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Moss likes an acidic soil, shade, and lots of moisture. Take away one or or all. I am guessing you can't do much about the shade.

Kill it off with a weed killer, but to keep this problem from...

I installed a shower stall a year ago. It has begun to leak.

It is on the second floor, and I was able to open the ceiling just below it to see. The water is leaking from around the drain...