3000 psi is overkill and an unacceptable cleaning method for your roofing system whether it is an asphalt roof tile roof cedar roof or even a metal roof.
Roof cleaning mixture.
One is the guy on the roof spraying cleaning the roof and the other ones job is to spray everything and anything that could get over sprayed with the roof cleaner.
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After spraying the roof with the mixture allow it to sit on the surface for 15 to 20 minutes before rinsing thoroughly with clean water.
Pour the mixture into the garden sprayer.
Barrel tiles tend to take more mix also because everything rolls off the tops of the tiles and channels itself in the valleys of the tiles.
The secret to roof cleaning is the proper mixture of chemicals.
I won t reveal my mix ratio but it certainly does not have to be flooded.
On a standard shingle roof here i can do a 2000 sq ft house with 50 gallons of mix easy.
But once in a while it just gets way to hot.
Folks do not realize that one gallon of chlorine not bleach will kill bacteria in 10 000 gallons of water.
Mix the hot water bleach and detergent in the bucket until the soap granules dissolve.
Ignore your landscape and surrounding areas which can be harmed by the bleach solution.
The average garden hose puts about 40 80 psi which is all that you need to properly and effectively clean your roof.
We clean roofs all day long.
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No matter what method used.
If it s something like scratch tile then it will take like 100 gallons for me.