On many pools there is a gap between the pool ledge, or coping, and around the concrete patio or walkway next to the pool. This is known as the expansion joint. This gap averages 1/2 to 3/4 inches and usually sealed with a high grade caulk. In the northeast and Mid-Atlantic U.S. it is critical to keep this gap filled since water can pour in and over time lift the pool out of the ground or cause cracks. Also, the pool or concrete can shift coming into contact with each other and crack the beam. This is usually seen in broken tiles.
After fifteen years it is not unusual for the caulk originally placed in the joint to rot away or develop gaps. Replacing this caulk is not an easy job and should not be undertaken lightly.
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