We connect property owners in Buffalo and nearby areas, including North Buffalo, South Buffalo, Elmwood Village, Allentown, Amherst and Cheektowaga, with one independent local foundation repair specialist.
What it costs
Typical published ranges for Buffalo. The contractor's written estimate is the price, and the inspection is free.
"Water drips through a crack in my basement wall.".
"There is a crack and it looks wider than last year.".
"I have a long sideways crack across my block wall.".
"The block has cracked in a stair-step pattern.".
"There is a crack in the floor and water comes up in spring.".
"The home inspector flagged a crack and the buyer wants it fixed.".
"Mortar is falling out of my stone foundation.".
Why Buffalo walls crack
Frost
NOAA engineering data for Buffalo lists a 50-year frost depth of 59 inches, with about 53 freeze-thaw cycles in an average year. Every freeze swells wet soil against the wall. Every thaw lets it settle. That back-and-forth opens small cracks and makes old ones wider.
Clay soil
Buffalo is built on the bed of old glacial lakes. Much of the soil is clay. The U.S. Army Corps of Engineers found that the lake-bed clay in Amherst has medium to high swell potential. Soil pushing in from the side caused most of the wall damage in the study.
Old walls
About 61 percent of homes in the city were built in 1939 or earlier. Stone walls crack along the mortar joints. Early block walls crack along the joints too, often in a stair-step or sideways line.
Concrete shrinkage
Poured walls shrink a little as they cure. That leaves thin vertical cracks in many newer Buffalo basements. They are often harmless, but they are a common path for water.
What your crack means
Use this table as a rough guide.
What you see
What it often means
Thin vertical crack, poured wall, dry
Shrinkage, usually cosmetic
Thin vertical crack that leaks
Water path, seal it
Crack wider at the top or bottom
Wall or footing movement
Long sideways crack across a block wall
Soil pushing the wall in
Stair-step crack in block or brick
Settlement or side pressure
One side of the crack sticks out
Wall is bowing, call soon
Crumbling mortar in a stone wall
Old mortar breaking down
It is not a diagnosis. The inspector checks the whole wall, not just the crack.
Repair methods
Foam injection
The crew sets small ports along the crack, seals the surface and pumps in a liquid foam. It expands to fill the crack all the way through the wall, then stays flexible. This is the most common fix for a leaking crack in a poured wall.
Epoxy injection
Epoxy goes in the same way but cures hard. It bonds the two sides of the crack back together. It is used when the crack needs strength as well as a seal. The wall must not still be moving.
Block and stone joints
Block and stone walls cannot be injected like poured concrete. Their cracks follow hollow cores and loose joints. The crew may repoint the joints with new mortar or add an inside drain to carry off water. If the wall is moving, they may brace it.
Cracks from a moving wall
Some cracks come from a wall bowing in. Sealing those will not last. The wall needs to be braced first. See bowing wall repair.
Many leaks at once
Sometimes water comes in at many cracks or along the base of the wall. Then an inside drain and sump pump often costs less than sealing each crack. See basement waterproofing.
What a good crack inspection covers
Width, length and direction of every crack.
Whether one side is out of line with the other.
A check of the wall for lean or bow.
Signs of water: stains, white crust, damp block.
The sump pump, gutters, downspouts and grading.
A written plan: seal, brace, drain or a mix.
The cost table on this page shows typical published ranges from the Fixr and This Old House 2026 cost guides, not a quote.
Frequently asked questions
Are hairline cracks in my basement wall normal?
Thin vertical cracks in a poured wall are common. They form as concrete dries and shrinks. A crack that stays thin, dry and the same size is often only cosmetic. Mark the ends with a pencil and the date. Call if it grows or leaks.
Which cracks should worry me?
Watch for cracks wider than about a quarter inch, or wider at one end. Sideways cracks across a block wall and stair-step cracks matter too, as does any crack where one side sticks out past the other. Those can mean the wall is moving.
Can I fix a foundation crack myself?
You can patch a dry hairline crack with a store-bought kit. A leaking crack usually needs foam pushed all the way through the wall, which takes pressure equipment. A crack from a moving wall needs bracing, not a patch.
Why do cracks in Buffalo leak in spring?
Snow melt soaks the clay soil around your house. The ground below is still frozen, so the water cannot drain down. Pressure builds against the wall and finds every crack. A crack that is dry in August can run in March.
Epoxy or polyurethane, which is better?
Epoxy bonds the crack shut and can add strength. Polyurethane foam stays flexible and grows to fill the crack. That makes it a common choice for leaks. The inspector picks based on whether you have a leak, a structural crack or both.
How long does crack injection take?
Most single cracks are done in a few hours, with no digging. The material cures over the next day or so.
Will the crack come back?
A well-sealed crack usually stays sealed. New cracks can still form if the wall is moving or if water keeps building up outside. Ask what the warranty covers.