Say Goodbye to Roof Moss with These Easy Steps

Roof Cleaning Portland OR

Is your roof covered in unsightly moss? Not only does it look bad, but moss can also cause serious damage if left untreated. For homeowners and property managers, knowing how to safely and effectively remove moss from a roof is crucial. In this blog post, we’ll walk you through the entire process, from inspecting your roof to applying a biodegradable solution. By the end, you’ll have all the knowledge you need to keep your roof in top shape. Let’s get started!

Why Roof Moss is a Problem

Damages Shingles

Moss tends to grow between shingles, lifting them up as it expands. This can cause shingles to crack or break, leading to potential leaks and water damage inside your home. Addressing moss growth early can prevent these costly issues.

Adds Weight

Believe it or not, moss can add significant weight to your roof. This additional load can strain the structural integrity of your home, especially in older buildings. By removing moss, you alleviate this unnecessary weight and maintain a safer structure.

Harbors Moisture

Moss retains moisture, and this can be problematic for your roof. Constant moisture can lead to rot, mold, and mildew, which are harmful to both your roof and your health. Effective moss removal eliminates this issue.

When to Inspect Your Roof

Seasonal Checks

It’s essential to inspect your roof at least twice a year, ideally in the spring and fall. These seasons provide the best conditions for spotting moss growth and other potential issues. Plus, you’ll tackle problems before extreme weather sets in.

After Storms

Heavy rain, wind, or snow can exacerbate moss growth and other roof issues. Always check your roof after significant weather events to spot and address damage early. This proactive approach can save you time and money in the long run.

Professional Inspections

While regular self-inspections are important, consider hiring a professional for a thorough check-up once a year. Experts can spot issues you might miss and offer specialized advice.

Tools You’ll Need

Safety Gear

Safety should be your top priority when working on a roof. Equip yourself with non-slip shoes, a safety harness, and gloves. These items will help protect you from falls and injuries.

Brushing Tools

A soft-bristled brush or broom is essential for gently removing moss without damaging your shingles. Avoid using metal brushes, as they can scratch and harm your roof.

Biodegradable Solution

Opt for a biodegradable cleaning solution to safely kill moss without harming the environment. This type of solution is effective but gentle, ensuring your roof stays in good condition.

Step-by-Step Roof Moss Removal

Step 1 — Initial Inspection

Before you start removing moss, inspect your roof to ensure it’s in good shape. Look for any damaged or missing shingles and address these issues first. This step ensures your roof can handle the cleaning process.

Step 2 — Gently Brush Off Moss

Using a soft-bristled brush, gently scrub away the moss. Start at the top of your roof and work your way down. This method prevents you from accidentally pushing moss under the shingles. Be patient and thorough.

Step 3 — Blow Off Debris

Once you’ve brushed off the moss, use a leaf blower to remove any remaining debris. This helps clear your roof and prepares it for the next step. Make sure to blow debris away from your gutters to prevent clogs.

Step 4 — Apply Biodegradable Solution

Now it’s time to apply your biodegradable solution. Use a soft wash system to spray the solution evenly across your roof. This will kill any remaining moss and prevent regrowth. Follow the manufacturer’s instructions, including guidelines from shingle manufacturers and the Asphalt Roofing Manufacturers Association (ARMA), for best results.

Step 5 — Final Inspection

After applying the solution, inspect your roof again to ensure you didn’t miss any spots. This final check ensures your roof is completely moss-free and ready to withstand the elements.

Preventing Future Moss Growth

Regular Maintenance

Consistent roof maintenance is key to preventing moss growth. Clean your roof and gutters regularly to remove debris that can encourage moss. This simple step can make a big difference.

Trim Overhanging Branches

Trees that hover over your roof provide shade and drop debris, both of which promote moss growth. Trim back any branches to allow more sunlight to reach your roof. This reduces the likelihood of moss taking hold.

Understanding the Benefits of Professional Services

Expertise and Experience

Professional roof cleaners have the expertise and experience to handle moss removal effectively. They know the best techniques and products to use, ensuring your roof is cleaned safely and thoroughly.


Removing moss from a roof can be a time-consuming task, especially if you’re not experienced. Hiring professionals allows you to focus on other important tasks while they handle the cleaning efficiently.

Guaranteed Results

When you hire a professional service, you can expect guaranteed results. If moss returns within a certain period, many companies will come back and treat your roof again at no extra cost. This peace of mind is worth the investment.

DIY vs. Professional Removal

Cost Considerations

DIY moss removal can save you money, but it also comes with risks. Without the right tools and knowledge, you might damage your roof or miss spots. Professional services cost more upfront but can save you money in the long run by preventing damage.

Safety Concerns

Working on a roof is dangerous, especially if you’re not used to it. Professionals have the safety gear and training to minimize risks. Consider your comfort level and physical ability before deciding to tackle moss removal yourself.


While DIY methods can be effective, professionals have access to specialized tools and solutions that might work better. Weigh the pros and cons of each approach to decide what’s best for your situation.

Common Mistakes to Avoid

Using Harsh Chemicals

Harsh chemicals can damage your roof and harm the environment. Stick to biodegradable solutions to ensure safe and effective cleaning.

Ignoring Safety

Don’t underestimate the importance of safety gear. Always wear non-slip shoes, gloves, and a safety harness when working on your roof. Your safety is paramount.

Skipping Maintenance

Once your roof is clean, don’t neglect regular maintenance. Keep an eye on your roof and take action at the first sign of moss. Consistent care is the best prevention.

Final Thoughts on Roof Moss Removal

Long-Term Benefits

Removing moss from your roof offers long-term benefits. You’ll extend the life of your roof, improve your home’s appearance, and avoid costly repairs. The effort you put in now will pay off in the future.

Professional Help

Don’t hesitate to seek professional help if you’re unsure about removing moss yourself. Experts can provide valuable assistance and ensure the job is done right. Your roof is a significant investment, and it’s worth protecting.

Stay Proactive

The key to a moss-free roof is staying proactive. Regular inspections and maintenance will keep your roof in top condition. Take action at the first sign of moss, and you’ll enjoy a beautiful, functional roof for years to come.


Removing moss from your roof doesn’t have to be a daunting task. With the right tools, techniques, and a bit of patience, you can keep your roof in excellent condition. Remember, regular maintenance is key to preventing moss growth and protecting your investment.

For those who prefer a professional touch, Premium PowerWash is here to help. Our expert team will ensure your roof is moss-free and looking its best. Contact us today to book a service and experience the difference.

Start your moss-free roof journey now!