You may have read somewhere on the internet that it's perfectly okay to clean asphalt shingles with a high pressure washer but this is just plain wrong. I can virtually guarantee that if you climb up on your roof with a power washing wand and blast away at your shingles from close range that you will dislodge countless shingle granules in the process. Yes, you might also remove the algae stains, but if you cut five years off the life of your roof in the process then what's the point? Not only can it cause real damage to your shingles, but it can lead to water penetration in places that water isn't supposed to be. I'm talking about high pressure water intrusion around skylights, chimneys, and flashing. In other words, high pressure roof cleaning can turn into an absolute nightmare.
This is why you need to clean the roof first with a safe cleaner that will kill the roots of algea or moss and allow it to be rinsed off later
Get more information and products at http://www.wash-safe-canada.com/


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