The average garden hose puts about 40 80 psi which is all that you need to properly and effectively clean your roof.
Roof cleaning mixture.
On a standard shingle roof here i can do a 2000 sq ft house with 50 gallons of mix easy.
Ignore your landscape and surrounding areas which can be harmed by the bleach solution.
And proper rinsing is without a doubt of utmost importance.
The secret to roof cleaning is the proper mixture of chemicals.
We clean roofs all day long.
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.
No matter what method used.
Soft wash roof cleaning how to wash your roof safely best roof wash method video link you can share of this video https youtu be owkh b0brt8 in this video.
So you would wet down all plants and then rinse them again once you re done cleaning the roof.
Pour the mixture into the garden sprayer.
Clean shingles on a cool humid overcast day to ensure that the cleaner doesn t dry too fast on the roof.
But once in a while it just gets way to hot.
Mix the hot water bleach and detergent in the bucket until the soap granules dissolve.
I won t reveal my mix ratio but it certainly does not have to be flooded.
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.
If it s something like scratch tile then it will take like 100 gallons for me.
Folks do not realize that one gallon of chlorine not bleach will kill bacteria in 10 000 gallons of water.