Are you sure its coming up from below? On a coach I had several years ago the skylight over the shower cracked. Its a double skylight and only the exterior was broken and I didn't notice it from inside. Rain ran down the inside of the bathroom wall and onto the bedroom floor.
Also one time during noreaster conditions on the east coast rain forced its way into the BR slide, ran down the back side of the slide enclosure and onto the floor.
Water has a funny way or entering one place and showing up someplace else.
Chuck & Pam (the people) - Bobbie the Cat
2016 Tiffin Allegro 32SA & Nissan Frontier