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How to Pressure Wash Your Roof Video

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Roof cleaning may sound crazy, but cleaning roof shingles is a task many homeowners must do. Check the video for the moss, lichen and algae on Tim’s own roof. You can use a pressure washer to safely clean your asphalt shingles.

A pressure washer can damage roof shingles. You must use the correct spray wand tip when cleaning your roof. The 25 degree spray nozzle is generally the best choice. It will provide a fantastic stream of water to dislodge the moss and algae without damaging the shingles.

Try to stand on a dry portion of the roof when you work. Wet shingles can be really slippery. Always aim the pressure washer down the roof. Never aim it up the roof, as it can blast water under your shingles and cause leaks in your home.

Keep the tip of the pressure washer wand at least 12" away from the shingle surface when you begin cleaning. Clean off one shingle and check to see if the pressure washer is stripping away any of the colored granules off the shingles. Adjust the distance between the spray nozzle tip and the roof shingles to get maximum cleaning without damaging the shingles. Constantly stop and inspect the shingles to ensure no damage.

If done properly, you can remove years of algae growth, moss and lichen off your roof. And with no damage to the roof or to yourself. Just take your time.

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3 Responses to How to Pressure Wash Your Roof Video

  1. Tim, two safety thoughts caused by personal experience come to mind. 1: pre-test the spray pattern before using and check both hose and nozzle periodically. Years ago, using a pressure washer, I stripped moss, dirt and loose paint from the side of my house. Everything went smoothly until I was distracted. My spray pattern changed without my discovey leaving me where a stream (rather than fan spray) and some nasty scars in the wood. 2. Water under pressure cuts like a knife, especially flesh. A pressure washer is not a squirt gun or airless paint sprayer. A pressure sprayer should be given the same respect as an electric saw or welding torch.

  2. Hi Tim - appreciate this info - do not have a need here but was wondering why the same tip would be useful pressure washing a deck. I have your info in deck cleaning and am going to use your oxygen cleaning product as well as the guide you have prepared about the different types of stains as well - excellent material - but would this type of tip work on decks - I realize that some may not use the correct sprayer tip and so perhaps better to suggest not using pressure washers at all - but some of us do use your info and pay attention to your details - thanks Tim - Doug

  3. When pressurewashing a roof that is not level, is it true that you should never have the pressurewasher on the roof with you since it's not likely to be secure?

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