Lintel Replacement · Mokena, IL
Lintel Replacement in Mokena, IL — Storefronts, Overhead Doors, and the Steel Nobody Inspects
Lintels are the only structural steel on most buildings that nobody inspects, nobody maintains, and everybody walks under.
Quick Answer
Emerald Masonry LLC provides lintel replacement in Mokena, IL — removing corroded steel above windows, storefronts and overhead doors, shoring and relaying the masonry, and installing new protected steel with flashing on commercial, retail and multi-tenant buildings. Licensed, bonded and insured; COI and lien waivers on request. Call (708) 288-1696.
Every building has structural steel in it. Most of that steel is inspected, painted, or at minimum enclosed and dry.
Lintels are the exception. They are the only structural members on a typical masonry building that sit permanently inside a wet wall, receive no maintenance, are invisible until they fail — and carry the masonry directly above a door people walk through.
Lintel replacement in Mokena, IL is the repair for what happens next.
Emerald Masonry LLC is a family-owned commercial masonry contractor serving Chicago and the Chicagoland suburbs, led by career masons with decades of hands-on Chicagoland experience, in commercial tuckpointing, façade and parapet repair, lintel replacement, chimney and stack rebuilds, CMU block repair, brick repair and replacement, foundation and limestone/sill repair, caulking, sealing, and commercial, residential and historic masonry restoration. Free on-site assessments — call (708) 288-1696.
Rust does not thin steel. It expands it.
This is the mechanism, and it is the reason lintel failure is so destructive relative to how little steel is involved.
Corroding steel converts to iron oxide, which occupies several times the volume of the metal it came from. A lintel sits under a load of masonry with a window or door frame beneath it, so as it swells it cannot go down. It goes up, lifting the wall it was installed to carry.
The trade calls it rust jacking, and it leaves an unmistakable signature.
What it looks like
- A straight horizontal crack in the mortar joint directly above an opening
- Rust staining bleeding down the masonry below that joint
- The course above the opening lifted out of plane with the rest of the wall
- Cracked or displaced units at the corners of the opening, sometimes stepping diagonally away
- A visible steel edge flaking or delaminating in layers at the head
- On wide spans, a measurable sag across the opening
- Doors and windows gone out of square at the head
Our post on lintel rust stains and orange streaks on brick covers reading the symptom from the ground.
Why commercial openings fail worse
Residential lintels span a window. Commercial lintels span storefronts, overhead doors, and dock openings — often twelve, sixteen, or twenty feet.
Three consequences follow:
More load. A wide span carries far more masonry, so section loss shows up as visible movement sooner.
More consequence. The masonry above a sixteen-foot overhead door is a substantial quantity of material sitting above a route people and equipment use constantly.
More water. Storefront and dock openings are typically the wettest details on a building — gutter discharge, splash-back off a walk or apron, snow melt piling against the head, and canopy and signage penetrations directly above.
Mokena, specifically
Mokena is a Will County village with three distinct building stocks, and lintels behave differently in each.
The Front Street historic core. Older masonry commercial buildings with original storefronts, stone and steel lintels, and openings that have been altered over a century of tenants. Here the lintel question frequently arrives alongside stone repair and repointing, and the brick matching is genuinely difficult.
The LaPorte Road, Wolf Road, and 191st Street commercial corridors. Mid-century and later retail, service, and light-industrial buildings with wide storefront glass, overhead doors, and dock openings — the highest-volume lintel work in the village.
The subdivisions and multi-family from the 1990s onward. Brick and stone veneer over frame, where the relevant steel is often a shelf angle as much as a lintel — a continuous support carrying the veneer, running behind the wall, and corroding out of sight. Our guide to brick veneer ties and shelf angles covers that hidden steel in detail.
Will County weather does the rest: dozens of freeze-thaw cycles a season working on steel that has been wet more often than dry for decades.
How the work is done
- Assess the whole elevation, not the one crack. Every opening on that wall is the same age, from the same steel, in the same exposure.
- Shore the masonry above the opening before anything is removed.
- Take down the masonry above the lintel carefully, salvaging units for reuse.
- Cut out and remove the corroded steel.
