Under your shower pan is an adjoining drain body that connects.
Shower floor leaking around drain.
If none are visible fill the tub and look again for leaks.
A leaking shower is generally due to plumbers putty that has started to give away around the seals on the shower drain allowing water to seep through the cracks and onto the basement ceiling below.
If you don t have access to the underside of the drain plug the drain and add enough water to form a small puddle around the drain photo.
Scrub the shower strainer and the drain body clean.
Continue scrubbing until you remove as much soap scum and buildup as possible.
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A sure fire way of testing a shower floor to see if it leaks is to place a drain stop in the shower drain and fill the pan up with water to the level of where the wall starts.
In serious cases a shower pan may even develop cracks in its floor surface.
Look for the typical signs of leakage.
Why your shower pan is moving or flexing identifying the cause behind the moving shower pan is nearly as important as the fix itself.
Check the drains and traps for leaks from below through the access panel.
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Get an old toothbrush and scrub both the strainer and the drain body with warm soapy water.
Sometimes severe flexing can stress the drain fittings and may cause a leak around the shower drain.
Why is my shower leaking into downstairs.
These tests should identify the source of the problem.
In a shower plug the drain with a rag and then release the water.
If you suspect it s your shower drain that leaks try this test.
A visible water stain running across your ceiling just below a shower area indicates the potential that your shower drain is leaking.
How to fix a leaky shower drain.
Replacing the shower drain caulk is a great opportunity to give the strainer and the drain body a good clean.
Wait a day or two for any leaked water to dry.