Organic growth like lichen and moss is a natural phenomenon that occurs on most permanent outdoor structures including your roof. Its appearance and extent is dependent on local conditions and can even vary on different parts of the same roof. Temperature and humidity, the pitch and orientation of the roof and the location of nearby trees are all possible contributing factors.

Left unchecked, organic growth can cause damage to the surface coating of your roof and can create ‘moisture traps’ that cause corrosion.