What is the best way to remove moss from a roof?
A. The best way to remove moss from a roof is to apply powdered zinc sulphate mixed with water to the recommended strength and to apply directly to the moss and surrounding area. The zinc sulphate is usually available from leading drug stores. This mixture can simply be applied with a low pressure applicator similar to those used to spray fruit trees and the like. It is best to apply on the moss when it is damp and thriving as in the spring or fall. Spray the formula to the moss to the point of saturation. As the zinc solution could be toxic to fish and plants you should take care not to spray to the point of run-off. Hose down adjacent vegetation with freshwater if there has been overspray. This should cause the moss to die in a few hot months and then you can direct a light stream of water at the dead moss and it should simply wash off.
