Why Your Shower Leaks Again After a Remodel

A shower that leaks after a remodel almost always comes down to one missing step. It's not the tile. It's what went on before the tile.

Tile is not waterproof

Tile and grout shed most water, but not all of it. Water gets through grout lines over time, and grout is not a seal. The layer that actually stops water is the waterproof membrane behind the tile. When people say a shower is waterproof, they mean that hidden layer, not the part you can see.

The step crews skip

A waterproof membrane takes an extra day and costs a little, so a rushed crew tiles right over the backer board and calls it done. It looks finished the day they leave. It leaks within a year, usually into the wall or the floor below, and by then the tile is up and the fix is expensive. The step that gets skipped is the one that matters most.

Where the water actually goes

A shower leak rarely shows up in the shower. Water finds the framing, runs down a stud, and shows up as a stain on the ceiling below or a soft spot in the hallway floor. By the time you see it, the wet has been sitting in the wall for months, and wet framing in our climate means rot and mold. The small skipped step turns into a framing repair.

The pan and the curb leak too

Tile gets the blame, but the shower pan and the curb leak just as often. The pan under the floor tile has to be sloped and sealed to the drain, and the curb you step over has to be wrapped, not just tiled. Every niche, every valve, every place a pipe passes through the wall is a hole that has to be sealed. Those penetrations are where a lot of remodels go wrong.

How to know it was done right

Ask to see the waterproofing before any tile goes on. A crew that does it right will show you the membrane, the sealed corners, and the flood test on the pan. A flood test is simple: plug the drain, fill the pan, and watch it hold overnight. We set that layer first, test it, and let you watch it go in before a single tile is cut.

Common questions

How long before a badly built shower starts leaking?Usually inside the first year, often the first winter. Grout holds for a while, then water works through it and finds the framing. The leak is slow and hidden, so most people notice the ceiling stain or the smell long before they connect it to the shower.

Can you fix a leaking shower without tearing out all the tile?Rarely. If the membrane behind the tile was skipped, the fix is to take the tile off, put the waterproofing in, and re-tile. Patching grout or caulk buys a few weeks and hides the problem. We would rather do it once than sell you a patch that leaks again.

What does proper shower waterproofing actually involve?A waterproof membrane on the walls, a sloped and sealed pan under the floor, a wrapped curb, and every pipe and niche sealed where it passes through. Then a flood test on the pan before tile. Done that way, the shower stays dry no matter what the grout does.

Remodeling the bath anyway?

We set the membrane before the tile on every job, and we'll schedule that step so you can stand there and watch it go on before it disappears behind the wall. The quote lists it by name, so you never have to wonder whether it was skipped.

Start the bath remodel →