Elastomeric roof coatings are applied thicker than paint. These elastomeric roof coatings are used for roof leaks repair. An elastomeric roof coating seal roof leaks, saves and extends the life of old roofs. Elastomeric roof coatings are an excellent choice for roof leaks repair.
How to Clean Algae and Moss from a Roof. Apply the bleach solution with a garden sprayer. Let it stand on the surface for about 20 minutes, then rinse it off with spray from a garden hose. Don't let the bleach solution stand on the roof for more than 30 minutes or so without rinsing.
Cause, Cure, Prevention of Black or Green Algae Stains on Asphalt Shingles. 1  ALGAE STAINS on ROOFS - CONTENTS: How to identify & prevent black algae growth & stains on roof surfaces. How to identify & prevent green algae growth & stains on roofs. Algae stains and black marks on asphalt roof shingles: causes, effects on roof life, cure & prevention.