Mistakes To Avoid When Cleaning Mildew And Moss From Your Roof

10 January 2019
 Categories: , Blog


If you have an asphalt shingle roof and notice a great deal of mold and moss on the surface, then you should clean it off as soon as possible. Mold, mildew, and moss can easily cause substantial shingle damage that requires a replacement. And, while you should get to cleaning as soon as possible, there are a few mistakes that you can easily make that can actually damage your roof in the process. Keep reading to learn what they are.

Using A Pressure Washer

It is wise to use water to remove mold and mildew if you can. And while it may seem as though a higher pressure water spray will release the debris easier, quicker, and more efficiently, you should never use a pressure washer to clean your roof.

While some pressure washers are made for light duty and release about 1300 PSI of water, this is significantly higher than a normal garden hose that has an upper pressure limit of 500 PSI. And the higher pressure can easily force shingles upward and cause them to bend or rip away from the roof completely.

Also, if you use a pressure washer, then you will need to activate the device while standing on an extension ladder. The spray from the washer can cause a back blow that can easily knock you off the roof.

All of these things can easily be avoided by using a plain garden hose instead of a pressure washer.

Using Strong Chemicals

There are a wide variety of chemicals and compounds that can be used to kill mold and mildew. And, many of them contain strong chemical agents, like didecyl dimethyl ammonium chloride. These chemicals can dry out the shingles and make them brittle and they can also cause the protective granules to release from the roof. Also, the chemicals can flow off the roof and kill the trees and plants on the ground.

Before you use any sort of chemical or cleaner on your roof, you should use a broom or brush to see if the moss can be easily removed once it has been wet down. If it remains, add a small amount of bleach to a water bottle and spray a mist of the bleach on the moss and mildew. You can add the bleach once a day for several days, and the moss will begin to die and loosen.

Try to scrape off the moss after two to three days of treatment with bleach.

If you are having difficulty cleaning your roof, then speak with a roofing professional about the best way to release moss and mildew. Companies like Cloise & Mike Construction Inc can help.


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