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What do molds need to grow?Mold requires moisture, oxygen and a food source to develop and multiply. Most molds absorb nutrients by attacking dead organic matter or in some cases by functioning as a parasite on living organisms. Outdoor airborne levels of mold are subject to many environmental conditions. With proper structural maintenance and good housekeeping, indoor airborne levels will typically be less than outdoor levels. Indoors, molds can grow on wallboard, wallpaper, ceiling tiles, carpeting, leather, dust/debris. The inside of air conditioning systems, etc. are often more than sufficient to support mold growth. When these materials become moist due to floods, structural water leaks, plumbing leaks, condensation or excess humidity the ever present fungi initiate their reproductive cycles and explosive colony growth can occur.
How long does it take mold to grow?To be more specific, we should ask, "How long does it take for a mold spore to germinate?" Then we should ask, "How long does it take growing mold to colonize?"
To grow, molds need a food source, a certain temperature and moisture. Where these conditions are present, molds can germinate and colonize. How fast growth occurs depends on the combination of conditions. Spores can germinate after only 12 hours in some conditions and some grow in 24 to 48 hours. Houses offer an ample food supply — drywall, wood, insulation, paper. When these materials become damp or wet, settled spores can become growing molds.
Molds may colonize in 1 to 12 days depending on the type of mold. Following are several types of molds and the number of days in which colonization may take place:
Mucor sp. colonizes between 1 and 2 days.
Rhizopus sp. colonizes between 1 and 2 days.
Aspergillus sp. colonizes between 2 and 3 days.
Penicillium sp. colonizes between 2 and 3 days.
Stachybotrys chartarum colonizes between 8 and 12 days.
Baz.