Algae growth causes a dark discoloration on roofs. The algae is
usually brown to black in color which results in a streaked, dirty
looking rooftop. It can be mistaken for soot, dirt or tree droppings,
which typically produce only localized discoloration. It's caused
by the growth of airborne algae which deposits on your roof. The
good news is that algae growth does not affect the service life
of your roofing material. It occurs most often in warm, humid climates
such as the Southeast (where algae-resistant shingles are available).
Discoloration of roofs caused by fungus or algae is difficult to
remove, but may be lightened by spraying a diluted solution of chlorine
bleach, trisodium phosphate, and water onto the roof. Solutions
range from one cup TSP, one gallon bleach and four gallons of water,
to one cup TSP and 2.5 gallons each of bleach and water. This solution
can then be rinsed from the roof in 10 to 15 minutes. Do not scrub.
Scrubbing will loosen and remove granules. After spraying be sure
to thoroughly flush the roof and the greenery around the home (grass,
bushes and shrubs) with water. The effectiveness of this type of
cleaning may only be temporary, and the discoloration may recur.
High pressure washing is not recommended due to the possibility
of removing granules, thereby shortening the life of the Roofing
For the average
homeowner this process can be difficult and dangerous to do on their
own. Again, household and store bought chemicals are only a temporary
solution. However, there are alternatives. Working with better cleaning
solutions by a certified roof restoration company will undoubtedly
return better results. Patton General Contracting* is a certified
installer of RoofLock - a product designed to clean and protect
your roof from this type of issue. Visit
here for more information.
For a more
permanent solution, re-roof with Owens Corning Algae-Resistant Shingles.
They are specifically designed to inhibit most algae growth for
extended periods of time and are backed by our strongest product
and algae resistance warranties* available to homeowners.
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Other Issues You May Have
with any type of work you personally do on your home or in this
case inspecting your roof, please use caution and safety equipment.
If you do not feel comfortable inspecting your roof or you have
trouble knowing what exactly to look for, please feel free to contact
us for a free consultation.