Algae, moss and fungus can grow on the roof shingles on homes located in damp, cool weather conditions or in shaded spots. More sunshine exposure will decrease growth. Here in the Pacific Northwest we have these conditions that make moss thrive.
Moss on your roof is not only a cosmetic issue but can cause problems resulting in a reduced life for the roof. Stains and excess water can lead to faster wear. Cracking, damage, holes, and other structural damage can result.
For new homes we can protect the roof from moss and algae before it becomes a problem. For existing homes we can remove the moss and then prevent it from coming back.