Frequently Asked Questions


How do I know if my roof is dirty?

It is easy to see on most homes while the growth is in process; there are dark black streaks all over the place. (Starts on the north part first) Though once the algae has fully taken over it is sometimes hard to tell. (No, its never to late!)

roof is dirty

The best place to look to find out if your roof is dirty is on the down-side (under) of the chimney, the metal vent pipes and/or the vents. There you should find a lighter color... That is the original color when you have a clean roof. And that is what yours will look like after we are done with the roof service!

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How do I figure out my costs?

Use our online form here.

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How do I figure out the pitch?

Measuring Pitch is pretty difficult and really not needed. Most roofs are between 3:12 - 9:12, if that's you, we will charge 20% for the pitch. If you look at your roof and think, "That is so steep I wouldn't even get up there." Then we will probably charge you 36% for the pitch. Read below for more details.

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Low-pitched slope:

Have at least a 3:12 pitch, which means that a roof rises 3 feet for every 12 feet of its base horizontal length. This type is considered to be walkable, and easy for performing a roof cleaning.


Medium-pitched slope: Medium-pitched slope

Fall within 6:12 - 9:12 roofing slope range. This kind requires special equipment such as roofing jacks, and planks to perform cleaning. They represent a higher degree of complexity and are more time to clean.


High-pitched slope: High-pitched slope

Anything steeper than 9:12 roofing slope. The high-sloped roof is perhaps the most difficult roof to work on. Because these are non walkable, you may expect to pay a higher price. High sloped roofs command the use of special protective fall equipment. Hence our justification for a higher price.

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What are the black stains?

The black stains are caused by algae that grow on limestone, they are actually caused when the algae begins to decompose. Often, these black or dark brown stains are mistakenly thought to be dirt, tree droppings, mold, fungus or mildew. There are other types of fungi and algae that can also cause staining, like green stains sometimes seen on roofs. However 99% of roof stains are caused by Gloeocapsa Magma.

Algae growth on roofs occurs to varying degrees in all regions of the country, especially those subjected to warm humid conditions. (Like Houston) Nearly all types of roofing are susceptible to staining and discoloration. It is, of course, most visible on lighter colored roofs and less visible on darker shades of roofing.

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Will pressure washing do any damage?

Yes. Pressure washing with high pressure at a close range can and will dislodge the granules from the surface of the shingles and can scar the shingles causing more problems then you started with. Not only that, but pressure washing alone will not help with the mold and algae roof stain removal. To stop the algae from growing and feeding you need the roof cleaning products.

We use a no pressure procedure to clean your roof. We just apply our A.R.M.A approved chemicals to the roof and use a garden hose to rinse the algae and mildew from your roof without damage. The roof cleaner is what does all the work, the roof cleaner dissolves the mold, mildew and algae so that we can use a no pressure rinse to wash away the roof coatings.

Take a look at the Asphalt Roofing Manufacturers Association web page.

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Will bleach or chlorine damage my roof?

Absolutely Not. Somewhere, somehow there has become a negative view on using Bleaches and Chlorines. Using these chemicals is actually recommended by the roof manufactures. They actually go on to say that high pressure washing systems should Not be used for removing algae.

The Asphalt Roofing Manufacturers Association has written a technical bulletin addressing proper cleaning procedures for asphalt shingle roofs with this growth, and it is those procedures that we follow exclusively.

As for your plants and grass, we take all precautions in handling your landscaping. We have 2-3 person teams to make sure everything is watered before, during and after to dilute all chemicals. We take care of your home and lawn as though it is our own.

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Should I do-it-myself or hire a professional?

Doing your roof cleaning yourself is really up to you. You need to ask yourself this question, "Is saving the labor costs worth the risk of damaging my roof, or worse, falling off?" You can buy roof cleaner at the local hardware stores, but we find that most people are not satisfied with the results. The wrong roof cleaner can leave you with streaks and dead plants and grass. In addition, the roof becomes wet and slippery while cleaning making it unsafe and not recommended without proper equipment.

So to help answer this question, (of course we feel) hiring a professional is always the better option.

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Will cleaning my roof really save me money?

Yes. Cleaning your roof can save you money in more ways then one...

  • First, the algae and fungus that grows can cause premature roof granule loss, and shorten roof shingle life. So you save money because you roof lasts longer and you won't need to replace it.
  • Second, when the algae turns your roof black, it becomes less reflective, and it retains heat; so your air conditioner works harder to overcome the increased heat load, costing money in electric bills.
  • Third, the aesthetics of cleaning your roof when it comes to selling your home can not only save you money but can make you money too.
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What areas do you service?

We service all of Houston and its surrounding area. Including but NOT limited to: Clear Lake, Friendswood, League City, Webster, Dickinson, Santa Fe, La Marque, Texas City, Galveston, Pasadena, Baytown, Spring/Humble, Woodlands, Katy, Sugarland, Richmond, Alvin and almost any other city in the Houston area....If you live in or around Houston, we want to clean your roof!!

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Do I need to do anything before you come?

It does make things easier for both of us if you could do a few things the night before we come out to do the roof service:

  • Put all lawn equipment, furniture and/or toys inside.
  • Keep all animals inside or locked-up out of way.
  • Put any special plants away or out away from house.
  • Park vehicles on street or in garage.

**Pretty much just clear everything out away from around the house.

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How long does it take?

Roof cleaning from start to finish with an average area of 2,000 sqft can take anywhere from 2 - 4 hours. For a 2,000 - 3,000 sqft it takes about 3-5 hours. Other factors like if it is multi-layer and/or has many gables and angles cause it to take longer.

Roof cleaning is a full day's job!

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How noisy is it?

Not noisy at all. Our chemical pump hardly makes a sound and the rinsing process is done with a no pressure garden hose, which isn't loud either. The only noise you might hear is the occasional light thump from us walking the roof, and that's only if we have to get on the roof.

**We do recommend that you schedule us on a day you are not home for your own convenience.

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Do you have references?

Yes. We have many happy customers who would love to share their roof cleaning experience with you, so if you are still unsure about out roof service and would like a list of references please feel free to email us at CustomerService@GotADirtyRoof.com

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Are you insured?

Yes. We are insured by Joe Walters Agency for $1 Million. And we will happily send you a copy of our insurance upon request.

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