u/Particular-Area-4259

Need help before the AM. Big shower job. We extended the shower, removed a closet, moved the drain, and replaced the subfloor. We laid the liner first, then mortar. We did the mortar in two separate sessions (vastly underestimated how much we’d need). The second layer never properly attached to the first. Thus, we demo’d and are redoing tomorrow. My partner says the liner goes first, then mortar (using deck mud), but I’m hearing conflicting opinions. I would LOVE some expert advice. Thanks in advance. (For context, photo one is us demo’ing the broken mortar bed today. #2 is freshly laid mortar last week. #3 is its current state.)