What is Moss Treatment?

Definition

The application of biocidal products — typically zinc sulfate, copper sulfate, or proprietary surfactant-based cleaners — to kill existing moss growth on roof surfaces. Treatment is followed by gentle brushing or washing after the moss dies (typically 2-4 weeks). Preventive zinc or copper strips installed at the ridge leach trace metals in rainwater down the roof to inhibit future growth. Pressure washing is not recommended as it forces water under shingles and strips granules.