Over the years, we’ve compared DIY tips and word-of-mouth cleaning tips against our own service practices, and have found the list below to be a good recommendation on the best materials and techniques to use if you elect to clean a composition roof yourself.
Tips and Tricks:
Use a soft bristle broom to remove all the leaf and pine needle litter.
Use a garden hose to wash off debris, spraying down the slope.
If you have removed the debris and still see signs of Algae (brown or black discoloration), this is the recommended solution:
- Mix a solution of 1 part chlorine bleach, 3 parts water and a pinch pf Trisodium Phosphate. (TSP)
- Apply this solution gently to the surface of the roofing, being careful to avoid damage to other parts of the building and it’s surroundings.
- Avoid scrubbing as well as other physical contact with the roof because the friction may loosen and remove granules that coat the surface of asphalt shingles. Work with a ladder whenever possible, or use “walkboards.”
- Finally, rinse the bleach solution from the roof by gently spraying the surface with water.
Observe all possible safety precautions when working on or near the roof. Besides giving special attention to ladder safety, be advised that the solution application and rinsing process makes the surface of the roof slippery and therefore hazardous to walk on. Also, if you accidentally splash any plants, rinse them thoroughly.
