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.
What you can expect from a low pressure clean and treat service is a roof to be moss free for a period of 2-5 years. the variance depends on shading, debris and effectiveness of treatment post cleaning. Some roofs will be moss free for up to 5 years before new spores begin to grow.