Summary for owners and boards
- A crack repair should follow a diagnosis. The same crack can call for different repairs depending on its cause and whether it’s still moving.
- Transportation agencies separate crack work into two goals: keeping water and chlorides out, and restoring structural continuity.
- Epoxy injection is a skilled process with real limits on crack width, cleanliness and moisture.
- Near the coast, cracks that show rust staining or loose concrete are often a corrosion problem first and a crack problem second.
- Boards should tie crack repairs to the reserve study’s visual inspection and keep records of what was done where.
Start with why it cracked
Concrete cracks for many reasons. It shrinks as it cures. It moves with temperature. It cracks when the ground under it settles or swells, when it’s overloaded, or when embedded steel rusts and expands. In Solana Beach, with salt air reaching most of the city, that last cause comes up more often than owners expect.
Each cause leads to a different repair. Sealing a crack that opened from drying shrinkage can be the end of the story. Sealing a crack over settling soil only hides the next round of movement. Patching over corroding steel without dealing with the steel tends to fail at the edges.
So the first question a board should ask about any crack repair proposal is simple: what caused this, and is it still moving? If no one can answer that, the repair is premature. Our foundation cracks page outlines how cracks are read, and slab cracks in Solana Beach covers floor slabs specifically.
Two goals: seal it, or make it whole again
Public agencies that repair a lot of concrete are useful guides here, because their specifications are written plainly and tested on thousands of structures.
The New York State Department of Transportation splits its epoxy injection work into two items. One is crack sealing for prevention, used where concrete is cracked and contaminated, to limit movement and protect reinforcing. The other is crack repair for restoration, used in uncontaminated cracked concrete to restore structural integrity, with verification cores taken to check penetration.
The Texas Department of Transportation’s Concrete Repair Manual describes the same two purposes in one sentence: pressure-injecting low-viscosity epoxy into cracks either to restore the structural integrity of damaged members or to prevent water and chloride infiltration.
That distinction is worth borrowing. When a contractor proposes a crack repair, ask which goal it serves. A sealing repair and a structural repair are specified, tested and documented differently.
The main repair families
Surface sealing and routing
For cracks that aren’t structural and aren’t moving much, the usual approach is to seal the surface so water and salts can’t get in. Sometimes the crack is routed, or widened into a shallow groove, and filled with a sealant. It’s the least invasive option, and on flatwork and garage slabs it’s often enough.
The limit is that sealing addresses the surface. It doesn’t bond the two sides together, and it won’t stop movement from soil or loading.
Pressure-injected epoxy
Epoxy injection fills a crack through its depth and bonds the sides back together. TxDOT’s manual walks through the process: clean the crack, set injection ports along it, seal the surface between the ports, then inject from the lowest port upward on vertical surfaces until resin appears at the next port. If resin doesn’t reach the adjacent port, the crew stops and reevaluates.
A few limits stand out in that manual:
- Width. Depending on the resin, cracks as narrow as about 0.002 inches can be injected, but cracks narrower than about 0.005 inches are often hard to fill well. A crack gauge, not an eyeball, should measure them.
- Cleanliness. Dust and debris inside the crack can block the resin. The manual cautions against grinding a groove along the crack in most cases, because grinding can push dust in.
- Moisture. The crack and surface need to be dry before sealing and injecting.
- Skill. The manual’s commentary says injection takes a great deal of skill and expertise, and recommends training from the resin manufacturer or a specialty firm.
Injection also assumes the crack has stopped moving. A rigid repair across an active crack tends to crack again beside it. That’s another reason the diagnosis comes first.
Patching and partial-depth repair
Where concrete has spalled, delaminated or broken out, the repair is removal and replacement of the damaged concrete rather than crack filling. Near the coast, that frequently means exposing corroded reinforcing, cleaning or replacing it, and rebuilding the section. Our briefing on salt air, spalling and rust stains explains why a crack with a rust stain is a different problem, and the concrete spalling page covers repair approaches.
Monitor and wait
Sometimes the right answer is no repair yet. A crack with an unknown cause or an unknown rate of change is a candidate for monitoring: mark the ends, measure the width at fixed points, photograph it on a schedule, and revisit. That record is what makes a later repair decision defensible.
When a crack is a symptom
Some cracks point past the concrete itself. Boards should treat these as a reason for a structural evaluation rather than a repair bid:
- Cracks with one side offset higher than the other
- Cracks that keep widening between inspections
- Cracks paired with sticking doors, sloping floors or separated trim
- Cracks in retaining walls, foundations or structural slabs near the bluff edge
- Cracks with rust staining, hollow-sounding concrete, or exposed steel
Movement under a building, in particular, needs to be explained before anyone fills a crack. Our companion briefing on settlement causes to rule out goes through the usual list.
When an evaluation shows the cause is structural or soil-related, the repair design has to come from the right professionals, and contractors coordinate with licensed engineers as needed. Some repairs also need a permit. The City’s Building Services division is the place to ask what applies to a given scope.
Where the board’s duties come in
For associations, crack repairs connect to an existing legal duty. California Civil Code section 5550 requires the board to have a reserve study done at least once every three years, including a reasonably competent and diligent visual inspection of the accessible areas of the major components the association must repair, replace, restore or maintain.
That inspection is a natural time to log cracks in common-area concrete: garages, walkways, decks, walls and podiums. A crack log tied to the reserve study gives the board a baseline, and it lets the next study show whether things changed. We wrote more about that link in reserve studies in Solana Beach. For multi-unit buildings, our HOA and condo structural repair page covers how evaluations are usually scoped.
Numbered takeaways for the board
- Ask for the cause before the repair. A repair proposal should name the cause and say whether the crack is active.
- Ask which goal the repair serves. Sealing out water and restoring structural continuity are different scopes.
- Ask how the crack was measured. Width at fixed points, with a gauge, and photographed.
- Ask about corrosion. Near the coast, any rust stain or hollow sound changes the repair.
- Ask how the repair will be verified. For injection, that might mean cores or test areas; for patches, sounding and inspection.
- Record what was done and where. Keep the location, method, date and contractor in the association’s files.
Variables that size crack repair work
- Cause of cracking and whether it’s still active
- Crack width, length and depth
- Presence of corrosion or delamination
- Location: flatwork, slab, wall, deck or structural member
- Access, occupancy and shoring needs
- Whether engineering or a permit is required
We work with owners and boards across Solana Beach, from bluff-top buildings to inland neighborhoods. If cracked concrete is on your next agenda, ask for a Free Quote and we’ll help you sort the cosmetic from the structural.