Shower Leak and Tile Repair in Wilmington, DE

Grout is porous and rigid, and it sits in joints that move a little every time the house warms, cools, or settles. Once a grout line cracks or wears thin, water sheets into the joint instead of running to the drain. Caulk at the inside corners and along the joint where the wall meets the pan or tub does a different job: it flexes where grout would crack, and when it peels away, that seam opens. A tile that sounds hollow when you tap it has lost its bond to whatever is behind it, which is a warning about the layer underneath.

Under the floor tile sits the pan, the waterproof layer that catches everything that soaks down through the grout and directs it into the drain. When a pan cracks, or its liner tears, or the seal where it meets the drain body fails, water runs off the edge of the pan and into the subfloor. This is the leak that stains the ceiling below, and the floor tile above it can still look fine.

Some shower leaks have nothing to do with tile. A valve body, a supply connection, or the threaded shower arm behind the head can drip inside the wall every time the water runs, wetting the framing and the backer board from behind. Repaired connections are soldered or press-fitted, with no push-to-connect fittings.

Jimmy water-tests the shower to find where it leaks before he prices the repair. A water test wets one part of the shower at a time, such as the walls, the floor, or the valve, while Jimmy watches where water turns up, so one failed layer can be told apart from the others.

A repair is the answer when the failure is local: a few cracked tiles, a run of bad grout, a peeled caulk joint, a single connection in the wall. When the pan has failed, or the backer has gone soft across a whole wall, patching the tile above it only moves the leak, and the job becomes a rebuild down to the framing with new waterproofing and new tile.

A tiled shower is built in one of three ways. A mortar bed has a pan liner on the subfloor (lead or copper in the oldest showers, a vinyl or CPE sheet in most), a thick layer of mortar packed over it and sloped to the drain, with wall tile set in mortar. It is heavy and rigid, and its pan is buried under the bed, so a leak from the pan cannot be reached without breaking up the floor. Cement backer board came next. The board itself passes water, so it relies on a plastic sheet behind it and a liner under the floor, and its weak points are where those layers overlap. In a shower built with a bonded membrane like Kerdi, the waterproofing sits right under the thin-set, and a leak points to a seam, a corner, or a pipe where the membrane was cut. Which of the three is behind your tile tells Jimmy where to look first and how much has to come out to reach it.