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.
How to pressure wash a steep roof.
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.
Water pressure under 2000 psi should be sufficient for a quick and efficient job.
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When you pressure wash use the minimum force possible to pry the fungus free and wash it from the roof.
Spraying water under your shingles can both tear off the shingles and force water under them and into your home.
Begin from a corner of the roof and work your way down from top to bottom.
Never aim your pressure washer up the roof as it can push water under the shingles.
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Always stand on a dry area of the roof as wet shingles can be very slippery.