Common causes
| Where | Likely cause |
|---|---|
| Around the toilet base | Failed wax ring or loose toilet flange |
| Outside the shower | Cracked shower pan, failed curb or missing membrane |
| Near the tub | Failed caulk or overflow gasket |
| Under the vanity | Supply line or drain leak |
Why it matters
- Rotting subfloor and joists on pier-and-beam homes
- Mold growing in walls and under tile
- Termites, which are drawn to damp wood
- Damage spreading to rooms below on two-story homes
How it’s fixed
We remove the fixture and damaged flooring, replace rotted subfloor or framing, fix the plumbing, and rebuild the shower or floor with a continuous waterproofing membrane and a flood test before tile. Often the most cost-effective fix is to remodel the whole bathroom at once.
Common questions
Is a soft bathroom floor dangerous?
It can be. Rotted subfloor can give way under a toilet or bathtub. Have it checked soon and avoid heavy loads on the soft area.
Can I just re-caulk or re-grout?
Not if the floor is already soft. Caulk and grout aren’t waterproof barriers; the water is already under the surface.
Sources
This guide is general information, not legal, tax or financial advice. Rules change; confirm details with the agency named in the sources or a licensed professional.