Hi All, I have a pool with pebblecrete coping that has a mind of its own. It is slowly starting to lift itself off the edge of the pool (see pic below) and I have no idea why. If I did not know any better I would say it is expanding. There is another section of the pool where it has come away in sections but these section do not fit back into their positions?? The combined sections are larger than the area they came from. Either way it needs attention. I do not know much about such things so any advice suggestion would be good. I inherited the pool with the house and I suspect it is 15 y/o??