How to Remove Algae From Your Roof


If you happen to live in an area with high humidity or frequent rainstorms, algae can become a real eyesore on many types of roofing including asphalt shingles, tiles and occasionally metal roofs.

Most roofing companies can quickly identify if those green, black or blue stains on your home’s covering are algae, mold or a combination of both. While pressure washing roofing isn’t generally recommended, these DIY algae removal recipes are safe for most types of roof materials.

Getting Rid of Algae from Roofing

Fortunately, algae are not intrinsically harmful to roofing materials in general, and there are pre-made application liquids and sprays specifically designed for algae removal.

However, you likely have the right ingredients at home already to create a DIY algae eradication solution. Four easy recipe combinations include:

  • 500 ML white vinegar (distilled) w/ 7.5 liters of water
  • 400 GM powdered detergent or oxygenized bleach w/ 7 liters of water
  • 500 ML chlorine bleach w/ 7.5 liters of water
  • 250 ML dish soap w/ 7 liters of water

Be sure to dampen the roof with water prior to applying the cleanser and allow the product to sit for about 20 to 45 minutes. Use a bristled brush to gently scrub away the algae residue and rinse thoroughly.

Safety is a Priority with Roofing Companies—Make it Yours, Too

Be sure to never go on the roof while alone and consider wearing a safety harness for good measure. Always wear proper eye protection and clothing such as gloves, goggles, long pants, sleeve shirts, and shoes with excellent traction. This is a dangerous task, and roofing can become slippery when wet. If you feel uncomfortable, be sure to contact a roofing company to discuss professional cleaning services.

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