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1. The layer of pebblecrete that was applied to your pool when it was first built was too thin, and this usually occurs over the edge of the stairs in the pool.

Pebblecrete applied to the wall is usually 7-10mm thick. The thickness drops when the surface applicators apply it up and over the stair edge, leaving a skinny layer on the stair edge. This can eventually crack after exposure to chemicals and foot traffic.

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2. On the day the pebblecrete was applied to the pool concrete shell, the day's temperature may have been too hot, causing the concrete mix to dry out too quickly, forming a hairline crack. Applying any pool surface first thing in the morning or late in the afternoon when temperatures are lower is always advisable for proper curing without rapid drying out of the aggregate mix.

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3. The pebblecrete mix was made too bony.

A bony mix is when there are too many pebbles and insufficient concrete to bind the mix together. A bony mix is very weak and can be brittle. Consisting mainly of pebbles, not concrete.

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4. The pool water pH was not maintained.

The water becomes corrosive if the pool water pH falls low (becomes acidic) over an extended period. The result is that the concrete that binds the pebblecrete together is eaten away, resulting in worn patches and cracks.

 

5. ​When first applied to the pool, an air bubble was in the pebblecrete mix.

You may first notice this as a spot or line of white calcium. The calcium is being drawn out by the water in your pool from the concrete shell behind the pebblecrete. Over time, water builds up between the pool shell and the pebblecrete layer, causing delamination. Delamination is when the pebblecrete comes away from the concrete pool wall.

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6. The pool was left empty without water for an extended period.

The pebblecrete has since expanded and contracted with the day's heat, causing it to crack and delaminate.

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7. General wear and tear.

Over the years of owning a pool, the pebblecrete has been exposed to corrosive chemicals, pool cleaners, and foot traffic, and it has worn down to the concrete shell cracked.

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It’s always better to get onto pool repairs sooner rather than later; otherwise, more damage could occur to your concrete pool, such as concrete cancer or delamination. We also supply repair kits if you want to try one of our DIY Pebblecrete Repair Kits.

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