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How to Prevent Moss and Algae from Taking Over Your Roof

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Key Takeaways

  • Moss and algae thrive in damp, shaded areas, especially on north-facing roof slopes with limited sunlight and where overhanging tree branches provide shade and drop debris.
  • Their growth is more than cosmetic; moss retains moisture that can cause wood rot and shingle deterioration, while algae accelerate wear and cause unsightly black streaks.
  • Preventative strategies include biannual roof inspections, gentle cleaning with appropriate solutions (avoiding high-pressure washing), trimming overhanging branches, and regularly removing debris to reduce moisture retention.
  • Choosing roofing materials resistant to moss and algae, such as metal roofs or algae-resistant shingles containing copper or zinc, helps minimize growth.
  • Installing copper or zinc strips along the roof ridge can naturally deter moss and algae when rainwater washes over them.
  • Professional roof cleaning and maintenance ensure safe, effective removal, preserve warranties, and extend roof lifespan by preventing damage caused by moss and algae.

Written by: Jim Marino

  • CEO of Pinnacle Home Improvements
  • Over 15 Years of Experience in the Home Improvement Industry
  • Featured Expert in 20+ Industry Publications

Table of Contents

A home with a new roof has a commanding, show-stopping appearance in any neighborhood. However, over time, weather and other factors combine to create the perfect environment for moss growth and roof algae. Not only will they detract from the look of your home, but they will also cause considerable damage if you leave them to fester.

Homeowners must stop moss on rooftops, and the best way to do so is with algae prevention for roofs. At Pinnacle Home Improvements, our roofing contractors are committed to quality in craftsmanship and customer satisfaction. In this blog post, we explain the importance of preventing moss and algae growth on your roof as well as share roof moss removal tips to help you care for your home.

Problems Caused by Roof Algae and Moss

Moss and algae commonly grow within the crevices of the shingles on your roof. In time, this causes the shingles to lift up and separate, making them more likely to blow away in high winds. Another problem is that the growth of roof algae and moss can allow water to get underneath the shingles, causing leaks and, over time, structural damage.

Moisture retention is a huge problem caused by these organisms, and the damp environment they create can lead to wood rot that impacts the roof deck and underlying roof structure. Your roof’s integrity can be compromised, putting you and your family in jeopardy. What’s next for your roof when these growths get out of control? Your roof’s lifespan will be shortened significantly, requiring a roof replacement much sooner than you may have anticipated.

Fortunately, you don’t have to let expensive roof problems arise if you work to prevent moss growth. By using a few simple strategies, you can prevent moss growth and algae growth from weakening your roof structure and diminishing your home’s beautiful appearance.

How to Prevent Moss/Algae on Roof

You can’t stop the rain from coming or the sunlight from wearing on your roofing materials. However, if you want a moss-free roof, you should focus on prevention to keep your roof surfaces free and clear of these pesky organisms. Here are several ways you can prevent moss and algae growth from ruining your roof:

Regular Roof Inspections and Maintenance

You won’t give roof algae a chance to thrive if you keep up with your roof inspections and regular roof maintenance. Professionals can examine your asphalt shingles and recommend algae protection or roof cleaning to remove moss and other buildup before they have a chance to cause damage.

Cleaning your roof can also prevent mold growth, an issue that commonly comes up when moss or algae festers on a rooftop. Be careful using a pressure washer, as the wrong setting could cause damage that allows moisture to build up behind your roofing materials. If you’re not sure how to safely clean your roof using a pressure washer, hire a professional company. They will use a safety harness and the right cleaning tools and products, preventing damage to your roof and avoiding serious injuries.

Clean Your Gutter System to Ensure Proper Roof Drainage

Gutters direct water away from your roof and foundation, though they can only do their job if they aren’t clogged with debris. You can get on a ladder to pull out clumps of leaves, twigs, and other items that have lodged into the system. A great way to prevent clogs is by having gutter guards installed. If you don’t have those, then you can remove the debris and use your garden hose to rinse them clear.

