Mold can be the byproduct of elevated Humidity in your attic and home. This can sometimes be caused by improperly installed insulation.
In the video above, Attic Buddies Insulation explains one possible scenario that you might be experiencing in your home.
They present possible solutions and encourage you to call for a free professional inspection, and encourage you to call a mold inspector and mitigation company if your home is already infected.
Take a look and call Attic Buddies if you feel you might have elevated humidity levels in your home or attic.