Foundation Crack Repair NYC
Foundation crack repair in NYC for leaking cracks in concrete basement and foundation walls. We seal them from the inside with injected resin that fills the crack through the full thickness of the wall, so water stops coming through without digging up the yard.
- Epoxy & Polyurethane Injection
- No Excavation Needed
- Licensed & Insured
What Is Foundation Crack Repair?
Foundation crack repair is the sealing of cracks in a building’s foundation walls so water can’t pass through them. For poured concrete walls, the most effective method is crack injection. Small ports are set along the crack, the surface is sealed, and a liquid resin is pumped in at low pressure until it fills the crack from the inside face all the way to the soil side. Once it cures, the path the water was using is gone.
Most foundation cracks are caused by concrete shrinking as it cures, and they aren’t a structural danger on their own. The trouble is that even a hairline crack can carry water straight through a wall during heavy rain. Injection fixes that without excavation, and it’s one of the most affordable ways to stop a basement leak when the crack is the only thing letting water in.
Foundation Crack Repair in NYC Without Excavation
Water finds the smallest openings in a concrete wall. We seal each one with the method that fits how it’s leaking.
Leaking Wall Cracks
Vertical and diagonal cracks in poured concrete sealed through the full depth of the wall.
Tie Holes & Pipe Penetrations
Leaks at old form tie holes and around pipes that pass through the foundation.
Cold Joints
The seams where one concrete pour meets another, sealed where water is getting through.
Signs a Foundation Crack Needs Repair
Water Running Down a Crack
Water seeping or trickling through a crack after rain.
A Damp Line Along the Crack
A dark, wet stripe that follows the crack down the wall.
Mineral Residue Tracing the Crack
White or crusty buildup left behind as water moves through.
Rust Spots at Small Holes
Rusty stains or drips at small round holes in the concrete.
Leaks Around Pipes
Water entering where pipes and utilities pass through the wall.
A Crack That's Getting Wider
Cracks that widen or shift over time, which should be checked.
Why Foundation Walls Crack in NYC
Understanding why a crack formed tells us whether it just needs sealing, or needs a closer look.
Concrete Shrinkage
As concrete cures, it shrinks and cracks. These cracks are common and usually not structural.
Settlement & Soil Movement
Shifting soil or uneven settling can crack a foundation, especially in older buildings.
Freeze-Thaw Cycles
Water in small cracks freezes and expands each winter, slowly opening them wider.
Foundation Crack Injection Methods We Use
Not every crack gets the same resin. The choice depends on whether the crack is leaking and whether it needs to be bonded.
Polyurethane Injection
A flexible resin that reacts with water and expands, ideal for actively leaking cracks.
Epoxy Injection
A rigid resin that bonds the crack back together, used on dry cracks where strength matters.
Penetration & Tie Hole Sealing
Leaks around pipes and form tie holes sealed so water can't follow them in.
Our Foundation Crack Repair Process
Crack injection is precise work, and most of it happens before the resin goes in.
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Inspect the Crack
We check the crack's width, direction, and whether it's leaking, and look for signs it might be structural.
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Port, Seal & Inject
Injection ports are set along the crack, the surface is sealed, and resin is injected at low pressure until the crack is full.
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Finish & Check
Once the resin cures, the ports are removed, the surface is cleaned up, and the repair is checked for moisture.
Older Stone & Brick Foundations
Injection works best on poured concrete. Many older NYC homes have stone, brick, or block foundations, which need a different approach. See basement waterproofing.
Cracks That Need an Engineer
Horizontal cracks, cracks that keep widening, or walls that bow inward can point to structural problems, and those should be reviewed by an engineer before repair.
NYC Considerations for Foundation Crack Repair
The age and type of NYC foundations shape which repairs make sense.
What Affects Foundation Crack Repair Cost in NYC
Crack repair is usually priced per crack, after we see how many there are and how they’re leaking.
Number of Cracks
One leaking crack or several across the basement.
Crack Length & Width
Longer and wider cracks take more resin and time.
Injection Material
Polyurethane for leaks, epoxy where bonding is needed.
Wall Access
Finished walls, shelving, or stored items in the way.
Tie Holes & Penetrations
Extra leak points around pipes and old tie holes.
Structural Review
Whether an engineer needs to look at the crack first.
Foundation Crack Repair Projects in NYC
Why NYC Owners Call Us for Leaking Foundation Cracks
Surface patches and caulk over a crack usually fail with the next storm, because the water is still coming through the wall behind them. We fill the crack all the way through.
Right Resin for the Crack
Polyurethane or epoxy chosen for how the crack behaves.
No Digging Needed
Repairs made from inside the basement.
Honest About Structural Cracks
We tell you when a crack needs an engineer first.
Clean, Tidy Finish
Ports removed and the wall left neat.
What Clients Say About Our Foundation Crack Repairs
Foundation Crack Repair Across NYC & Westchester
We repair leaking foundation cracks in homes and buildings throughout four NYC boroughs and Westchester County.
Queens
Poured concrete basements in houses across the borough.
Brooklyn
Newer homes and multi-family buildings with concrete foundations.
Bronx
Concrete basement walls in homes and small buildings.
Manhattan
Concrete foundations in townhouses and buildings.
Westchester
Leaking basement cracks in homes across the county.
Foundation Crack Repair FAQs
It depends on the crack. Polyurethane is flexible and reacts with water, so it's the go-to for cracks that are actively leaking. Epoxy is rigid and bonds the concrete back together, so it's used on dry cracks where restoring strength matters. We choose after looking at the crack.
Most aren't. Thin vertical cracks from concrete shrinking are common and mainly a leak concern. Horizontal cracks, cracks that keep getting wider, or walls that bow inward can be signs of a structural issue and should be looked at by an engineer.
Yes. Low-pressure injection fills the crack from the inside face all the way through the wall to the soil side, so there's no need to excavate outside.
Those are usually form tie holes, left from the metal ties that held the concrete forms in place when the wall was poured. When the ties rust or the patches over them fail, water can leak straight through. They're sealed much like a crack.
Not as well. Injection is designed for solid poured concrete. Stone, brick, and block walls have many joints and voids, so leaks through them are usually handled with interior drainage and sealing instead. See our basement waterproofing page.
Yes. Polyurethane resin is made to work in wet conditions, and it reacts with water to seal an actively leaking crack. That's often the best time to find exactly where the leak is.
A single crack is often done in a few hours. Basements with several cracks or leaking penetrations may take a day, and the resin cures shortly after.