The base of the shower side walls on many RV's, including ours, is loose and does not adhere to the side wall. It probably hasn't come loose - it is installed so that it overlaps the lip of the shower floor basin and is not glued or clipped to anything. The shower floor, if you were to look at it, has a lip that extends upward against the wall. The shower sides extend over this lip but do leave a "gap" between the two.
Some members have applied silicone caulking to this gap as a means of preventing any water from splashing up and over the lip. I've never done this with our shower and have not yet experienced any issues.
The water, during showering, runs down the sides without splashing up into the gap. There is enough of an overlap to prevent this from happening.
If you are concerned, apply silicone to the gap.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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