having been a Contractor for over 25 years, i have done my share of " Mold Remediation" ie: Cleaning the fungus. excessive moisture being the cause.Mold of any sort needs 3 things to grow - dark-warmth-wet. now we cannot always eliminate the dark part but we can do something about the other 2. First the biggest contributing factor WET, proper drainage is the biggest factor- good gutters aren't enough ,you need to be able to get the water away from the house ,using 4" drainage pipes to complement the gutters, keep all foliage off the house and trim trees blocking air movment to exterior. Ventalation, most houses are built to tight,thay need to breath, good soffit -ridge or gable ventalation is important. At least once a year have the roof inspected,small leaks lead to big problems,if ANY visable signs of water are found spray the area with bleach, A nd if water does enter the house in volume,fight with the insurance company if need be for a complete replacment of sheetrock and insulation in the effected area, or it will come back to haunt you.Now, this is just a very basic understanding of what we recommend, but there is a wealth of info on the web about Mold and how to prevent it. But keep in mind that some types can kill you: Black Mold, and will cause severe health problems. Good Luck to all this windy season..