The window
EPA and CDC both say to dry wet areas within 24 to 48 hours. CDC goes further. If you could not, assume there is mold. That is not a scare line. It is a planning rule. Treat anything that stayed wet longer than that as suspect until it is checked.
What mold needs
- Water. A leak, a flood, or humidity over 60 percent.
- Food. Drywall paper, wood, carpet backing and dust.
- Time. Days, not weeks.
- Warmth. Las Vegas homes are rarely short on it.
EPA says to keep indoor humidity below 60 percent and ideally between 30 and 50. A hygrometer costs about $10 to $50 per EPA and tells you where you stand.
Desert homes are not immune
Dry outdoor air fools people. The inside of a wall cavity, a cabinet base under a sink, or the space behind a refrigerator can stay wet for a long time with no air moving through it. Add a slow AC drain overflow or a weeping supply line and you have every condition mold needs, out of sight.
Signs it is already growing
- A musty smell, the most common early sign.
- Spots or staining that spread.
- Paint that bubbles or peels.
- Allergy type symptoms like sneezing, runny nose, red eyes or rash in some people, per EPA.
If someone in the home has symptoms, talk to a health professional.
When it is a job for pros
| EPA job size | Area | Who |
|---|---|---|
| Small | Under 10 sq ft | Most people can clean it with an N95, gloves and goggles. |
| Medium | 10 to 100 sq ft | Limited containment with plastic sheeting. |
| Large | Over 100 sq ft | Full containment. |
Also call pros when mold may be in the HVAC, when the water was sewage, or when anyone in the home has asthma, allergies or a weak immune system.
Testing and claims to watch for
EPA says testing is usually unneeded when mold is visible, and there are no federal mold limits. Anyone who says a room passed EPA mold standards is selling something that does not exist. A good remediation finds the water, contains the area, removes what grew and dries it. The proof is that the moisture readings and the smell are gone.