I have an older house and was looking at one of the shower stalls
recently. The stall is tiled, but I noticed that on both sides of the
pan where the tile is met, there appear to be two notches cut in the
upper half of the pan. A sandy grit drains out when water is splashed
in the holes.
The tile needs re-grouted and some of the caulk needs updated. What
are these two notches for and/or should they be caulked shut? At
first I thought it might be where the caulk or tile had worn away, but
the notches are there for a reason, right (i.e., they are in the pan
design, not manually cut out after the fact)?