A friend just told me his swim­ming pool expanded and cracked this win­ter and he needs to fix it. Can you explain this and how I can avoid it?

The best way to illus­trate how the power of water expan­sion is to show you the photo below. The rock that once sat directly on the ground has been lifted more than two inches by these frozen crystals.

Now, think about your pool and what could hap­pen when freez­ing hap­pens. When the proper drainage is not installed, the water that pools there can freeze and lift the entire pool deck. The result of this expan­sion and con­trac­tion is, obvi­ously, severe stress on the con­crete struc­ture, which can lead to crack­ing.  This is prob­a­bly what your friend was deal­ing with.

A sim­ple hair­line crack may not mean a leak and can usu­ally be eas­ily repaired. If a crack is more seri­ous and is a struc­tural con­cern, it must be sta­bi­lized to pre­vent it from get­ting big­ger and caus­ing leaks. Depend­ing on the sever­ity, we can pres­sure grout beneath the pool to sta­bi­lize and fill voids.  We rein­force cracks and repair the shot­crete shell before installing a new bond coat and surface.

If you notice any kind of a crack in your pool, call and sched­ule a free con­sul­ta­tion to deter­mine the best way to han­dle it.



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