Will Roof Cleaning Damage or Protect Your Roof?

By Top Dawg Pressure Wash Blog 0 Comments

It’s a fair concern. You look up at your roof, spot patches of moss or streaks of algae, and wonder: Should I clean it—or will that just cause more damage? This hesitation is common among homeowners, especially those with asphalt shingle roofs.

Let’s get one thing straight: roof cleaning is not inherently damaging. In fact, when it’s done properly, it can extend the life of your roof, protect your home’s structure, and even save you money. The key is using the right method and having the job done by professionals who understand how to clean asphalt shingles safely.

In this article, we’ll break down the common misconceptions, walk you through the step-by-step process we use at Top Dawg Pressure Wash, and explain why the idea that roof cleaning is harmful is—mostly—a myth.

Why the Confusion? Blame Pressure Washing

The root of most fears about roof damage lies in a simple misunderstanding: people hear “roof cleaning” and assume it means pressure washing.

That’s a dangerous assumption.

Pressure washing, which uses high-pressure jets of water to blast away dirt and debris, is a fantastic tool for driveways, sidewalks, and some types of siding. But on a roof—especially one made of asphalt shingles—it’s a terrible idea. Here’s why:

It strips protective granules off your shingles
It can force water underneath the shingles, leading to hidden leaks and rot
It often voids your manufacturer’s warranty
And it can even cause fiberglass mat exposure, which weakens the shingle structure

So yes—pressure washing can absolutely damage your roof. But at Top Dawg Pressure Wash, we don’t use pressure washing for roofs. Instead, our team of trained roof cleaning specialists uses a gentle, science-backed technique called soft washing, delivered with care and precision. If you’d like to learn more or schedule an inspection, just give us a call at (778) 539-8948—we’re here to help you get the most out of your asphalt shingle roof.

What Is Soft Washing—and Why Is It Safe?

Soft washing is the industry gold standard for cleaning asphalt shingle roofs. It relies on low-pressure water—about the strength of a garden hose—combined with a chlorine-based cleaning solution specifically formulated to kill moss, algae, and lichen at the root.

Here’s our exact process, step-by-step:

1. Full Roof Inspection

Before we clean anything, we conduct a full roof inspection. We look for:

Shingle wear or fiberglass exposure
Bent or damaged ridge caps
Any signs of leaks, granule loss, or flashing issues

This gives us a clear picture of your roof’s health and helps us identify any problem areas before cleaning begins.

2. We Prioritize Safety—For Your Roof and Our Crew

Next, we install safety gear, including harnesses, anchors, and lifelines. But safety isn’t just about fall prevention—it’s also about protecting your roof during the job.

Walking on shingles improperly can crack tiles, dislodge granules, or damage ridge caps. Our technicians are trained to:

Step only on structurally secure areas
Avoid vulnerable edges and overlaps
Distribute their weight evenly
Minimize foot traffic whenever possible

This expertise ensures your roof is not only cleaned—but also protected throughout the process.

3. Brush Moss That’s Larger Than a Credit Card

We only brush select moss patches—specifically, those that are bigger than a credit card. And when we do, we use soft-bristled brushes with minimal pressure. The goal isn’t to scrub—it’s just to help speed up the visual results in the thickest areas.

Why not brush everything? Because asphalt shingles are topped with UV-protective granules, and brushing too aggressively could dislodge them. Less is more.

4. Rinse and Leaf-Blow Loose Debris

Before applying any solution, we remove twigs, leaves, and surface debris, directing them into the gutters. This prevents blockages and prepares the surface for cleaning.

5. Clean the Gutters

Clogged gutters lead to overflowing water, ice dams, and foundation issues. We clear your gutters as part of every roof cleaning service, making sure your roof drainage system works as intended.

6. Apply Soft Wash Solution from Top Down

Now comes the core of our method: we gently spray our soft wash solution, starting at the ridge line and working down toward the eaves. This ensures even coverage and full saturation of moss and algae.

