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"I want my asphalt shingle roof cleaned"

My roof has dark black streaks, some red streaks around the chimney and some visible mold and fungus in the shaded areas

wanted by: mitch (317) in Natick, MA 01760 +
updated on: Oct. 9, 2012, 10:18 p.m. (7 years, 4 months ago)
posted on: Jan. 20, 2011, 10:44 p.m. (9 years, 1 month ago)
tags: exterior home improvement roof roofing
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4 User Replies

Asphalt Shingle Roof Cleaning: My Advice and Recommendation

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Homeowners who see prominent black streaking, discoloration, fungus and mold on their shingles often assume that they need to replace their roof. What they typically need is a roof cleaning.

As you can imagine, cleaning a roof is a fraction of the cost of replacing one. For a 1,500 to 2,000 square foot house with a relatively uncomplicated roof you can expect to pay between $500 and $800 for a roof cleaning. By shopping around and getting cost estimates from as many local professionals as you can you increase your chance of hitting the lower end of that range.

The process of cleaning an asphalt roof is pretty simple. First find a professional roof cleaning company in your area. The roofing contractor will spray-wash your roof with a mixture of water and herbicides. This will effectively wash away the current mold, lichens and fungus and prevent it from coming back for a specified period of time. That time will depend on your location and what mixture, so your best bet is to contact a local professional to get specific details.

If you are tempted to pull out your ladder and power washer to do the washing yourself, I recommend that you don't. Besides the danger of weilding a heavy piece of equipment on a wet roof, there is a high likelihood that you will damage the asphalt shingles with your power washer if you are not exceptionally careful. Also, a local professional will be more knowledgeable about what herbicides and cleaning agents work in your geographic area.

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Cost to clean an asphalt shingle roof: $600

Last year when I was selling my house in Mount Lebanon, PA (just south of Pittsburgh) my real estate broker noticed that the asphalt shingle roof of my house was stained, discolored and "old looking".

At first, he thought I might have to get my roof replaced in order to sell the house. He also suggested that I first try getting it cleaned to see if that would restore it to a condition where a potential buyer wouldn't notice it as a major issue.

I called a local roof cleaner, they came and took a look, gave me a price quote of $600 and came out a few days later. They had a crew of two people and spray-washed the roof with some water and a cleaning agent and were done within 3 hours.

The two roof cleaners successfully restored the roof to a like-new appearance and I successfully sold it a month later, which is a borderline miracle in this economy and housing market.
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Re: I want my asphalt shingle roof cleaned

Ugly Shingles, LLC. | Certified Roof Cleaning Contractor.

What you have on your roof is a form of mold and bacteria. Many years back they switched over to a fiberglass based shingle in place of the old asphalt based. The new fiberglass based shingles were very light so they added crushed limestone to make them heavier.

The limestone is the issue. The wind-blown particles will attach themselves to the shingles and start to feed. The black steaks will appear a short time later as a protective shade. This typically happens on the northern side and areas with very little sun exposure.

DO NOT POWERWASH YOUR SHINGLES. You will completely damage your roof as well as void any existing warranty you may have. We at Ugly Shingles, LLC. use a Non-Pressure Soft-Wash System. Our system is certified and recommended by all shingle manufactures.

The cost is usually around $400 - $600. However, it really all depends on your situation. If you would like, I can provide you with a no obligation estimate using our state of the art software. We will provide you with a quote and some possible steps to prevent this from happening again.

You can send your address to [email protected] and one of our staff will take a look. Your roof is literally being eaten! This will result in premature shingle failure; unnecessarily costing you thousands of dollars. Visit us at: for more information.

Vice-President of Operations
comment Thanks Steve, very informative! I see that you are based in Michigan, what is your service area for roof cleaning? - mitch 9 years, 1 month ago
comment You're very welcome! Our main office is based in Michigan. However, we do service customers all over the United States. We would set you up with one of our crews if you think this is something you would like to move forward with. Please feel free to contact us at anytime. Thank you! - uglyshingles 9 years, 1 month ago
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Other wants like "I want my asphalt shingle roof cleaned"

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Shingle Roof Cleaning: Advice and Services

roof cleaning before and afterTop: before roof cleaning
Bottom: after roof cleaning

Sometimes you get lucky and you don't have to throw down thousands of dollars to replace your asphalt shingle roof. Sometimes all you need is to throw down hundreds of dollars for a professional roof cleaning (it's all relative).

The ubiquitous asphalt roof shingle is relatively inexpensive, easy to install and long lasting, but it is susceptible to pesky things like algae, mold, fungus and dirt which can make your otherwise pristine home look shabby and worn. Fortunately, there is a simple solution: a roof cleaning.

If your home's roof is not too steep and not excessively high, you can attempt the washing yourself with a hose and a simple bleach or citric acid solution. We don't recommend this, however, since you can very easily do more harm than good if your 2600 psi power washer hits your shingled roof at the wrong angle.

This job is best left to the professionals. Let them be the ones to climb on top of your hot roof, get filthy, soaking wet and have to deal with covering up all your nice shrubbery so the cleaning agents and herbicides don't harm them.

Some jobs are worth paying someone else to do...

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