Spraying water under your shingles can both tear off the shingles and force water under them and into your home.
How to pressure wash a steep roof.
Always stand on a dry area of the roof as wet shingles can be very slippery.
Begin from a corner of the roof and work your way down from top to bottom.
1 attach a 35 degree spray wand to the pressure washer hose and fill the pressure washer.
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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.
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.
Water pressure under 2000 psi should be sufficient for a quick and efficient job.
Here s a video link to the instances that call for rinsing.
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.