Concrete pool decks crack for many of the same reasons other slabs do, such as shrinkage, temperature movement and settling soil, but pool decks also deal with constant water, splash-out and drainage around the pool. The pattern and location of the cracks help point to the likely cause, which should be confirmed in person.
Some cracks are cosmetic and stable. Others signal movement or water problems that are worth addressing before they grow.
Everyday Causes of Cracking
Concrete shrinks as it cures and expands and contracts with temperature. Pool decks sit in full sun much of the year, so they can heat up during the day and cool off at night. That repeated movement stresses the slab. Joints help control where cracks form, but random cracks can still appear, especially if joints are missing or spaced too far apart for the slab.
Hairline cracks that stay the same size over many months are often related to this kind of normal movement and may be mostly cosmetic.
Water and Soil Around the Pool
Pool decks get wet constantly from splash-out, rain and cleaning. If water drains toward the pool, collects in low spots or soaks into gaps, it can reach the soil underneath. Wet soil can soften, settle or wash out, and the deck above may crack or sink.
The area around a pool is often backfilled after the pool is installed. That backfill can settle over time if it wasn’t well compacted. North Carolina’s heavy rains can add to the water reaching that soil.
Where the Deck Meets the Pool
The joint between the deck and the pool edge or coping is a common trouble spot. The pool and the deck can move differently, and if that joint isn’t sealed or has worn out, water can get underneath. Cracks running along or out from the pool edge often deserve a closer look.
Some patterns suggest more than surface stress:
- cracks that keep widening,
- sections that have dropped or tilted,
- gaps opening between the deck and coping, and
- water collecting in new places after rain.
What Can Be Done
Small, stable cracks may be sealed or repaired. Resealing the deck-to-pool joint and correcting drainage can help prevent new damage. When sections have settled or the deck is broken in many places, larger repairs or replacing parts of the deck may be more practical. If the deck surface is worn but stable, our page on concrete resurfacing explains when a new surface layer can help.
Because cracks near a pool can relate to the pool structure, plumbing or drainage, the cause should be checked before deciding on a fix. Pool equipment and plumbing questions may also need input from a pool professional.
Our concrete pool deck services look at cracks, drainage and the deck-to-pool connection together. If your Burlington pool deck is cracking, we can take a look and recommend practical next steps.
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