Frequently Asked Questions About Roof Cleaning

Ron Musgraves

Exterior Restoration Specialist
Staff member

Frequently Asked Questions​

question


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!)
 

Ron Musgraves

Exterior Restoration Specialist
Staff member

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!)

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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