Moss can hold moisture against roofing, but climbing onto a damp roof to pull it off creates a much greater fall hazard than the cleaning problem itself. The priority is ground-based or professional access and methods that do not damage the roof covering.
Do not walk on a wet or mossy roof
Moss and moisture greatly reduce traction, and shingles or tiles can break underfoot. If the area cannot be reached from a safe, stable position, removal should be handled by a professional using appropriate fall protection.
Avoid aggressive scraping on roofing materials
Hard brushes, metal tools, and high pressure can strip granules, break edges, or shift roofing pieces. The method should match the roofing material and the manufacturer’s care instructions.
Protect gutters, plants, and runoff areas
Anything applied to a roof eventually reaches gutters and downspouts. Read the product label, protect sensitive vegetation, and avoid concentrated homemade mixtures that may damage metal, finishes, or the surrounding environment.
Reduce shade and moisture only where it is safe
Overhanging branches, trapped leaves, and poor drainage keep roofing damp. Trimming branches that are safely reachable from the ground and keeping gutters clear can help; high work or work near power lines belongs to professionals.