If you see stains on the ceiling below your bathroom, don't assume it's from a leaking water or drain pipe. Check the ceramic tile walls surrounding your tub or shower. This tile needs periodic maintenance; cracks can develop in the grout between the tiles, allowing moisture to seep through. To stop the leak and prevent further damage to the underlying plaster or drywall, you'll need to seal all the places where water can penetrate.
Clean soap scum and mold from the entire area, and then inspect the grout between the tiles. Remove any loose pieces (with a hammer and narrow chisel, grout saw, rotary tool, or even an old flat-head screwdriver), until you get to solid grout. After thoroughly scraping and brushing out the joints, use a sponge or grout squeege to apply the new grout. (Pre-mixed grout, available in squeeze tubes or in small tubs, will probably be easiest to use.) Wipe off any excess with a damp sponge after it has set. Hex Mats
To seal the seam where the tile meets the tub or shower floor pan, scrape out and replace the old caulk. (Silicone caulk will remain flexible when the tub expands and contracts.) Seal around the faucet escutcheons and tub spout with clear silicone caulk, so water can't get behind the tiles.
Let the new grout and caulk cure completely, usually for three days. Then, liberally apply grout sealer (available at tile stores and most building materials centers) over the entire tile area, and let it set for about an hour. Wipe off the excess sealer, and your shower will be ready for use.
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