Maybe a plumbing leak or maybe the drain is restricted in the shower and water is not allowed to fully drain away.
Water leaking through tile grout.
Cracks can develop in the grout between the tiles allowing moisture to seep through.
This tile needs periodic maintenance.
The shower water leak should be repaired quickly otherwise the buildup of stagnant water will lead to mold and damp under the tiles.
Leaking drainpipes in a shower or a bathroom plug will let water underneath tile.
If it is leaking then it isn t fully waterproof.
Leaky tiles can be found anywhere where there is water.
Check the ceramic tile walls surrounding your tub or shower.
They may have waterproofed the underlying deck but they could have made mistakes.
If water is oozing up through the grout joints and it is becoming moldy then water is not able to drain away.
What are the causes of water under a tile floor.
There should be proper flashing the membrane should be sloped to a drain that has weep holes to allow the water through.
The grout joints are porous so water can go through the grout and under the tile.
The best way to tell if.
Can shower water leak through grout.