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.
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Need a little more scrubbing power? Want to increase your cleaning efficiency?
Ultimate Washer offers a variety of Rotary Nozzles from which you can choose. Your cleaning time can be cut in half with the addition of this nozzle. These nozzles rotate at high speeds to increase the intensity of the spray. They can remove rust, graffiti, and barnacles from the bottom of boats just to mention a few. They can be used on pressure washers with as little as 3000 PSI up to the super heavy duty pressure washers whose PSI reaches 5000 PSI. Find more info at http://www.ultimatewasher.com/pressure-washer-rotary-nozzles.htm