Working on a tight budget here, I'm trying to repair a small, walk-in curbed shower on the ground floor of our home in Texas (no basement). The grout in the curb tiles had cracked, the tiles themselves seemed suspiciously flexible and poorly supported, and the grout in the shower wall tiles...

Hey all - In the midst of a master bath reno.. (http://www.diychatroom.com/f49/condo-master-bathroom-reno-demo-bathtub-shower-conversion-flooring-98814/) Preslope is down, liner is down... about to put in shower mud to complete the base. A few questions: 1) Should I install the CBU first...