What Happens When a Shower Pan Leaks?

A shower pan leak often starts quietly. You may see small cracks in the grout or a slightly soft spot under the tiles. Water can travel along the pan's edge and soak into the wood framing below, even if the shower looks fine from above.

Other clues include a persistent musty odor, peeling paint on the ceiling below, or a dark stain that grows over time. If you notice any of these, turn off the water to that shower and avoid using it until the leak is checked.

• Cracked or loose tiles
• Water stains on the ceiling below
• A musty smell in the bathroom
• Squeaky or soft floor near the shower
• Visible rust or corrosion on the drain

Prolonged moisture can rot the wood under your shower and in the surrounding floor. This weakens the structure, making tiles crack or shift. In severe cases, the subfloor may sag, and the shower pan itself can settle unevenly.

Mold is another concern. It can grow on damp wood, drywall, and insulation, spreading spores into the air. If you or anyone in your home feels unwell from possible mold exposure, see a doctor. A mold professional can assess the situation if you find visible growth.

Fixing a shower pan leak often starts with removing the damaged pan and some surrounding tile. The pros inspect the subfloor and framing for rot, then replace any weakened wood. They may also treat the area to prevent mold before installing a new pan.

After the new pan is in place, the tile and waterproofing are rebuilt. The work typically includes drying the wall cavities and replacing any wet drywall. The total cost varies widely, depending on the size of your shower and the extent of the damage.