mass of rust that has displaced brick courses, cracked window frames, and created visible gaps in the facade. Every neighborhood with pre-war brick housing — Bed-Stuy, Crown Heights, Bushwick, Park Slope — has this problem.
Signs your lintels need replacement
- Visible rust staining below window or door openings — orange or brown streaks on the brick face
- Brick displacement — courses of brick above the opening pushed upward or outward
- Cracking above windows — horizontal or diagonal cracks running through the masonry above the lintel
- Windows or doors that no longer close properly — the lintel has shifted enough to warp the frame
- Bulging masonry — the wall above the opening visibly bows outward
- Water intrusion at window head — water entering at the top of the window indicates failed flashing and probable lintel corrosion
- Audible creaking or shifting — in severe cases, structural movement is audible during temperature changes
Our lintel replacement process
- 1
Lintel condition assessment
We inspect the lintel from both the exterior and interior where accessible. We check the extent of rust, the degree of brick displacement, and whether the wall structure above has been compromised. In some cases, we probe the lintel to determine remaining steel thickness.
- 2
Temporary shoring
Before removing the existing lintel, we install temporary supports (acrow props or shoring posts) to hold the masonry above the opening. This is a critical safety step — the lintel is carrying significant weight, and removing it without support risks collapse.
- 3
Masonry removal
We carefully remove brick courses above and around the corroded lintel, working back to sound masonry. Displaced or damaged bricks are set aside — those in good condition are cleaned and reused; those that are cracked or spalled are replaced with color-matched salvage brick.
- 4
Rusted lintel removal
The corroded steel lintel is cut and removed. We clean the bearing surfaces (the masonry pockets where the lintel sits) and verify they are sound and level.
- 5
New lintel installation
We install a new galvanized steel angle lintel sized to match or exceed the structural requirements. The lintel is set in mortar, leveled, and properly seated on sound bearing surfaces. For Brooklyn buildings, galvanized steel is the standard — it resists corrosion and eliminates the rust jacking that destroyed the original.
- 6
Flashing installation
We install new through-wall flashing behind and above the lintel, with weep holes at the ends to drain any moisture that reaches the lintel area. This is the detail most original Brooklyn buildings lacked — and the detail that prevents the next lintel from corroding.
- 7
Masonry restoration
We rebuild the brick courses above the new lintel, repoint all affected joints, and match the mortar color and profile to the surrounding wall. Our [brick pointing](/brick-pointing-contractors-in-brooklyn-ny/) team ensures the repaired section blends with the original facade.
- 8
Structural verification
We verify the new lintel is properly carrying the load, check that windows and doors operate correctly, and confirm the facade is plumb and visually restored. We document the work for your records and for any required NYC DOB filings.
NYC DOB requirements for lintel work
Steel lintel replacement on load-bearing walls is structural work that typically requires NYC Department of Buildings (DOB) permits. The DOB may require a licensed structural engineer to size the replacement lintel and verify that the existing wall can support the load. For buildings in historic districts, Landmarks Preservation Commission (LPC) approval may also be needed.
AK Roofing 3D handles all DOB and LPC permit requirements for lintel replacement. We coordinate with structural engineers when the scope requires it and ensure the work meets NYC building code standards.
Lintel replacement cost in Brooklyn
Lintel replacement cost depends on the number of lintels, the size of the openings, the extent of masonry damage, and whether structural engineering or permits are required. Single-lintel replacements on ground-floor windows are at the lower end; multiple lintels on upper floors requiring scaffold are at the higher end.
Cost Guide
Steel lintel replacement costs in Brooklyn depend on opening size, masonry damage, access, and permit requirements:
| Work | Typical Brooklyn range (estimate, not a quote) |
|---|---|
| Single lintel replacement (standard window) | $500 -- $1,500 |
| Single lintel replacement (large opening / door) | $1,000 -- $2,500 |
| Lintel replacement + brick repointing (per lintel) | $800 -- $2,000 |
| Multiple lintels (per building, 3-6 lintels) | $3,000 -- $10,000 |
| Lintel + full facade repointing (one elevation) | $5,000 -- $15,000 |
| Structural engineering assessment (if required) | $500 -- $1,500 |
Free estimates include on-site inspection. Pricing varies with access height, masonry condition, and whether DOB permits or structural engineering are required.
Frequently Asked Questions
What happens if I don't replace a rusted lintel?
Rust jacking continues to expand, pushing more brick courses out of alignment. Eventually, the displaced masonry can fall — creating a serious safety hazard for anyone below. The structural integrity of the wall above the opening degrades, and the damage spreads to adjacent masonry. Prompt replacement prevents escalating damage and liability.
How long do galvanized steel lintels last?
Galvanized steel lintels typically last 40 to 60 years or more when properly installed with flashing. The galvanized coating protects the steel from corrosion even when moisture is present. Proper flashing installation — directing water away from the lintel — is the key factor in longevity.
How much does lintel replacement cost in Brooklyn?
A single standard-window lintel replacement runs $500 to $1,500. Larger openings or doors cost $1,000 to $2,500. Multiple lintels on a building run $3,000 to $10,000 depending on scope. A free on-site estimate gives you an accurate number for your specific situation.
Do I need a DOB permit for lintel replacement?
Yes, typically. Steel lintel replacement on load-bearing walls is structural work that requires NYC DOB permits. The DOB may also require a licensed structural engineer to size the replacement lintel. Buildings in historic districts need additional LPC approval. We handle all permit requirements as part of the project.
Can lintel rust be repaired without full replacement?
In very early stages, surface rust can be cleaned, treated with a rust inhibitor, and painted to slow further corrosion. However, once rust jacking has begun — meaning the steel has expanded enough to displace masonry — cleaning and painting will not reverse the structural damage. Replacement is the correct solution.
Will the new lintel match my existing brick?
The galvanized steel lintel is hidden behind the masonry — only the end of the angle may be visible in some buildings. The brick we install above the new lintel is color-matched to your existing facade, and the mortar joints are profiled to match. Our [masonry contractor in Brooklyn](/masonry-contractor-in-brooklyn-ny/) ensures the repair blends with the original wall.
How do I know which lintels on my building need attention?
Look for rust stains below window and door openings, cracks running through the brick above openings, windows that stick or won't close, and any visible displacement of the masonry. A professional inspection identifies lintels that are corroded but not yet showing obvious external signs — catching problems before they become dangerous.