Symptoms
- Water stain on the ceiling below near where the tub's overflow is located
- Dampness around the overflow plate screws
- Leak only happens when the tub is filled close to the overflow height
- No visible leak when the tub isn't in use
Likely causes
- CommonWorn or missing gasket behind the overflow plateThis rubber gasket seals the connection between the plate and the overflow pipe, and it degrades with age.
- CommonLoose overflow plate screwsIf the plate isn't snug against the tub wall, water can seep around the edges.
- PossibleCracked overflow pipe or fittingThe pipe behind the wall connecting the overflow to the drain can crack from age or a rough installation.
- Less commonTrip lever linkage displacing the gasket sealA poorly adjusted linkage assembly can push against the gasket unevenly, creating a gap.
What to do
- Remove the two screws holding the overflow plate and gently pull out the plate and linkage assembly together.
- Inspect the rubber gasket for cracking, flattening, or gaps; most overflow leaks trace back to this part.
- Clean the mounting surface on the tub wall of any old gasket material or grime.
- Install a new gasket sized to match, then reinsert the linkage assembly.
- Tighten the screws evenly, snug but not overtightened, to compress the gasket fully without cracking the plate.
- Fill the tub to just above the overflow level and check the area behind the wall (or below, if accessible) for leaking.
- If leaking continues after a new gasket, the overflow pipe itself likely needs inspection, which may require opening the wall.
Tools and parts
- Screwdriver
Tub overflow gasketSearch: “bathtub overflow gasket”
When to call a pro
Call a plumber if the leak continues after a new gasket, since the pipe behind the wall may need repair.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.