The solution is designed to break down organic growth at the root without harming your shingles, flashings, or surrounding landscaping.

7. Let Nature Take Its Course

This part surprises most people: you won’t see instant results. Moss doesn’t vanish overnight.

After treatment, it takes 6 to 8 weeks for the moss to dry out, die, and naturally detach. Rain does the rest. It’s slow by design—because aggressive removal causes damage.

In cases of heavy buildup, we may brush some areas for cosmetic purposes—but always with great care. Every decision is made with your roof’s longevity in mind.

Bonus: Before-and-After Photos on Every Job

After the cleaning is complete, we provide before-and-after photos to every homeowner. These photos document the results and give you confidence that the job was done thoroughly and professionally. It’s part of our quality guarantee and helps you track your roof’s condition over time.

Still Worried? Let’s Debunk Some Common Myths

We hear these questions all the time:

1. “The chemicals will destroy my roof.”

Nope. We use a chlorine-based formula specifically designed for asphalt shingles. It’s strong enough to kill moss, but safe when used correctly. We also rinse down plants and cover sensitive landscaping to protect your yard.

2. “If the moss comes back, the treatment didn’t work.”

Moss can grow back eventually—especially in shaded or damp areas. But that doesn’t mean the cleaning failed. That’s why we offer a 2-year moss-free warranty at Top Dawg. If regrowth happens, we’ll treat it again—no charge.

3. “My roof looks clean, so I don’t need to wash it.”

Visual inspection can be misleading. Moss and algae often start in hidden areas like under debris or near flashing. By the time it’s visible, damage may already be happening.

Why Roof Cleaning Helps Asphalt Shingles Last Longer

Here’s what proper soft washing actually does for your roof:

Prevents moisture damage: Moss traps water, leading to rot and leaks
Preserves shingles: Cleaning removes buildup that weakens materials over time
Reduces energy bills: Algae streaks retain heat—clean roofs reflect it
Boosts curb appeal: A clean roof can make your whole home look newer

And yes—routine roof maintenance can delay costly replacements by years.

Should You Try Cleaning Your Roof Yourself?

We understand the temptation, but roof cleaning is one task best left to professionals, and here’s why:

Falls are one of the leading causes of serious home injuries
Using the wrong method can permanently damage your shingles
DIY attempts often fail to kill moss at the root
Without proper gear and training, it’s just not worth the risk

At Top Dawg Pressure Wash, we’re fully insured, certified, and trained to protect your roof—and your safety.

FAQs

How often should I clean my roof?

Every 1–3 years depending on shade, moisture, and moss growth patterns.

Can I just use a hose and soap?

Not really. That might rinse off dirt, but it won’t kill moss. Soft washing uses specific chemistry designed to reach the root.

Will it hurt my garden?

No. We take precautions to protect plants and landscaping. That includes pre-wetting, post-rinsing, and covering delicate areas.

Is your work insured and guaranteed?

Absolutely. Top Dawg Pressure Wash is fully insured, and our soft wash roof cleaning comes with a 2-year moss-free guarantee.

Final Thoughts

So—will roof cleaning damage your roof?
Only if you use the wrong method or hire someone who doesn’t know what they’re doing.

When done properly, soft washing is one of the best things you can do to protect and extend the life of your asphalt shingle roof. It’s safe, effective, and backed by science—not myths.

At Top Dawg Pressure Wash, we take roof care seriously. Our team is fully trained, fully insured, and committed to cleaning your roof the right way. We’ll inspect your shingles, use gentle soft washing techniques, and give you before-and-after results you can trust.

📞 Call Top Dawg Pressure Wash at (778) 539-8948 to schedule your roof inspection and cleaning today.

Your roof—and your wallet—will thank you.

Will Roof Cleaning Damage or Protect Your Roof?

Will Roof Cleaning Damage or Protect Your Roof?

Why the Confusion? Blame Pressure Washing