Why Your Driveway or Sidewalk Is Sinking During Summer
Summer in California brings plenty of sunshine and dry weather, but those conditions can also create problems around your home that may not be immediately obvious. One common issue homeowners notice during the warmer months is a sinking driveway, sidewalk, patio, or other concrete surface.
You may see one section of your driveway sitting lower than the rest, a sidewalk slab that has become uneven, or cracks developing where concrete sections meet. While these issues might seem cosmetic at first, sinking concrete can become a safety concern and may point to changes happening in the soil below.
Understanding why concrete sinks during summer can help you recognize the problem early and determine when it’s time for a professional inspection.
Why Does Concrete Sink?
Concrete slabs are heavy and depend on the soil underneath them for support. When that soil shifts, settles, washes away, or loses volume, empty spaces can develop beneath the slab.
Without consistent support underneath, the weight of the concrete can cause portions of the slab to settle into those spaces.
Several conditions can contribute to sinking concrete, but California’s hot and dry summers can make certain soil-related problems especially noticeable.
1. Dry Soil Can Shrink During Hot Weather
One of the biggest factors behind summer concrete settlement is soil shrinkage.
Many areas of California have soils that expand when they absorb moisture and shrink when they dry out. During extended periods of summer heat with little rainfall, moisture can evaporate from the soil around your property.
As the soil dries and contracts, it can pull away from the concrete above it. This loss of support can eventually allow sections of your driveway or sidewalk to settle.
The effects may be especially noticeable after an unusually wet winter or spring followed by a long, hot summer. Repeated cycles of wet and dry soil can contribute to movement over time.
2. Poorly Compacted Soil Can Settle
Not every concrete settlement problem is caused by current weather conditions.
When a driveway, sidewalk, patio, or other concrete slab is originally installed, the soil beneath it should be properly prepared and compacted. If the fill soil was not adequately compacted, it can slowly settle under the weight of the concrete.
Summer conditions may make this existing weakness more noticeable as the surrounding soil dries and changes volume.
3. Water Can Wash Away Supporting Soil
It may seem surprising to talk about water during California’s dry season, but drainage problems can contribute to sinking concrete year-round.
Sprinklers, irrigation systems, leaking pipes, or improper drainage can allow water to travel underneath concrete slabs. Over time, moving water can erode or wash away the soil supporting the concrete.
Once a void develops beneath the slab, the concrete can crack or sink into the unsupported area.
If you notice sinking concrete near a downspout, irrigation line, or frequently wet landscaping area, drainage may be part of the problem.
4. Tree Roots Can Affect the Soil
Large trees can also influence soil moisture around your driveway and sidewalks.
During hot summer weather, trees draw significant amounts of moisture from the surrounding soil. As moisture levels decrease, certain soils may shrink and create movement beneath nearby concrete.
Tree roots themselves can also affect sidewalks and other slabs, sometimes lifting one area while neighboring sections settle. The result can be uneven concrete and noticeable trip hazards.
Signs Your Concrete May Be Settling
Sinking concrete doesn’t always happen all at once. In many cases, homeowners first notice relatively small changes that become more pronounced over time.
Watch for signs such as:
- Uneven sections of driveway or sidewalk
- Cracks between or across concrete slabs
- One side of a slab sitting lower than another
- Water pooling in areas where it didn’t before
- Gaps forming between concrete and nearby structures
- Steps, patios, or walkways that appear to be tilting
- New trip hazards along sidewalks and pathways
If you’re noticing several of these signs around your property, it may be worth having the area professionally evaluated.
Why You Shouldn’t Ignore Sinking Concrete
A slightly uneven driveway or sidewalk might not seem urgent, but settlement can create larger problems over time.
Uneven sidewalks and walkways can become trip hazards for your family, guests, or anyone visiting your property. Sinking concrete can also change the way water drains around your home, potentially directing runoff toward areas where you don’t want excess moisture.
Cracks and uneven surfaces can also worsen as the supporting soil continues to move.
Addressing the underlying cause of settlement is important because simply patching a crack doesn’t restore the support beneath a sinking slab.
Can Sinking Concrete Be Repaired?
In many cases, yes.
Depending on the condition of the concrete and what is causing the settlement, it may be possible to stabilize and lift the existing slab rather than removing and replacing it entirely.
A professional inspection can help determine what’s happening beneath the concrete and identify an appropriate repair solution.
The sooner settlement is evaluated, the better your chances of addressing the issue before additional movement or damage occurs.
Schedule Your Free Inspection with Foundation Repair of CA
If your driveway, sidewalk, patio, or other concrete surface appears to be sinking this summer, don’t wait for the problem to get worse.
The team at Foundation Repair of CA can evaluate your concrete, identify potential causes of settlement, and recommend a solution based on the conditions at your property.
Call Foundation Repair of CA today to schedule your free inspection and estimate. We’ll help you understand what’s happening beneath your concrete and what can be done to create a safer, more stable surface around your home.
