Is there mold in my house?

Hidden mold may sit on the back of drywall, wallpaper or paneling, the top of ceiling tiles, and the underside of carpets and pads. Telltale signs are a musty odor, bubbling or soft spots in the wall, stains that keep coming back, and a moisture meter reading that stays high after the surface looks dry. In Florida, hot humid outdoor air pulled into a wall cavity can condense on air-conditioned gypsum board and feed hidden growth. A moisture inspection is the practical first step.

Bathrooms and closets stay damp and get little airflow. Common indoor mold sites include bathroom tile and grout, areas around windows, and near leaky fixtures. Closets are often missed because they may get no conditioned air, and mold on leather and fabric is not uncommon there. The fix is ventilation and drying: run the exhaust fan or open a window when showering, keep the fan on long enough to clear steam, and do not block closet walls with dense storage against a cold exterior wall.

Dry fast and decide what can be saved. If a home flooded and could not be dried within 24 to 48 hours, assume mold growth. Remove standing water, extract carpet and backing, and use dehumidification and fans to dry within 24 to 48 hours. Throw away anything wet that cannot be cleaned and dried completely in that window, especially porous materials. If the water was sewage or otherwise contaminated, call a professional experienced in contaminated-water remediation.

Yes. Mold grows on materials that stay wet for 48 to 72 hours, and wood, fiberboard and paper are all food sources for it. Hard, non-porous items can often be cleaned and dried, but porous items such as carpet, ceiling tiles and cellulose insulation may have to be thrown away because growth gets into crevices. If a piece of solid wood is still structurally sound, cleaning and drying may work; if it is soft, crumbling or delaminating, replacement is usually the answer.

Miami's outdoor air is humid for most of the year. NOAA's 1991-2020 normals show Miami averaging a 67.0 F annual dew point, with every hourly normal dew point from June through September at or above 70 F. Monthly precipitation normals run roughly 1.8-3.5 inches in the dry season and 6.3-10.5 inches from May through October, and cooling degree days at a 65 F base peak near 590-595 per month in July and August. Those normals describe outdoor conditions; indoor moisture still depends on leaks, ventilation and air conditioning.