Is Your Shower Leaking? 7 Signs It's Time for a Shower Pan Replacement
A tiled shower looks waterproof, but tile and grout aren't. The real protection is underneath: a shower pan (the sloped, waterproofed base) and the membrane behind the walls. When that layer fails, water goes where you can't see it, usually for months before anyone notices.
This is especially common in older homes across the Bay Area and the Sacramento region, where many showers are 30, 40 or even 60 years old.
7 signs your shower pan may be failing
Stains or bubbling paint on the ceiling below an upstairs shower, or on the wall on the other side of the shower.
Loose, hollow-sounding or cracked tile on the shower floor or the bottom rows of the walls.
Grout that keeps cracking or turning dark even after cleaning or regrouting.
A musty smell that comes back no matter how much you clean.
Water at the base of the shower after use, or damp baseboards and flooring outside the shower.
Soft or spongy floor near the shower entry.
Mold or mildew along the bottom of the walls or curb that returns quickly.
One sign on its own isn't proof. Two or three together are worth having someone look at before the damage spreads to the subfloor or framing.
Why shower pans fail
Age. Older pans often used liners that eventually crack, or were built without enough slope, so water sits instead of draining.
Grout and caulk wear. Once grout and caulk break down, more water reaches the layers below than they were designed for.
Drain problems. A loose or corroded drain connection lets water bypass the pan entirely.
Shortcuts during installation. Missing waterproofing at corners, the curb or the niche is a common culprit.
Can't I just regrout?
Sometimes, yes. If the problem is only cracked grout and the tile is solid, a careful regrout and recaulk can buy years. But if water has already gotten under the tile, new grout just hides the problem. A quick inspection will tell you which situation you're in.
What a proper shower pan replacement involves
Removing the floor tile and the lowest rows of wall tile, so the new waterproofing can overlap the walls correctly.
Checking the subfloor, framing and drain for rot or damage, and repairing them before building anything new.
Building a new sloped base that drains to the right spot.
Waterproofing the pan, curb and lower walls as one continuous system, and flood-testing it before tile goes down.
Setting new floor tile, plus matching or complementary tile for the wall rows that were removed.
In the Bay Area, a tiled shower pan replacement typically runs about $2,500 – $5,500, depending on the size, the condition of what's underneath, and the tile. (See our full Bay Area tile cost guide.)
When it makes sense to redo the whole shower
If the wall tile is dated, several walls show damage, or you've been wanting a walk-in shower anyway, replacing the pan alone can mean paying twice. In those cases a full rebuild, with new waterproofing from floor to ceiling, is often the better investment.
Not sure what you're dealing with?
Send Mike a few photos of your shower: the floor, the bottom of the walls and any stains you've noticed. He'll tell you honestly whether it looks like a grout fix, a pan replacement or something bigger.
Call or text 916-847-2825, or request a free estimate on our website. We serve Folsom, the Sacramento region and the San Francisco Bay Area.
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