Water proofing the floor starts at the top. My 2004 Attrium had a tile floor sealed at the edges and I have never had a problem. When at replaced the flooring throughout my coach, I used luxury vinyl planks glued down. Not the snap together stuff. This was also sealed at the edges with silicon caulk. Doing all the waterproofing to the plywood is not a bad idea, just remember to seal whatever flooring you used or the plywood will still rot with water damage.
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