Moss thrives in moist, shaded areas. Keeping your roof and gutters clear of debris will help to keep your roof dry so moss spores cannot take root. Trimming back overhanging trees and shrubs will help prevent moss spores from accumulating in those areas and will allow more sunlight to reach the roof which will help keep the roof dry. Whether or not you have issues with debris or overhanging limbs on your roof, we still recommend applying some type of moss treatment to your roof regularly. These are the best methods for keeping moss at bay.