The tiny roots of the moss dig into the roofing shingle surface and loosen the sand to lift it off the petroleum material under it. They also work up under the overlapping shingles, splitting them apart. Moss will also hold moisture against the shingles and flashing like a sponge, causing the bacteria growth to rage and decompose your roofing. Constant can remove that majority of moss by hand without wearing shingles needlessly and coat the roof with a spray that suffocates the roots of moss causing it to shrivel up and fall off over time without harming other vegetation on the property.
