Water Damage Answer
To dry walls properly you have to remove the moisture inside the cavity, not just the surface. Professionals remove the baseboard, may drill weep holes or open a section of drywall, and push warm dry air into the cavity with air movers while an LGR dehumidifier pulls moisture out - verified with meters. Fans alone leave hidden moisture that grows mold.
The mistake most DIY drying makes is treating the surface. A wall can feel dry to the touch while the drywall core, insulation, and bottom plate stay saturated - and that trapped moisture is exactly where mold starts within 24 to 48 hours.
Whether a wall can be dried in place or must be opened depends on the water category and how long it sat. Clean water caught quickly can often be dried; Category 3 water or long-saturated drywall usually has to be removed.
Water damage in the Kansas City metro? Call (913) 213-3686 for a live 24/7 responder, or learn more about Kansas City water damage restoration.