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Posted by on in Roofs
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Algae or Moss on Your Roof? Here’s What to Do

What Causes Algae and Moss Build-up on my Roof?

Having large trees in your yard is a wonderful landscape feature, but it can encourage the growth of moss and algae. Moss needs shade and a damp climate to grow, and trees provide both. We’re not suggesting you chop down all of the trees in your yard, but moss build-up needs to be treated regularly so it doesn’t affect the longevity of your roof.

Algae is most commonly found in asphalt roofing shingles. You can tell you have an algae problem if your roof appears to be bleeding a black color. While some brush this off as a cosmetic defect, it is actually black algae and should be treated promptly.

How Do I Get Rid of Algae and Moss?

Moss and algae build-up on your roof is more of a cosmetic condition in the short-term. However, left unattended, you could be facing an entire roof replacement. Smaller infestations can be treated by simply brushing or power-washing them away. Be mindful though, as power-washing can strip away older shingles.

There are also chemical options to get rid of algae or moss on your roof.  Powders using zinc sulfates can be sprinkled on growth to kill it, but be careful: getting this in your eye or prolonged contact with the skin can lead to serious irritation or injury.

How Do I Prevent Algae and Moss Build-Up?

It’s always a good idea to keep on top of your roof maintenance because it prolongs the life of your roof and improves curb appeal.  To prevent future problems, you can also add algae- or moss-resistant tiles when you decide it’s time to re-roof.

If you have any questions about moss or algae on your roof, or if you are looking into roof repair, please contact us.


Harry Hink is the owner of HB Services, LLC. He has years of experience in the home improvement field and brings an unparalleled enthusiasm to his customers. HB Services is known locally for their continued support of local communities, schools and businesses.

Harry is active in many organizations to include the Medical Care of Children Partnership(MCCP) which is a community partnership dedicated to providing medical and dental services to children of the working poor of Fairfax County who otherwise are ineligible to receive healthcare offered through Medicaid or other private and public sources. Harry is also a veteran of the United States Marine Corp, a certified United States swimming coach and, most important, a husband and father.

Owner Harry Hink’s philosophy is timeless and simple – do for our customers what we would do for ourselves. Our staff will listen to your ideas, offer insight suggestions and come up with a design that fits your lifestyle and adds value to your home.


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Guest Friday, 28 April 2017

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