Have you ever built something with blocks and noticed that if the bottom is not strong, everything falls apart? Floors work in a very similar way. Even if tiles look strong on top, what is under them is very important. One special hidden layer called an uncoupling membrane for tile helps keep floors safe, smooth, and long lasting.
Read More: https://perfectprimer.com/a-strong-floor-starts-from-something-you-cannot-see/