leak prevention

I'm looking for some clarification if the poly line running under this new tile floor was cut by the sharp tile (underneath). The tile guy is not taking any responsibility for this line being cut by the sharp tile. I have seen tile cut a poly/PEX line in the past and that is why tile guys...

We have had a large number of leaks into our apartment and just when we thought they were all fixed we get two simultaneous leaks at either end of our apartment. Thankfully we quickly got to the bottom of the first leak as it comes from a waste line in the apartment above which is currently...