You can spray your shingles with several shingle-safe solutions that clean algae, moss, and dirt without damaging granules or voiding warranties. The most recommended by manufacturers like GAF and Owens Corning is oxygen bleach, sodium percarbonate, mixed with water and mild dish soap. A typical DIY spray is one gallon water, one quart oxygen bleach, and a quarter cup dish soap, applied with a low-pressure garden sprayer from ridge downward on a cool overcast day, allowed to dwell 15 to 20 minutes, and rinsed gently with a garden hose. Commercial products specifically formulated for asphalt shingles are highly effective and easy to use, including Spray and Forget, Wet and Forget Outdoor, and Roof Shampoo. These are no-rinse formulas that you spray on and allow rain and wind to gradually remove dead algae and moss over weeks to months, without pressure washing. For moss, sprays containing potassium salts of fatty acids or zinc sulfate like Moss B Ware, Moss Out, or Wet and Forget Moss are effective. Avoid spraying concentrated chlorine bleach, as it can damage shingles, corrode flashing, and kill landscaping. Avoid pressure washers, harsh detergents, and solvent-based cleaners. Always protect plants by soaking them with water before and after spraying, wear non-slip shoes, and avoid spraying on windy days. After cleaning, consider zinc strips for prevention.
1 votes
Marked as accepted