7 Step Roof Cleaning Guide for Your Roof (Shingles, Shakes, & More)

Regular roof cleaning is one of the most important maintenance tasks homeowners can do to protect their property. From improving curb appeal to preventing long-term damage, keeping your roof clean ensures it looks great and lasts longer—whether it’s asphalt shingles, cedar shakes, or tile.

• Prevents moss and algae growth: Routine cleaning keeps biological buildup from damaging your roofing materials.
• Protects long-term value: Clean roofs last longer and help prevent premature repairs or replacements.
• Enhances appearance: A well-maintained roof makes your whole home look better from the street.

In this guide, we’ll walk you through a 7-step process for safely and effectively cleaning your roof, no matter what material you have.

❗️ Why Roof Cleaning Is So Important

Roof Longevity Depends on Maintenance

Neglecting your roof might seem harmless in the short term, but over time, debris buildup and biological growth can accelerate wear and shorten your roof’s lifespan. This is especially true for cedar shake and asphalt shingle roofs, which are both porous and vulnerable to mold and moisture retention.

Algae, Moss, and Lichen Are More Than Just Ugly

Dark streaks and green patches aren’t just cosmetic—they signal the presence of organisms that retain moisture and eat away at roofing materials. Left untreated, this buildup can cause cracks, wood rot, and even leaks.

Proper Cleaning Protects Your Investment

Replacing a roof is a major expense. Regular cleaning, when done correctly, can help homeowners delay that cost by several years while also avoiding issues with home insurance claims caused by visible roof neglect.

📞 Should You Clean the Roof Yourself or Call a Pro?

When DIY Roof Cleaning Is Feasible

If your roof has a gentle pitch, minimal buildup, and safe access, a confident homeowner might tackle the job with the right tools and protective gear. This is often the case for small sections of low-slope asphalt shingle roofs.

• Safety first: Always use a safety harness and stable ladder.
• Use the right cleaners: Not all materials respond well to generic pressure washers or store-bought cleaners.

When to Hire a Professional Roof Cleaner

Most homeowners should leave full roof cleaning jobs to trained professionals. This is especially true for cedar shake or steep-slope roofs, which require specialized techniques and materials.

• Material sensitivity: Cedar shakes, slate, and tile can be damaged by harsh tools or chemicals.
• Safety concerns: Steep or slippery roofs pose real fall risks without proper training and equipment.

✅ 7 Step Roof Cleaning Guide for Your Roof

1. Inspect the Roof for Damage First: Before any cleaning begins , walk the perimeter of your home or check from a ladder to inspect for loose shingles, cracked shakes, or soft spots. Cleaning over damaged areas can make problems worse.
2. Clear Debris by Hand or Blower: Use a leaf blower or a soft broom to remove twigs, leaves, and dirt. Clearing the surface helps cleaning solutions reach problem areas more effectively.
3. Protect Landscaping and Gutters: Cover shrubs, flowerbeds, and nearby surfaces with tarps or plastic sheets. This prevents chemical runoff from damaging your plants or staining your siding.
4. Choose the Right Cleaning Solution: For algae or mold, use a cleaning solution approved for your roofing material. Oxygen-based cleaners work well for shingles, while cedar roofs may need special wood-safe solutions.
5. Apply the Cleaner Safely: Use a garden sprayer to apply the solution starting from the bottom and working upward. This prevents streaking and allows even soaking. Avoid power washers, which can erode shingles or damage cedar fibers.
6. Let the Cleaner Soak, Then Rinse Gently: Allow the product to sit for the manufacturer’s recommended amount of time—usually 15–30 minutes—before rinsing it off gently with a garden hose.
7. Spot Treat and Rinse Again: Reapply cleaner to stubborn spots if needed. Once the entire roof is rinsed clean, double check for debris caught in valleys or behind chimneys.

🪵 Different Roof Materials Require Different Cleaning Techniques

Cleaning Asphalt Shingle Roofs

Asphalt shingles are common but easily damaged if handled too aggressively. Algae, moss, and dirt tend to cling to the textured surface, especially in shaded areas.

• Cleaning method: Low-pressure rinse and gentle scrub with a soft brush or sponge.
• Best cleaner: Oxygen-based or biodegradable cleaning solutions.
• Maintenance tip: Install zinc or copper strips at the roof ridge to help prevent future algae growth.

Cleaning Cedar Shake Roofs

Cedar is a natural wood material that breathes, absorbs moisture, and weathers over time. It’s especially vulnerable to mold, mildew, and UV degradation if not cleaned regularly.

• Cleaning method: Hand-brushing and wood-safe cleaners that don’t strip natural oils.
• Best cleaner: Non-bleach, biodegradable cedar cleaners or professional restoration formulas.
• Maintenance tip: Treat with a breathable wood preservative after cleaning to prolong lifespan.

Cleaning Tile, Slate, and Metal Roofs

These materials are often more durable, but still require care during cleaning. Improper pressure or acidic cleaners can crack tiles or corrode metal finishes.

• Cleaning method: Soft washing with eco-safe solutions and gentle rinse.
• Best cleaner: pH-neutral solutions designed for the specific material.
• Maintenance tip: Check for loose or cracked tiles during each cleaning cycle.

❌ Common Mistakes to Avoid

Using High-Pressure Washers

While it might seem like an efficient tool, pressure washers can dislodge granules from asphalt shingles, shred cedar fibers, or break tiles. Always opt for low-pressure or soft-washing methods.

Skipping Safety Gear

Falls from roofs account for thousands of ER visits every year. Always use proper harnesses, non-slip shoes, and spotters. Or better yet—call in the pros.

Applying the Wrong Cleaners

Not all roof materials respond well to generic cleaners or bleach solutions. Using the wrong product can discolor or degrade the roofing surface. Check the label or manufacturer recommendations before applying anything.

Neglecting Regular Maintenance

Waiting until your roof is visibly green or black can mean the damage is already underway. Roof cleaning should be part of your annual home maintenance checklist to prevent buildup in the first place.

⏰ How Often Should You Clean Your Roof?

Climate and Tree Coverage Matter

Homes in humid climates or heavily wooded areas may need roof cleaning every 1–2 years. In drier regions, once every 3–5 years may be sufficient.

Signs It’s Time for a Cleaning

• Black streaks or green patches on shingles or shakes
• Increased moss growth near roof edges or valleys
• Debris collecting in roof valleys or gutters

Pair Cleaning with Routine Inspections

Scheduling a cleaning? That’s the perfect time to also have a roofing professional inspect for early signs of damage, wear, or needed repairs.

🤔 Can Roof Cleaning Extend Your Roof’s Life?

Absolutely. Regular cleaning can add years to your roof’s life, especially with more delicate materials like cedar shakes or older shingles.

• Algae removal: Prevents moisture retention and granule loss on asphalt shingles.
• Mold prevention: Reduces wood rot risk on cedar and wood shake roofs.
• Aesthetic improvement: Keeps the roof looking newer for longer, boosting curb appeal and resale value.

⭐️ Clean Roof, Protected Home

A clean roof isn’t just about looks—it’s about protecting your biggest investment from damage, decay, and costly repairs. Whether you have asphalt shingles, cedar shakes, tile, or slate, following a smart roof cleaning routine can extend the life of your roof and keep your home looking its best.

Request your free roof inspection today, and let Shake Guys help you protect, preserve, and beautify your roof—one clean panel at a time.