Moss on a roof does not always mean it needs aggressive cleaning. We explain when roof moss should be physically removed, when biocide treatment may be enough, and when it may be better simply to monitor it.

Thinking about painting the exterior of your home? Cleaning and treating the roof and walls first can reveal the true condition of the existing finish. In some cases, you may find that repainting can be postponed, or may not yet be necessary.

Biocide treatment is widely used to control algae, moss, lichen and other organic growth on roofs and exterior surfaces. We explain how it works, why results can continue to develop after treatment, and where it fits into professional exterior cleaning.