Hi All, I am new and have found a lot of your posts helpful. I am at the tailend of a bathroom remodel. I purchased a drop in bathtub (acrylic) and the GC installed the tub, and assured me this is proper installation. It is sitting on about 5" of cement. When I stand in it, it crunches and crunches. Something tells me that is not good. Previously I had a jacuzzi tub that was in this tub's place, and it had the apron front. It was cemented to the floor as well, but only about 1-2" and never made noises. Here's a pic of how the GC has my tub installed. Thanks in advance!