- Set new protected steel, correctly sized for the span and properly bedded at both bearing ends.
- Install flashing and a drip edge above the opening where the detail allows, with end dams so water leaves the wall rather than running into it.
- Relay the masonry, reusing salvaged units and blending replacements for size, colour and texture.
- Repoint with matched mortar, seal where sealant belongs, and clean down.
Materials
Correctly sized, protected steel. Mortar matched in type — Type N or Type S as the wall genuinely calls for — and matched in colour and joint profile so the repaired head does not read as a patch. Salvaged brick reused wherever sound, because nothing blends with an existing wall like the units already in it. Flashing detailed continuous with end dams, because flashing that stops short simply drains into the wall.
What drives the cost
Span width and the number of openings. Height and access — a second-floor window head needs staging a ground-level storefront does not. How much masonry must be shored and relaid. Whether the brick can be matched or has to be sourced. Whether flashing is being installed. Overhead protection at an occupied entry. Whether work must happen outside business hours. Weather windows for mortar cure.
Free on-site assessment and a written scope with every opening itemised — call (708) 288-1696.
Why it should not be deferred
A lintel is a structural member. Once the steel has lost section, the masonry above the opening is being carried by something that is no longer what it was designed to be — and it is directly above a door.
Deferral also grows the scope. A lintel caught early is a lintel, shoring, and a few courses. A lintel left five more winters is frequently a lintel plus a substantially larger rebuilt section, and on a storefront that means more of the elevation coming down and going back up.
Working with Emerald
Emerald Masonry LLC is family-owned, established 2024 and led by career masons with decades of hands-on Chicagoland experience. Licensed, bonded and insured, non-union, with COI, W-9 and lien waivers on request. We work with owners and facility teams through our commercial masonry practice, with managed portfolios through property manager services, and alongside builders via our general contractor partnerships.
Related services: lintel repair and replacement, brick repair, brick replacement, tuckpointing and repointing, and commercial masonry restoration.
For the commercial-scale version of this work, see lintel replacement on commercial buildings.
Have the elevation looked at, not just the crack
Request a free on-site assessment — or call (708) 288-1696.
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Free on-site estimates for commercial and large-scale projects.
Lintel Replacement in Mokena, IL — Frequently Asked Questions
How much does lintel replacement cost in Mokena, IL?
It is priced by scope. The drivers are the span, how many openings are involved, height and access, how much masonry must be shored and relaid, whether the brick can be matched, and whether flashing is being installed. Emerald Masonry provides a free on-site assessment and a written scope with the openings itemised.
What is the straight crack above our storefront window?
A corroding steel lintel beneath it. Rusting steel expands to several times its original thickness and cannot push down through the frame, so it pushes up and lifts the masonry. That horizontal crack across the width of an opening, often with rust staining below it, is the signature of rust jacking.
How many lintels usually need doing at once?
More than one, most of the time. Lintels on a given elevation were installed the same year, from the same unprotected steel, in the same exposure — so they corrode on the same schedule. A written scope should itemise every opening on the elevation, not just the one that cracked.
Is shoring included in a proper lintel scope?
It must be. Shoring is the temporary support placed under the masonry above the opening before the old steel comes out, and it is what holds the wall up during the swap. A lintel proposal that does not describe supporting the brick should be questioned before it is priced.
Does flashing go in with a new lintel?
Wherever the detail allows, yes. The old steel corroded because water reached it, so a proper replacement addresses the water path with flashing and a drip edge above the opening. Skipping that starts the new steel on the same clock as the old one.
Can a corroded lintel be treated rather than replaced?
Sometimes. Surface rust on steel that retains its full section can be cleaned back, treated, protected, and the masonry repointed. Once the steel has lost real thickness, is delaminating in layers, or has already lifted a course, treating it only defers the same repair — and we will tell you which one you have.
Can the work be done with the tenant open for business?
Yes. Storefront lintel work is planned around business hours, with overhead protection at the entry, staging that keeps the door usable, and the sequence agreed in writing before mobilisation.
Lintel Replacement in Nearby Areas
Other Masonry Services in Mokena, IL
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