Ventilation Failure or a Hidden Leak We Find Which One
Bathrooms in Las Vegas homes produce mold for three reasons: inadequate ventilation that keeps humidity elevated after showers, slow leaks from supply lines or drains that run invisibly inside walls and under the floor, and shower pan or tub surround failures that allow water to migrate below the tile into the subfloor. The most visible bathroom mold discoloration on grout lines, black edges on caulk is surface growth. The more serious situation is what cannot be seen behind the tile.
Most Las Vegas homes were built with bathroom exhaust fans. A significant percentage of those fans either do not terminate outside (they vent into the attic), are inadequate for the room size, or have been broken long enough that nobody notices they stopped working. I find bathroom fan failures as a contributing factor in a large share of bathroom mold calls across the valley.
When the Problem Is Behind the Tile
Shower pan failures and slow drain connection leaks allow water to migrate below the tile surface into the mortar bed and the subfloor below it. The tile surface looks completely normal while a mold colony establishes behind it. The first sign is usually a soft spot underfoot where the subfloor has been degraded by long-term moisture, a smell that does not go away after ventilation, or grout that has separated slightly from the tile. We have found significant Aspergillus growth behind shower walls in Spring Valley and Paradise homes where the tile surface showed no visible discoloration whatsoever.
What We Do
We assess whether the mold is surface-only or has penetrated behind the tile and into the wall assembly. Thermal imaging and moisture metering tell us without demolition. If the scope requires tile removal, we assess the full extent and give you a written scope before work begins. Read more about our mold removal service and inspection process. Free for property owners. Call (702) 442-1126.