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This Old House - Do-it-Yourself

Prevent and clean black streaking on roofs

Written by Posted On Sunday, 25 June 2017 21:12

Black stains or streaks on the roof is a more or less an ordinary thing. These black stains can be of algae, fungus, moss or something else. These are common. However, they look ugly at the same time. They are the signs of damage to your roof shingles. Slowly, they destroy the long life of the shingles. It is necessary first to know what are these streaks and stains.

What are black streaks?

Black stripes on the roof are actually known as Glococapse magma. This is more likely a form of algae that will grow fastly if you live in a humid area. If not checked properly, it will worsen the condition of the shingles. black Streaks

Rain- a natural resistant of growing algae:

As a matter of fact, the rain is a natural resistant of growing algae, moss or fungus. But if the algae or fungus is grown already, then it does not remove it.


You can prevent these black stains from developing by installing algae resistant shingles. Nowadays, the roof manufacturer's have started to add copper granules in the roofing goods at the time of manufacturing. That process is so efficient that it resists the growth of fungus. While replacing the roof, must install this kind of shingle.

Moreover, if you don’t want to install the new roof or to replace the roof, then at once apply zinc or copper strips. This can also prevent the stains from growing.

Cleaning the streaks:

We can remove the black streaks by cleaning them. But most of the time they return. You can use chemical products, but they can damage your roof. So make use of the products that are less harmful. They are available in the market like bleach and water mixture, trisodium phosphate(TSP) mixture, oxygen bleach, etc. these are less damaging to your roof and can lighten the streaks.

Required things for cleaning:

Pump sprayer


Cleaner mixture

Hose with Nozzle spray



Old clothes


Non-slipping shoes

You know that cleaning the roof is so dangerous and naturally wet floor is even more unsafe. It is better to have precautions for this. For your safety, wear glasses and non-slipping shoes and have a rope beside you so that it can save you if your slips. As you are going to work with the chemicals, so wear gloves so that it cannot harm your eyes and skin.

Start cleaning:

Consider cleaning the roof on a cloudy day. As on a sunny day, the cleaner may evaporate fastly and all your hard work will no use. Now make the mixture.

Use one-quarter of bleach.

One gallon water.

One-fourth cup of trisodium phosphate (TSP) you can use another chemical instead of trisodium phosphate.

After this, put this mixture in the sprayer. Spray it on the roof after mixing.

After this process, leave the roof for 15 to 20 minutes and then rinse it with a hose. If you feel that the black or algae streaks are not removed correctly, then repeat the above mentioned same process again.

Removing or cleaning black stains from the roof is not a difficult task at all. You can do it by yourself after taking help from the procedure mentioned above or can ask a professional for his supervision. Make sure that you clean the mixture from the roof properly. Otherwise, it will harm the shingles. Apart from that, occasionally checking is also needed so that you become aware of the condition of your roof. Otherwise, you will likely to have a significant problem. If your roof is damaged and beyond repair then you need to get in touch with professional Roofing contractors for estimation of new Roof cost in Michigan.

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