The sequence of events

Illustrative example. Not a real job or customer.

A few years after an older primary bath is updated with a steam unit, the owners notice clothing in the walk-in closet smells musty and the paint on the shared wall has small bubbles near the ceiling.

  1. A handyman regrouts and reseals the shower tile, assuming worn grout is the problem.
  2. The closet smell fades for a few weeks, then returns once steam use resumes.
  3. A remediation contractor takes moisture readings on the closet side of the shared wall and finds high readings concentrated in the upper part of the wall and along the ceiling.
  4. A few tiles are carefully removed for inspection, revealing that the membrane behind the tile stops short of the ceiling.
  5. The closet side is contained, contaminated drywall and insulation are removed, and framing is cleaned and dried.
  6. A tile contractor rebuilds the enclosure with a continuous vapor barrier covering walls and ceiling.

The closet is rebuilt, the shower is retiled, and the steam unit's enclosure now meets the manufacturer's design requirements. Clothing and shoes from the closet are laundered or professionally cleaned.

First attempt versus second

Regrout and reseal

  • Addressed only the surface
  • No moisture readings taken
  • Smell returned with continued use
  • Growth continued in the wall

Investigate, remediate, rebuild

  • Readings located the wet area
  • Inspection opening showed the missing membrane
  • Contaminated materials removed under containment
  • Enclosure rebuilt with continuous vapor control

Questions this owner wished they had asked earlier

  1. When the steam unit was added, was the existing shower assembly rebuilt or reused?
  2. Does the vapor barrier cover the ceiling of the enclosure?
  3. Can you take moisture readings from the closet side before deciding on a fix?
  4. Does the steam generator's manual specify enclosure requirements?

Takeaways

Clue that was easy to miss
Bubbling paint high on a closet wall
Why regrouting failed
The problem was behind the tile, not in the grout
What found it
Moisture readings on the far side of the wall
Note
This example is hypothetical and does not describe a real home or job

Common questions

Were the clothes in the closet ruined?
Washable garments usually come clean with normal laundering once they are taken out of the damp space. Leather, suede, wool coats and shoes may need a dry cleaner or specialist. Items with heavy visible growth that cannot be cleaned are typically discarded.
Could the owners have kept using the steam shower during the investigation?
It would have kept feeding moisture into the wall. Pausing steam use while the source is found and the wall is opened prevents the problem from growing and makes moisture readings easier to interpret.

General information for Cherry Hills Village, not a quote or professional advice. In an emergency, call 911.