Here’s the problem with mold:
The spores are everywhere. They just float around in the air, waiting for time and the opportunity to land on something edible like cellulose. Some areas there aren’t as many spores (like, say, in the arctic) and in some areas like humidity-prone Louisiana, they abound year round. Architects must build accordingly, and residents must live wisely to keep ahead of a potential problem.
So the trick is to learn when and where you are most vulnerable, depending on where you live, and build appropriately, ventilate appropriately and filter appropriately. It will differ depending on where you live. Different locales will have to deal with different problems, such as continuous or occasional humidity, fluctuations in weather, etc… And of course, all internal dwellings will have to deal with whatever happens in closed systems like bathrooms, which have huge possibilities for developing internal humidity, the kind of area which is perfect for a rogue mold spore to establish a mold colony.
If you’re in California, you might want to give us a call and see about getting an assessment from Byebyemold.