There is a chance that the pressurized water could damage your shingles.
Pressure washer metal roof.
Start off with a hot water pressure with a 40 degree tip.
Never aim your pressure washer up the roof as it can push water under the shingles.
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.
Of course some chemicals can harm your roof as well and the runoff could cause problems with your landscape or parts of your home.
How to clean various types of metal roofs.
We recommend hot water because metal roofs can handle it and hot water is more effective.
Roof moss removal cost.
The average garden hose sprays water at 40 to 80 psi.
Pressure washers use 1 300 to 2 800 pounds per square inch to strip dirt moss and even paint from a surface.
You can also simply wash it with detergent depending on how accessible the roof is and what its pitch is.
When you clean a metal roof it s a lot different than cleaning tile or asphalt roof.
To estimate costs for your project.
By comparison a fire hose sprays at 150 to 300 psi.
Pressure washing is very effective but may be best for metal or concrete roofs.
This is very effective at getting rid of algae and mildew both of which often grow on metal roofs.
Spraying water under your shingles can both tear off the shingles and force water under them and into your home.
You only need low pressure on metal roofs as it is enough to disturb and clean them.