How Long Does It Take For Black Mold To Grow On Drywall. It may be a week or two before it grows to the extent that it is visible to the naked eye as spots on drywall or carpet pads. It takes one to two weeks for black mold to start growing under damp, wet conditions.
How long does it take for mold to grow on drywall? Preventing mold on bathroom drywall. Under ideal conditions (optimal temperature and level of humidity), it takes 24 to 48 hours for mold to germinate and grow.
From the moment that spores strike a solid habitat, moldy conditions might appear between 24 and 48 hours later.
Toxic black mold needs a suitable material to be very wet for at least a week before it can begin to grow. In the case of flood damage from rain or a burst pipe, mold can grow in as little as 24 to 48 hours and in some cases even take a few days to manifest. The first reason you want to remove drywall that has started to grow black spots on it is because it’s unsightly. In many ways, black mold acts in the same manner as other microbes.