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If not properly detailed, tile shower pans are prone to leaking at joints in the curb, benches, niches, and knee walls, at the shower-valve escutcheon, and at the drain. We see shower failures all the time, and frequently the toughest part is deciding how far we need to go to fix it. We can be certain we're fixing all the problems if we demolish the whole thing and start over, and often that's the right solution. But sometimes a less aggressive approach can work, saving customers time, hassle, and money.
This was illustrated on a recent job where the customer had a ceiling leak. When we arrived, the plumbers had already cut a hole in the ceiling directly below the shower drain. Judging from the calcium buildup in the leak area (including stalactites a couple of inches long), this leak was a longstanding one.