Moss blanketing a roof can make your house look like it came straight out of a fairy tale, but this serene scene can cause issues to the outside of your home.
Moss is known for readily blanketing across roofs in wet climates. This blanket of moss can be several inches thick. Spores collect in the space between shingles and moisture becomes trapped in the moss like a sponge which causes mold and decay. Decay to the roofs support structure can occur in severe cases.
Maintain your roof's health by keeping up with cleaning the roof from moss or any other organic growth. By adding zinc or copper flashing to your roof the rundown of metal can help dissolve moss growth. Zinc strips and chemical treatments will also help deter moss growth on your roof. Clear out any overhanging branches that may prevent sunlight from reaching your roof; moss thrives in damp, shady places.
If your roof presently has a thick layer of moss, make sure to take care when removing the growth. While it is imperative to remove moss from your roof to prevent moisture damage, it is possible to damage your roof further in the process.
Power washing your roof is not recommended as this can cause damage to the shingles, especially asphalt shingles.
Heavy moss can be physically removed by using a long handled scrubbing brush from the top of the roof to the bottom with care to not lift or damage the shingles. You may also use a diluted bleach mixture or one of several available chemical treatments to kill of any moss growth. Please be aware that these treatments will create runoff into any gardens or groundwater sources beneath it.
Peninsula Housing Services
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