Is it a tub/shower combo? If so, those walls are fastened w/ some sort of press fastener, and the bottom of them are sort of open; that is, do not caulk or otherwise seal the bottom edge of them. The tub has a riser edge behind the wall.
Mike, Kim, and Pepper
(Min Pin security)
Current TT: 2012 Eagle Super Lite 308RETS
Current Hitch: Equal-i-zer 1400/14K
Current TV: 2010 Chevy 2500HD, CC, LB, Duramax/Allison