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.
Pour it full strength over the moss. Let it work for five to 10 minutes, then scrub, rinse and let dry. If any green remains, reapply vinegar and don't rinse it off. If there's still a problem, scrub the steps with a mixture of 3/4 cup household chlorine bleach and a gallon of water. Let stand for 10 minutes, then rinse.