Start off with a hot water pressure with a 40 degree tip.
Pressure washer metal roof.
We recommend hot water because metal roofs can handle it and hot water is more effective.
The average garden hose sprays water at 40 to 80 psi.
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.
You only need low pressure on metal roofs as it is enough to disturb and clean them.
Pressure washing is very effective but may be best for metal or concrete roofs.
To estimate costs for your project.
When you clean metal you can use light pressure if necessary and you can use a hot water pressure washer.
How to clean various types of metal roofs.
You can also simply wash it with detergent depending on how accessible the roof is and what its pitch is.
Actual costs will depend on job size conditions and options.
By comparison a fire hose sprays at 150 to 300 psi.
Spraying water under your shingles can both tear off the shingles and force water under them and into your home.
Of course some chemicals can harm your roof as well and the runoff could cause problems with your landscape or parts of your home.
This is very effective at getting rid of algae and mildew both of which often grow on metal roofs.
Pressure washers use 1 300 to 2 800 pounds per square inch to strip dirt moss and even paint from a surface.
When you clean a metal roof it s a lot different than cleaning tile or asphalt roof.
For a basic project in zip code 47474 with 500 square feet the cost to pressure wash roof starts at 0 33 0 40 per square foot.