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10 Steps for Getting Rid of Algae on Your Roof

October 17, 2022

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Do you need to get rid of algae on a roof? If so, consider calling a pro! Expert power washing removes algae as well as mold, mildew, moss, storm debris and more. Additionally, professional cleaning ensures a safe, effective job without the risk of damaging shingles and other materials.

However, if you’re not quite ready to call the pros, consider a few tips on how to tackle this problem with roof cleaning. These simple steps can keep those algae from growing while also keeping damage to a minimum. Moreover, this can also keep your roof cleaner and more presentable in between visits from a power washing contractor!

What Causes Algae on Roofs?

To better understand how to get rid of algae on roof, it helps to know how and why this substance forms. First, note that “algae” is plural, and the word refers to groups of certain organisms. Like mold, clusters of algae grow from spores once they settle along roof surfaces and materials. Also, as with mold, algae thrive in dark, damp environments.

In turn, anything that holds dampness against your roof risks algae growth, including an overly humid environment! Additionally, risks for algae growth include overhanging tree branches that drop debris onto a roof and poor roof ventilation. Clogged gutters also risk standing water that encourage mold, mildew, and algae.

In some cases, overly porous roof materials hold moisture that encourages algae and other growth along a roof. Heavy rains and not cleaning that roof as needed also allow conditions needed for algae to thrive!

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Is Algae on a Roof Bad?

Before you go another day without addressing algae on a roof, note why it’s vital to remove it promptly! As always, discuss any specific concerns with a roofer or power washing contractor. He or she can also provide valuable insights as to your property’s condition overall!

  • While algae grow in damp conditions, they also help hold that moisture against a roof. In turn, your property risks wood rot and other structural damage. Dampness also breaks down asphalt shingles and risks rusted nails and other connectors.
  • Algae, moss, and other contaminants often leave behind unsightly stains. In time, even the best power washer might not be able to remove that discoloration.
  • Algae, mold, and mildew can affect air quality around your structure. Consequently, you might notice asthma or allergy triggers if you neglect to remove algae.
  • Many damp contaminants also produce unpleasant odors! On the other hand, removing algae, mold, mildew, moss, and other grime ensures a clean, pristine property.

Lastly, consider that all these issues often affect property values. An appraiser figures those values based on what potential buyers might pay for a property. Since algae and other growth risk damage and create an unsightly appearance, they make your property less attractive to buyers. Consequently, its values might then plummet!

How to Get Rid of Algae on Roof and Keep It Off for Good!

Here are 10 tips for getting rid of algae on your property’s roof and keeping it off for good. When considering these tips, always keep yourself safe! Have someone assist you when on a ladder and wear eye protection when needed.

1. Start with a thorough rinse

To get rid of algae on a roof, start with a thorough rinse. Avoid using high-pressure sprays and stick to a low-pressure garden hose nozzle. Start at the roof’s peak and work your way downward. Also, work slowly so gutters can direct algae and other debris to nearby downspouts without clogging or overfilling.

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2. Use a bleach and water mixture

After a thorough rinse, mix standard chlorine bleach and water in a 50:50 ratio. Use a garden hose attachment and apply this to the roof. Again, use low-pressure nozzles and avoid too much pressure on a property’s roof.

Let this mixture sit for 15-20 minutes so it can saturate the roof and kill as much algae as possible. Then, use your low-pressure nozzle again to rinse the mixture away.

3. Add more mixture as needed

If spraying your bleach and water mixture isn’t effective, create another batch in a bucket. Then, minding your safety, pour this mixture along the roof from the peak down. Again, let it soak and saturate the algae for several minutes before rinsing it off.

4. Try a commercial cleaner

Commercial algae cleaners might offer more effective than standard bleach and water. If you’ve tried a homemade mixture, visit your local home improvement store for an algae remover. Mix and apply the material according to package directions. Also, note if it requires rinsing and never miss this step, as leaving behind detergents often risks roof damage.

5. Clean and clear the gutters regularly

Preventing algae growth is vital for protecting your property’s roof. One excellent tip for algae prevention is to keep gutters clean and clear. Two, consider investing in gutter guards, to keep out debris. Also, if this doesn’t stop clogs, ask a roofer about installing larger gutters on your property.

These are important steps as clogged gutters allow for standing water. Roofing materials can absorb that water easily. In turn, that damp environment encourages algae growth, along with mold, mildew, moss, and other contaminants.

6. Trim away branches

Check if nearby tree branches hang over your property’s roof. If so, it’s time for some trimming! Branches often drop leaves, twigs, moss, and other debris onto nearby surfaces. That debris holds dampness against shingles, tiles, and other materials. In turn, algae might grow and spread quickly.

In addition, that debris often ends up in a property’s gutters, risking clogs. Trimming back branches then protects a roof from algae, mold, and water damage. Keeping debris off the roof also improves its appearance overall!

7. Apply copper or zinc strips

Copper and zinc have natural properties that discourage algae, mold, and other growths. You can find these strips at virtually any hardware or home improvement store. Applying strips to the roof peak or ridges allows the copper to drip down the roof, keeping algae from developing. These strips have application instructions on the package, making it easy to install them yourself.

8. Check if roof vents need clearing or repair

Roof vents let out heat as well as humidity. Damaged or blocked vents allow that humidity to build up in a home’s upper story or attic. In turn, that humidity encourages algae, mildew, and other growth.

If you’re not sure how to check roof vents, call a roofer or power washing professional. He or she can ensure they’re in good condition and free of debris. A professional might also suggest how to keep those vents functioning properly, for maximum protection along a structure’s roof.

9. Choose algae-resistant shingles

When it’s time for reroofing, invest in algae-resistant shingles. Manufacturers create these with copper granules mixed in with standard granule materials. Copper offers excellent resistance against algae growth, keeping your roof clear for years!

10. Invest in professional power washing regularly

Professional power washing removes storm debris and other damp materials from roofs. Also, pressure washing can kill growing algae spores. In turn, you’re less likely to see algae develop on your home’s roof if you invest in professional roof-washing services.

Tampa Bay Pressure Washing Services is happy to offer this information on how to get rid of algae on a roof. Hopefully, you found it helpful! If you’re in the market for expert care, call our Tampa Bay pressure washing contractors. We offer FREE quotes and guaranteed results. To find out more, call us right now!

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