Roof Pressure Washing: What You Need to Know

Posted on September 14th, 2020 by Applied Roofing Services

If your roof is dirty with tree branch debris, moss, and several other types of strange things growing on it, is pressure washing your roof the right choice? Remember that there are two main problems with pressure washing your roof. Firstly, it can be damaging to your roof. Secondly, the roof’s warranty may get void if you pressure wash it.

roof power washing

Measures to Be Taken While Pressure Washing

While pressure washing your roof, always keep in mind that the power washer’s output pressure must be controlled accurately. Otherwise, you may end up damaging your roof severely. Another thing to pay attention to is the nozzle size of the washer. If the nozzle size is different than what is required, it can damage your roof. Also, make sure that spraying should be done from the top of the roof and not underneath.

In addition to these, pressure washing your roof may compromise the sealants used in vents, flashing, solar panels, skylights, chimneys, etc. and may ultimately lead to roof leaks. Make sure that the water temperature is not too hot and the angle of the spray is correct. Otherwise, your roof might get damaged.

Also Read – All You Need to Know About Asphalt Roofing Shingles

Problems That May Arise Because of Pressure Washing

Before attempting to pressure wash your roof, you should understand that most of the components used on a roof are not built for enduring pounding, high water pressure. This is especially true in the case of homes with older roofs. When you use consistent high water pressure on such roofs, it can lead to various issues, like:

  • Decreasing the life expectancy and longevity of roofing materials drastically.
  • Breaking the adhesive between shingles.
  • Damaging the underlying fabric of the roofing material.
  • Stripping away the ceramic granules on shingles.
  • Causing cracks in cement, ceramic tiles, clay, slate, shakes, and even in metal.
  • Dispersing fungi, moss, and other organisms to the entire area of the roof.
  • May ultimately result in roof leaks.

Also Read – 5 Types of Roofs Considered the Best for Southern California

Other Cleaning Options That You May Consider

    Here are some ways to clean your roof without damaging it.

  • Use soft washing or a low-pressure wash system with a special nozzle tip for cleaning roof shingles. Remember that this process is not entirely safe as it can harm your roof shingles.
  • Use a hose from the ground level and clean shingles from the top.
  • Use a soft broom or brush from a ladder with proper safety precautions.
  • Use a leaf blower to remove any tree limbs and debris.
  • Try treatment processes that can ward off mildew, moss, algae, fungi, and dirt.

Are you looking for a commercial roofing contractor in California? Feel free to contact Applied Roofing Services today. You can call us at 714-632-8418 or get a quote online.

About Applied Roofing Services

Applied Roofing Services is a full service roofing company located in CA. We offer durable and high quality residential and commercial flat roofing. We provide roof installation as well as roof repair services, roof maintenance and inspection services. We specialize in low slope roofs, energy efficient, zero maintenance, and green roofing. We have 20+ years of experience in the roofing industry.

Friendly Roofing

How to protect your roofing investment by selecting the right roofing contractor?



Orange County Office:

1961 N. Main St.
Orange, CA. 92865
Phone: 714-632-8418 or
(800) 895-9589

Get Directions

Los Angeles Office:

1055 West 7th Street
33rd Floor Penthouse
Los Angeles, CA 90017
Phone: 213-255-3677

Get Directions


San Bernardino Office:

8333 Foothill Blvd
PMB # 411
Rancho Cucamonga CA 91730
Phone: 909-361-6119

Get Directions


Need To Know More?
Download our E-Brochure

Customer Review...

ARS has been my only foam roofing contractor nearly 15 years. There service is excellent and price competitive. I would recommend them highly

Dave A

crrc energystar bbb bestroof