Bathrooms in Memphis don’t dry out the way they do in drier regions because the surrounding air is already loaded with moisture. After a shower, steam has nowhere to go, so it settles into grout lines, paint film, and ceiling corners where temperatures stay slightly cooler. Loess soil below the home adds to the problem by holding ground moisture that seeps upward, keeping crawlspaces and wall cavities damp longer. We see mold form fastest in bathrooms with underpowered fans, long duct runs, or fans that vent into attics instead of outside. Prevention here is about shortening moisture hang-time — moving damp air out fast enough that mold never gets the chance to anchor.