The safest way to prevent moss growth. We guarantee 5 years no moss. We gently remove large moss 1” tall or larger. We then clean all loose debris from the roof, interior gutters and downspouts. All gutter clogs will be cleared. We apply MossBlock Roof Armor to the roof to kill moss spores and prevent future moss growth. We clean moss and debris that has fallen to ground. The Roof Armor is guaranteed no moss for 5 years. If there is light moss under 1” tall it will die and fall off in 6-12 months. If there is still light moss after 12 months Seattle Shine will reapply MossBlock Roof Armor Free for up to 5 years.