Shower Problems
How to tell a shower pan has failed
Last updated
Short answer
A failed shower pan usually shows up as a floor that flexes underfoot, loose or hollow floor tile, staining on the ceiling or wall below, chalky deposits at the grout, or water that pools instead of draining. Once the pan is compromised, patching the surface does not stop the water.
Key takeaways
- Flex underfoot means the substrate under the tile is saturated or delaminated.
- A stain on the ceiling below a shower is a pan or drain issue until proven otherwise.
- Standing water means the slope is wrong, which is a build issue, not a maintenance one.
- Efflorescence at floor grout lines means water is passing through and evaporating out.
- The pan is rebuilt with the walls in most cases; they are one waterproofed assembly.
The five signs
- 1The floor gives slightly when you stand near the drain
- 2Floor tiles sound hollow or lift at a corner
- 3A ring, stain or bubbled paint on the ceiling of the room below
- 4White powdery residue on floor grout that returns after cleaning
- 5Water that sits in a low spot for minutes after the shower is off
Why pans fail
The common causes are a pan with too little slope to the drain, a liner or membrane that was never properly tied into the drain assembly, corners folded rather than detailed, and a shower built directly on drywall or unprotected board. In older Treasure Valley homes we also see mortar beds that were never pre-sloped under the liner, so water sat in the bed rather than draining out of the weep holes.
What a proper rebuild involves
Demolition to framing, subfloor repair where needed, a correctly pre-sloped pan, a bonded membrane detailed at every corner and tied to the drain flange, a flood test before tile, and then tile. That sequence is the whole reason a rebuilt shower lasts.
If water has reached framing or the ceiling below, the repair is about the structure first and the tile second. That is worth knowing before choosing tile.
Frequently asked questions
- Can a failed pan be repaired without removing the walls?
- Rarely. The pan membrane laps up the walls, so opening the floor almost always means opening the lower walls.
- Do you flood test?
- Yes. Testing the assembly before tile is the only way to know the waterproofing works while it is still cheap to fix.
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