Showing a mistake I made when grouting the tile. In a rush to finish this shower, we accidentally grouted the line where the tile meets the pre-fab Delta shower pan. This turned out to be a big mistake, as the shower pan flexed slightly and caused the grout to crack, allowing water to get back there and get into the concrete backer board and grout. Luckily we caught it quickly, otherwise this would be terrible! Use silicon caulk! (paid links)

Clear silicon caulk:
https://amzn.to/409U0Im

Caulk tool kit $15:
https://amzn.to/3jlvNy1

Installation of Delta Classic 400 shower pan:
   • Delta Classic 400 Shower Pan Install