The licensed plumber, Sherwin, arrived at my home determine why my bathroom floor to determine why my tiles were cracking and why there was always water on the floor. He assessed that there was a sub floor and my toilet was leaking thus cause the tiles on top to crack and leak water. I had no idea there was a subfloor! He quickly fixed the leak and I will call him to remove/replace the toilet when we redo the tiles. He was professional and very helpful!