When you pressure wash use the minimum force possible to pry the fungus free and wash it from the roof.
How to pressure wash a steep roof.
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Here s a video link to the instances that call for rinsing.
Water pressure under 2000 psi should be sufficient for a quick and efficient job.
Keep the spray at a 45 degree angle with the surface to avoid gouging and move the nozzle in even strokes at a distance of 8 to 10 inches from the roofing material.
Aim the pressure washer down the roof toward the gutters and keep the tip of the wand at least a foot away from the surface when starting.
1 attach a 35 degree spray wand to the pressure washer hose and fill the pressure washer.
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Always stand on a dry area of the roof as wet shingles can be very slippery.
Never aim your pressure washer up the roof as it can push water under the shingles.