Moist, shady conditions cause black streaks to appear on shingles. These stains form when algae is present, and they are a common problem in humid climates. After completing the following steps, the algae-streaked roof will be restored to its original condition.
Use The Following Items
Remove Existing Stains
Use a couple vinyl tarps to cover plants and grass that are located next to the garage so that the cleaning solution does not drip on them as you are cleaning the roof. Set up a ladder next to the garage and make sure that it is sturdy before you climb it. Remove debris and dirt from the roof with a broom. Rinse the roof off with a water hose.
Add equal parts of bleach and water to a garden sprayer's tank. Apply the cleaning solution to the black streaks. Wait a few minutes for the cleaning solution to penetrate the algae stains. Use a roof brush to scrub each of the stains until they are no longer visible. Rinse the roof off well with a water hose.
Prevent Future Stains
Keep the roof clean on a regular basis to reduce the amount of time that it will take you to remove stains in the future. If you would like to prevent algae stains from forming altogether, install zinc strips across the top of the roof. The zinc in the strips will drip down onto the rest of the roof when it rains and form a protective barrier that will prevent algae from developing.
Measure the length of the roof to determine how many strips you will need. Use a putty knife to gently lift up the bottom edge of the shingles that run across the top of the roof. Slide the top of each zinc strip underneath the shingles.
Use a hammer or nail gun to drive roofing nails through the top corners of each strip. After the zinc strips cover the length of the roof, place additional strips across the other side. The zinc strips will last for years. They are not only useful for preventing algae, they are also effective in preventing moss growth, too.
After cleaning the algae stains and protecting it from future stains, your garage will look neat and well maintained. If the algae problem proves to be more than you can handle, contact a professional roofing contractor, such as those at Acoma Roofing, to handle the problem for you.
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