Posted: Fri Jan 18, 2019 3:13pm
Hi Sheila, I know I've not seen it, but I have my doubts about what your pool man says. If it was too thin concrete, then I'd guess you'd probably have been experiencing fairly drastic water loss.
I can think of another scenario. If the tiles haven't been re-grouted every few years, then water could be penetrating between them, and that water along with the pool chemicals could have weakened the concrete to the point where tiles fall off. That view would be supported if the tiles that fall off still have tile adhesive attached to them, possibly along with a bit of concrete.
I agree that it will be a major job, and not a cheap one unless the problem is just in one area. If it's all over the pool, then that would make my scenario a bit more likely.
You could still ask John, and if he's not able to help then he might know of someone who could.