Jurisdiction: Crack repair methods are the same across the village, Carmel Valley, and Del Mar Heights. Permits, where needed, follow the city in which the home sits.
If you’re still deciding whether a crack is significant, begin with foundation and wall cracks.
Before any repair
We answer three questions first.
Is it moving? Crack monitors, fresh edges, or change between dated photographs indicate activity. For owners who are away, a monitoring period can settle the question. See second-home structural monitoring.
Is there displacement? When one side sits higher or farther out than the other, the foundation has moved, and the repair must address support, not just the gap.
What caused it? Shrinkage, settlement, water, corrosion, or soil movement. In Del Mar, where the hazard annex rates expansive soils as a medium hazard, seasonal soil moisture is part of the conversation. Near the beach, rusting reinforcement is another.
A stable crack with its cause addressed is a good candidate for repair.
Methods
Epoxy injection. Structural epoxy is injected through surface ports and bonds the crack faces, restoring much of the section’s capacity. Suited to stable structural cracks in walls and footings, and requires a reasonably dry crack.
Polyurethane injection. A flexible, expanding resin that seals against water. Suited to damp cracks, such as a stem wall in a floodplain crawl space, where watertightness matters more than strength.
Routing and sealing. The crack is widened slightly and filled with a flexible sealant. Common for slab cracks beneath flooring and for exterior cracks.
Stitching. Steel stitches or carbon-fiber strips across the crack, used where the engineer wants to limit future opening.
Sectional replacement. Where concrete is broken, crumbling, or spalled around corroded steel, patching isn’t adequate. See salt-air concrete corrosion.
Del Mar particulars
- Older concrete. Pre-war and mid-century foundations may be unreinforced or made with weaker mixes. Injection behaves differently in old concrete, and sometimes replacement is wiser.
- Damp cracks. Where a crack is wet, epoxy may not bond until the area is dried.
- Post-tensioned slabs. In Carmel Valley, drilling for injection ports must avoid tendons. See slab foundation repair.
- Stucco and plaster. Many visible cracks are in finishes that mirror the foundation. We repair the foundation first and coordinate finish work so it matches.
When crack repair isn’t the answer
If the crack is the visible edge of ongoing settlement, the priority is foundation settlement repair. We won’t inject an active crack simply to make it presentable before a sale; it will reopen, and it hides information a buyer deserves.
Permits
Cosmetic sealing generally doesn’t require a permit. Structural repairs, particularly those tied to settlement or involving replacement, usually do. In the City of Del Mar, Planning reviews before a building permit issues; in the City of San Diego, the Municipal Code governs. We coordinate with licensed engineers as needed.
Owner questions
What is carbon fiber reinforcement?
Carbon fiber straps are bonded across a crack in a concrete or block wall to resist further opening. They are thin and can be painted, which suits finished spaces. They are appropriate once the wall’s movement has been diagnosed and found to be limited.
Can the repair be made invisible?
On foundations, largely. On stucco and plaster, a skilled finisher can blend it, though perfect matches on old finishes are difficult.
Can an earlier owner’s patch be redone?
Yes. Old patches often have to come out so the crack can be assessed and repaired properly. We note what the earlier repair was, since it can indicate how long the crack has been active.
Are cracks in a stone or brick foundation repaired the same way?
Not quite. Older stone and brick foundations are usually repointed with a compatible mortar rather than injected, and loose units are reset. Where a masonry foundation has moved, reinforcement or partial replacement may be discussed.
Arrange a Free Quote
Share photographs and the address. We’ll assess the crack and its cause. See also foundation inspection.