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Power washing your roof will extend its life, and prevent any health hazards from the accumulation of fungus or mildew. Additionally, a moss and fungus covered roof will absorb more heat and therefore increase your utility bills.
The recommended frequency to clean your roof depends on the location of your home. In the northern states roofs can go longer between cleanings but wherever they are exposed to high temperatures and humidity year round, they need to be cleaned at least every three to four years.
Whichever the case, avoid using your power washer if temperatures are near freezing as you may risk damage when the drained water freezes.
|Jennifer Mathes, Ph.D.|