However, it can be dangerous getting on a ladder to tackle this chore, especially if you have a two-story home. The risk of injury is great and it may be worth it to pay a pro rather than wind up in the hospital.

Choose Algae-Resistant Shingles

If you are having a new roof installed soon, especially in humid climates, you may want to consider algae-resistant shingles. These naturally deter the growth of these organisms. Resistant shingles prevent algae and moss, making it easier to maintain curb appeal for years to come.

While new shingles will often prevent algae and mold from growing, over time, the oils that repel these organisms will wear away. Shingles that are resistant to these growths have copper and zinc embedded in them to prevent growth over the long term.

Install Copper Strips or Zinc Strips

Zinc or copper strips can be added to your roof along the peak or ridge. When it rains, copper strips and zinc strips will oxidize over the roof plane, making it inhospitable to these growths.

Both zinc strips and copper granules are an excellent addition to existing roofs that are early in their lifespan. If you want to inhibit algae or moss growth, add zinc or copper strips, but make sure to have a professional install them.

Inspector Checking Roof

Eco-Friendly Cleaning Solutions and Their Benefits

Many old roofs can look like new roofs again by following regular maintenance that involves cleaning. However, homeowners often worry about the impacts cleaning products may have. Chemical treatments and chlorine bleach may be effective, though they cause serious harm to the environment. Here are some environmentally-friendly options that you can use on your roof:

Vinegar and Water Mixture

Just like inside your home, vinegar and water make for an eco-friendly way to clean your roof. It works best in a 1:1 ratio that you spray on and leave for 20 minutes before gently washing it away. The benefit of using vinegar is that it is natural and non-toxic, plus, it is adept at breaking down both moss and algae without causing harm to your roofing materials during roof cleaning.

Baking Soda

You can also try baking soda, which is another natural cleansing agent. Baking soda naturally has a higher pH balance, which can naturally inhibit the growth of moss. You can mix it with water for a simple clean or mix it with hydrogen peroxide to treat affected areas of stubborn stains or algae spots.

Soft Pressure Wash

Pressure washing should only be done with care and in a soft setting. This way, you can gently and safely remove moss, algae, mildew, dirt, and grime. However, due to how easily you could accidentally damage your roof during roof cleaning, we recommend that you hire a professional roof cleaner to ensure the best results.

Signs That You Need Professional Intervention to Stop Moss and Algae Growth

With regular maintenance, you can keep moss and algae issues from spiraling out of control. Unfortunately, there may be times when you should call a professional immediately.

Extensive Growth of Moss or Algae

In humid climates, moss and algae can quickly take over in the blink of an eye. If the impact is all over the entire roof, it is best to hire professionals who will be better able to get it under control fast.

You See Shingle Damage

If you notice unsightly moss or algae growing and see damaged shingles, you shouldn’t try to take care of the problem on your own. Your efforts to clean could lead to water behind the shingles, compromising the structural integrity of the entire roof.

Your Home Has Water Damage

Leaks will eventually make their way into your home, leaving ugly brown spots on the ceiling or causing dampness in the attic. It’s likely not the news you want to hear, though professionals are equipped to handle these issues and restore roofs to a structurally sound condition.

You Have Steep Roofs

For homeowners with steep or challenging roof access, don’t try to save money doing it yourself. Professionals have the specialized training and tools to handle these types of scenarios safely.

When you bought your home, you knew you’d be making an investment during the purchase. In order to protect this investment, you need to maintain it. While there are many things you can do yourself, some of them should always be handled by professionals. These growths are a common problem, and there is a great risk in trying to get on the roof yourself. Hiring a pro ensures you stay safe while having the algae and moss removed effectively.

You’ll also prevent added damage by using too much water force and having someone who knows how to spot any underlying damage caused by moss or algae. Above all else, you’ll be able to protect your roof and keep it in tip-top shape for years to come, protecting your investment along with your peace of mind. If you want to discuss shingle options for a roof replacement that can resist algae and moss, contact Pinnacle Home Improvements for more information and a free quote.

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