A slow leak behind a shower wall usually shows up somewhere else entirely, and by the time it does, the damage has been happening for a while.
A shower with a failed waterproofing layer does not usually announce itself with visible water in the shower. The tile and grout are doing their normal job of getting wet and drying out. The problem is what's happening on the other side of the wall, out of view.
By the time a shower assembly shows an obvious problem inside the stall — bulging tile, a visibly soft spot — the waterproofing has usually already been compromised for a long time. The earlier signs are almost always elsewhere.
A shower on an upper floor with a ceiling stain in the room below, or a shower against a shared wall with discoloration or a musty smell appearing on the other side, is a strong signal that water is getting past the tile and finding a path outward.
Flooring that has gone soft, discolored, or slightly springy near the base of a shower or tub — especially just outside it — often means water has been tracking down inside the wall cavity to the floor level for some time.
Grout that stains or crumbles unusually fast, or caulk at the base that keeps failing no matter how often it's redone, can be a symptom of moisture working from behind rather than simple age.
A mildew smell that is strongest right after showering and fades later in the day, without an obvious visible source, is worth taking seriously rather than just running a fan longer.
None of these signs prove a leak on their own, but more than one together is worth a look before it gets worse. Where it turns out to be real, the honest fix is usually a full tear-out back to the studs and a rebuilt waterproofing assembly — not a surface patch over a problem that is still there.
Describe the job and we'll match you with an installer who builds the assembly in the right order.
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