A leak around a tub spout or faucet handle is usually caused by worn parts inside the valve, like a cartridge, washer, or O-ring. Gaps or cracked caulk behind the spout or handle trim can also let water run into the wall, even if you cannot see a drip.
Leaks at the Handle
The handle is attached to a valve inside the wall. Rubber seals and O-rings around the valve stem keep water from slipping out. As those seals wear, water can leak around the handle when the faucet is on. A cracked cartridge can also cause drips or make the handle hard to turn.
Leaks at the Tub Spout
If water drips from the spout after the faucet is turned off, the valve is not closing all the way. If water sprays from behind the spout or around its base during a shower, the spout may be loose, cracked, or have a worn diverter, the part that sends water up to the showerhead.
Hidden Water Behind the Wall
The trim plates around handles and spouts are usually sealed with caulk. When that caulk cracks, shower spray can run behind the trim and into the wall. Over time, this can lead to:
- Loose or cracked tiles near the tub
- Soft or stained drywall on the other side of the wall
- Mold in the wall cavity
- Stains on the ceiling below the bathroom
Keeping Water Out of the Wall
Recaulk around trim plates and the spout when you see gaps. Watch for drips after the water is off. If the handle feels loose or the drip will not stop, the valve parts likely need replacing. Matching parts can be tricky with older faucets, and the water must be shut off before the valve is opened.
If you see stains or soft spots near the tub, stopping the leak inside the wall is worth doing soon. For bathroom faucet questions, you can call a plumber for advice at (833) 603-1840.