Problems with a leaky bathtub are often traced to the overflow tube or overflow drain assembly.
Before You Begin
Locate the source of the leak.
Start by checking the tile for grouting and caulking issues.
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These will only produce water leaks when the bathtub or shower is in use.
These should be addressed before plumbing repairs can be assumed.
That means the water would be leaking even when the bathtub or shower is not in use.
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In that case, it’s not a problem with the overflow tube.
Remove any access hatch or panel you have to expose the tub’s plumbing connections.
Run water in the tub and look for any water leaking directly below it.
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Tighten or repair them as needed.
If running water in the tub causes no leaking, trigger the shower instead.
Cracked or missing caulk around these elements lets water behind the shower wall.
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If the shower test does not reveal leaks, then the overflow tube is the most likely culprit.
To check the overflow gasket, remove the overflow plate.
Do this by removing the screw or screws holding the plate in place and pulling off the plate.
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You may need to cut away caulking from around the overflow plate before it will come off.
Cut the caulk with a utility knife.
If it is heavily worn, cracked, or compressed, it’s time to replace it.
During the inspection, you may find that the overflow pipe assembly is loose or damaged.
If so, it is an easy fix to replace the entire overflow assembly with new parts.
Tip
Some overflow plates are attached to the stopper assembly for the tub drain.
In this case, carefully pull the assembly up and out of the drain opening.
Most assemblies have a long, thin rod connected to a cylindrical stopper at the bottom.
Overflow drains are also connected to the tub waste line, which further complicates the process.
Remove the Old Overflow Gasket
Replace a worn or damaged gasket by first removing the old gasket.
ensure it is fully seated against the flange so that it will make an even seal against the tub.
Secure the plate with its screw or screws.
