Shower drain leaking, and did the builder forget something?
and the pipe seems to be in good shape without cracks or leaks, but I noticed something else (see photo 2, circled out in red):
that there seemed to be nothing between the tiles and the drain hole, no backplate or anything (lots of gunks from soap built up and filled the gap as you can tell from the picture), and is this the main reason the water seeped in between and eventually find its way to the ceiling beneath?
The google image I searched that for any square shaped cover, there seems to be a back plate cover with a round cutout meeting the circle drain and the square back plate cover would meet the surrounding tiles.
Anyone has experience can comment on the plausible cause of leak?
Btw, almost 5 years and is it still covered under warranty? If it were missing a back plate thus clearly the builder did a sloppy job.