That one was a 2000mm x 850mm shower area ( mosiac tiled ) and the glass was iirc 1400mm long. Aluminium wall profile can be seen in the second pic, but I always bond the glass straight down to the tiled floor with clear CT1 as bottom channels look rough as toast and harbour water, grot and worse.  Point being, you don't need anything complicated, but you do need to do a good job of fitting the screen. Masking tape either side of where the glass will hit the floor / tray, smear a bit o
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