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Uneven Pool Deck
Your pool is an area of your home where relaxation and fun should be on your mind - not an uneven or cracked pool deck. Settling pool decks often result from being installed over soil that was not tightly compacted. Over time, the backfilled soil compresses and the pool deck above begins to settle, creating unlevel concrete and the problems it brings.
How did this happen?
Changes in soil moisture
Concrete is most often poured directly onto soil. It hardens and seems strong and permanent. However, the soil under the concrete can move over time due to changes in moisture. Different types of soils, especially clay, hold on to water and expands. When dry conditions occur, the soil contracts. This expanding and contracting creates empty spaces into which your concrete pool deck and patio settle, causing cracks.
Wash-out of soil
As water moves beneath your concrete slab, stairs, sidewalks or patio, it can wash away the soil that's supporting the weight of the concrete. This can be caused by plumbing leaks, erosion, heavy rains and many other reasons. Over time, with nothing left to support the concrete, it will begin to sink or cave in.
Poorly compacted fill soil
During the installation of a pool, soil is commonly moved around or spread out to get to the desired grade level on the surrounding area, where the pool deck will be poured. If the fill was poorly compacted, the fill soil compresses and settles, creating a void under the concrete. With nothing to support it, the concrete can crack, break or become uneven as it settles into the void.