Adequate maintenance is essential to a roof’s overall performance and appearance. Besides repairs, roofs require cleaning to eliminate biological stains such as algae, moss and lichens. While virtually all roofs are prone to biological staining, roofs exposed to excessive rainfall, humidity and dense vegetation are particularly susceptible. Unlike algae and lichens, which are only unsightly, moss actually deteriorates shingles and causes roof damage. Spraying affected roofs with a bleach solution kills algae, moss and lichens to preserve the roof’s appearance and structural integrity. Mix a bleach solution for spraying the roof using basic techniques.

How to Spray Bleach on the Roof Without Climbing

Very dirty roofs require a second cleaning. Related Searches. References. Ask the Builder: Removing Moss and Algae from Roofs; . Different formulations are effective for different situations. Always use a stronger.