I have a gap between the drain and the cultured marble flooring hole that is allowing water to get between the floor and the liner. I tore everything out (the drain and the silicone and everything else to get to the problem. There was standing water between the cultured marble and the rubber liner. I vacuumed it all out and now I don't know how to fix the problem. There is a couple inch gap between the liner, but they didn't concrete all the way to the drain and I can pretty much fit my whole hand in the gap. I am wondering if I could use a concrete product to finish filling in the gap to give it more of a barrier and then silicone the top, but as of right now, there is too big of a gap and there is no way to keep the silicone from just shrinking and the problem to continue. I put the picture of the drain to show the gap between the cultured marble hole and the standard 4 inch drain.