The window
Why 24–48 hours matters
Mold spores are already present in most homes. Give them moisture and a food source, like the paper on drywall, wood or carpet backing, and they start growing. Drying within a day or two takes away the moisture before growth gets going.
Richardson’s warm, humid months speed things up, and so do enclosed spaces like wall cavities, closets and under cabinets.
Where it hides
Where mold starts after a leak
- Behind baseboards and the lower part of drywall
- Under carpet pad and floating floors
- Inside wall cavities and insulation
- Under sinks and behind dishwashers and fridges
- In attics below AC drain pans
Who handles it
When to clean it yourself and when not to
| Situation | Usually |
|---|---|
| Small area, under about 10 sq ft, from clean water | Homeowner can clean it with gloves, goggles and an N-95 (EPA) |
| 25 contiguous sq ft or more of visible mold | TDLR-licensed assessor and remediator in Texas, with limited exemptions |
| Mold from sewage or floodwater | Professional cleanup |
More on Texas rules and prevention: mold prevention after water damage.
FAQ
Mold timing FAQs
How fast does mold grow after a leak?
The EPA says water-damaged areas should be dried within 24 to 48 hours to prevent mold growth. After that, mold can begin growing on wet drywall, wood, carpet and other materials.
Will mold grow if the wall looks dry?
It can. Drywall can feel dry on the surface while the back side, insulation and framing stay wet. Moisture readings, not touch, tell you when a wall is really dry.
When do I need a licensed mold company in Texas?
The Texas Department of Licensing and Regulation generally requires licensed mold assessment and remediation for 25 contiguous square feet or more of visible mold, with limited exemptions. The EPA says areas under about 10 square feet can usually be cleaned by the homeowner with proper protection.
Sources for this page
Last updated October 2026.
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