How Long Does It Take For Black Mold To Form On Wood. From the moment that spores strike a solid habitat, moldy conditions might appear between 24 and 48 hours later. Once toxic black mold is growing though it usually forces out any other molds growing nearby and takes over its environment.
For instance, if you allow a carpet to remain wet after a flood, mold will inevitably begin to grow because the spores already exist in the environment. It can grow on material with a high cellulose content, such as fiberboard, gypsum board, and paper. How long it takes to grow 1 to 2 ft up a wall.depends on the room's temperature, moisture/humidity, type of material it's growing on (plaster, wood, cement etc) & if other types of mold spores were already on the wall & ceiling's surface.
It doesn’t take too long for mold to grow.
Mold can start to grow on the walls, or inside the wall cavities, of rooms that were flooded. Mold only needs two things to thrive, water and organic matter to feed on. Even worse, it will continue to grow until steps are taken to eliminate the source of moisture, and effectively deal with the mold problem. It takes one to two weeks for black mold to start growing under damp, wet conditions.