You shouldn't even need all those layers. I use a single layer of uhaul padding under a fleece pad that has fleece on two sides and a layer of uhaul pad in between. The coroplast is never wet. There might be a bit of dampness in spots where they lay for a long time but I wipe it all down with 50/50 vinegar and water when I clean the cage so it doesn't matter.
The other reason i have this many layers is because my floor stays really cold so it will provide more insulation for their little feet not to mention a heat pad (yes its mean for pets) i put under one of their houses