Those areas are exposed to the most water so damage tends to spread quickly.
Water getting behind wall tile and under floor tile shower.
Leaking drainpipes in a shower or a bathroom plug will let water underneath tile.
Shower base if there are any cracks in the grout or any way for water to flow off the higher portion of the wall behind the tiles or a lack of sealer on the grout the moisture that gets behind the tiles will increase.
Tiles and paint dripping or spraying water in the wall will soak the plasterboard or drywall.
Eventually the moisture will start wicking up the walls behind the tile and you ll see mold lines at the wall to floor transition on the curb and even in recessed niches if they re exposed to enough direct water.
They can often cause damp and mould within surfaces behind tiles and can even threaten the structural integrity of walls so it s important to tackle the issue at the first sign of a leak.
Tiles are not perfectly moisture tight even when everything is done right.
If it gives this may be the problem.
The first step to repair shower tile after a leak is to assess the damage to determine how much of the wall has gotten wet.
But more important that moisture gets past the surface and into the wall.
That is why water proof membranes below the tiles in the bottom of tiled showers that drain into the floor drain have been mandatory for a long time now see.
If the house was built from roughly 1965 90 the wall behind the tile is covered with drywall greenboard.
Loose and peeling tiles are.
Water getting behind tiles can also damage the tile adhesive which could cause tiles to come loose and possibly fall off the wall altogether.
Caulking this joint is critical to keeping water out of the shower wall and preventing future water damage.
Leaky tiles can occur anywhere where water is used whether it s a shower a wet room or a kitchen splashback.
The best way to tell if this is your problem is to push down on the floor around the drain.
So it is important to use high quality silicone caulk and to ensure a complete seal.
Dripping water would be a key to leaking drainage.
Once the sealer is dry seal the gap between the tile and the shower pan or floor with a continuous bead of 100 percent silicone caulk.
Leaks typically start along the bottom of the wall where the tile meets the top of the tub or shower pan.