Summary for owners and boards
- Patios, walkways, driveways and pool decks are thin slabs laid on the ground with little or no connection to the house foundation. They crack more readily, and a crack in flatwork usually says more about the soil and water near the surface than about the structure.
- Patterns matter. A clean shrinkage crack is a different matter from a slab that has dropped or tilted toward the house.
- The residential code asks for hard surfaces within ten feet of a foundation to slope away from the building at two percent or more. Flatwork that slopes the wrong way sends water toward the foundation.
- Not all concrete in front of a home is private. The portion of a driveway in the public right-of-way needs an encroachment permit, and the City says the edge of the pavement isn’t necessarily the property line.
- Lot owners still carry a maintenance duty for the sidewalk in front of their lot under City code and state law.
1. Why exterior slabs are the first to show it
Flatwork is usually a few inches of concrete over compacted soil, sometimes with light reinforcing, sometimes with none. It sits at the surface, where soil moisture swings the most. Irrigation, roof runoff, a slow irrigation leak or a tree’s root zone can all change the ground under a patio long before anything changes under the house.
That’s why the outdoor concrete is often where the first evidence appears. It isn’t automatically a structural concern. It is information.
2. A pattern guide
When documenting flatwork, describe what you see in these terms:
- Thin, straight cracks, edges level. Typically shrinkage as the concrete cured. Common and usually cosmetic.
- Cracks meeting at a corner or re-entrant angle, such as where a walkway turns. Stress concentrates at corners. Usually cosmetic unless offset develops.
- One side higher than the other. A vertical offset means something moved. Note how much, and whether it is growing.
- A panel tilted toward the house. This one matters because it reverses drainage.
- A gap opening between the slab and the house wall or a step. Two independent pieces moving differently. Water can enter the gap.
- A sunken section near a downspout, planter or pipe. Often erosion or settlement of the soil underneath.
- Raised, humped panels near a tree. Root pressure is a common cause, discussed in our briefing on tree roots.
Photograph each one with a tape measure in frame, note the date, and recheck after the first significant rain.
3. The two-percent slope near the walls
The state residential code requires lots to be graded so surface water drains away from foundation walls. It also says impervious surfaces within ten feet of the building foundation must slope at least two percent away from the building. In plain terms, a patio next to the house should fall away from it, roughly a quarter inch per foot.
Settled flatwork can lose that slope or reverse it. When a patio begins draining toward the house, water collects at the slab edge or the foundation, and the conversation shifts from surface cracking to foundation drainage. Boards should give this condition priority, because it can affect the buildings, not just the walkway.
4. Where private concrete stops
The City’s engineering FAQ makes several points owners often don’t expect:
- For a driveway, the portion within the public right-of-way requires an encroachment permit.
- For standard construction, only a properly licensed and insured contractor may work in the public right-of-way.
- The edge of the pavement is not necessarily the property line. The actual boundaries come from records of survey or the legal description on the grant deed, which a licensed surveyor can interpret.
Before replacing a driveway apron or a walkway that reaches the street, it is worth confirming where the property line actually runs.
5. The duty attached to the sidewalk
Solana Beach’s sidewalk chapter says the owners of each lot fronting a public street with a sidewalk are to maintain that sidewalk so it won’t endanger persons or property or interfere with public use, including keeping it free of litter. State law sets out a similar duty for owners of lots fronting improved public streets. Both carve out conditions created by someone else working under a permit, who then carries the duty for that condition.
This doesn’t decide every case. It does mean that a lifted panel in front of a property shouldn’t be assumed to be solely the City’s concern.
6. Water arriving from next door
Associations and owners sometimes find a neighbor’s runoff crossing their patio or undermining a walkway. The City’s FAQ is direct: unless the drainage problem results from a grading violation, it’s a civil matter between neighbors. If a grading violation is suspected, the City’s Engineering staff is the contact. Documentation of where the water comes from, during a rain, is the most useful evidence either way.
7. Common-area flatwork in associations
For HOAs, common walkways and pool decks raise two additional concerns. First, trip hazards. A vertical offset on a heavily used path is a safety item regardless of cause. Second, pattern across the property. If several buildings show the same tilt toward foundations, that suggests a site drainage issue rather than isolated concrete problems, and it may belong in the association’s longer-range planning.
8. Repair choices, from least to most involved
- Seal and monitor. For cosmetic shrinkage cracks, routing and sealing keeps water out.
- Grind or ramp offsets to address trip hazards while monitoring continues.
- Fix the water first. Redirect downspouts, adjust irrigation, repair leaks, then decide on the concrete.
- Lift or re-level panels that have settled, when the soil beneath has stabilized.
- Remove and replace sections, restoring the correct slope away from the building, with joints placed to control future cracking.
- Investigate further when flatwork distress lines up with cracks inside the home or in the slab foundation.
When flatwork findings point to the building, we coordinate with licensed engineers as needed.
9. Variables behind scope
Area and thickness of the concrete, access for equipment, whether drainage corrections are included, whether any work falls in the right-of-way, the number of buildings in an association, and whether the soil or foundation needs separate evaluation. Our foundation cracks page helps owners compare exterior and interior cracking.
Board checklist
- Photograph and date each crack type, with a tape measure in frame.
- Flag every panel that drains toward a building.
- Treat vertical offsets on paths as safety items.
- Confirm property lines before replacing concrete near the street.
- Correct the water source before replacing concrete.
- Escalate when exterior and interior cracking appear together.
We serve all of Solana Beach. For a review of a home’s or an association’s exterior concrete, request a Free Quote.