You can imagine our horror when we discovered mold on the outside walls of our basement bathroom. We were even more horrified when we noticed water trickling to the drain in the adjacent laundry room. I was not pleased considering it was renovated in 2005.
We replaced the rotting 2x4's in the shower and releveled the floor so it slanted better towards the drain. We then applied waterproofing membrane and backer board. Sealed nice and tight now!