Home Inspector Says Your Tile Shower Is Probably Leaking and Proves It With a Swollen Baseboard in a House Only a Few Years Old

It looked like the kind of shower people put on a wish list: clean tile, nice niches, a glass door that hung just right. But home inspector @duesouthbrad walked into this bathroom in a house only a few years old and opened with a warning that should make every homeowner glance toward their own bathroom. “If you have a tile shower, it probably leaks,” he says.

At first glance, he admits, there is nothing alarming. “For all intents and purposes, it looks pretty good, right?” he says. “Good little clean tile job.” The door install looks fine. “Nothing too egregious.”

Then he starts pointing out small details that tell a bigger story. Someone had run silicone caulk around the base of the shower, up a vertical corner joint, and over a few other spots. To an inspector, that is a clue. “So we know that they had some cracked grout,” he explains.

And here is the heart of his message. In a properly built shower, patching grout should not matter much at all. “If you have a properly waterproof shower, you don’t need any of that, right?” he says. “Because the walls and the pan liner, they’re all gonna do their job. You don’t even need the tile.”

The Clues Hiding in the Bedroom Next Door

He then turns the camera to the trim outside the shower. The baseboard is visibly swollen. He anticipates the homeowner’s pushback: water drips when you open the door, so maybe it is no big deal. He jokes that someone could tell him not to make a mountain out of a molehill.

So he walks into the room on the other side of the shower wall. “This is the primary bedroom for crying out loud,” he says. There, he finds the floor starting to crown at the joints, meaning the edges of the boards are lifting from moisture. There is visible moisture damage. And the baseboard is swollen on that side too.

That detail is what settles it for him. Water from an open shower door does not travel through a wall into the next room. “The swollen baseboard, being on this side of the shower, that tells me more than anything else,” he says. His verdict: “That tells me that shower’s not waterproofed.”

@duesouthbrad

In his caption he sums up the lesson in plain terms: “Tile and grout aren’t waterproof. The waterproofing system underneath is what matters.” He adds that this is what he keeps finding during inspections, and that this house, despite its age, already had a significant shower leak.

Why Tile Alone Will Not Keep Water Out

Many people assume tile is a waterproof surface. It is not. Grout is porous, tile can crack, and water seeps through both over time. In a well-built shower, that does not matter, because behind the tile there is a waterproof layer doing the real work. That might be a traditional rubber or vinyl pan liner under a mortar bed, a liquid membrane painted onto the walls and floor, or a sheet membrane system.

When that layer is missing, installed poorly, or punctured, water that gets past the tile soaks into the wall framing, the subfloor and anything nearby. Because it happens slowly and out of sight, the damage can build for years before anyone notices. By then, the fix often means tearing out the shower, not just regrouting it.

How to Tell if Your Shower Might Be Leaking

You do not need special tools to look for the same warning signs the inspector found.

Check the trim and floors around the shower. Swollen, soft or peeling baseboards, cupped or lifted wood floors, and loose or cracked tile near the shower are red flags.

Look on the other side of the wall. Peek into the closet or bedroom that shares a wall with the shower. Bubbling paint, stains, a musty smell, or damp carpet are worth investigating.

Check the ceiling below. If the shower is upstairs, look for brown rings, sagging drywall or peeling paint on the ceiling underneath.

Notice the caulk. Lots of silicone smeared over grout lines, especially in fresh layers, can mean someone has been chasing cracks. That is not proof of a leak, but it is a reason to look closer.

Watch the grout. Grout that stays dark long after a shower, crumbles, or keeps cracking in the same spot may point to movement or moisture behind the tile.

What to Do if You Suspect a Problem

Act early. Water damage rarely gets cheaper with time. A plumber or a home inspector can use a moisture meter to check walls and floors without tearing anything out. Some can also run a flood test on the shower pan to see whether it holds water.

If you are buying a home, even a newer one, ask the inspector to pay special attention to showers and to check nearby rooms for moisture. If you are remodeling, ask your contractor exactly what waterproofing system they will use and whether it will be tested before tile goes up. Keep receipts and photos. A good installer will be glad to answer.

And if you are simply living with a tile shower you love, keep up with sealing and regrouting, but do not let a fresh bead of caulk fool you into thinking the job is done. As this inspector’s footage shows, the real story is often hiding on the other side of the wall.

Willow and Hearth