Maintaining your roof isn’t just about preventing damage—it’s also about extending its life and preserving your home’s curb appeal. For homeowners in Raleigh, NC, where heat, humidity, and seasonal storms can all take a toll, cleaning your asphalt shingles is an important part of roof care. Done properly, it can prevent issues like moss, algae, and staining without damaging the shingles themselves.
While asphalt shingles are durable and popular across the region, they require periodic cleaning to stay in peak condition. But before grabbing a pressure washer, it’s important to understand the safest and most effective way to handle the task.
Why Clean Asphalt Shingles?
Over time, shingles can accumulate algae, moss, lichen, and dirt. These organic materials not only make your roof look older but can also damage the shingles if left unchecked. Moss and algae, in particular, retain moisture, which can degrade the surface of the shingles and shorten their lifespan.
Black streaks often seen on asphalt roofs are typically caused by algae called Gloeocapsa magma. This isn’t just a cosmetic issue—it can eventually contribute to decay if allowed to spread.
Safety First: Preparing for the Job
Cleaning a roof can be dangerous if you’re not properly equipped or experienced. Always prioritize safety. If your roof is steep or you’re not confident walking on it, consider hiring a professional.
Use a sturdy ladder, wear slip-resistant shoes, and never clean a wet or rainy roof. Ideally, work with someone who can spot you or assist in case of an emergency.
Choose the Right Cleaning Solution
Avoid using harsh chemicals like bleach in high concentrations or acidic cleaners, which can damage shingles, landscaping, and runoff systems. Instead, opt for a 50/50 solution of water and household bleach or specialized roof cleaners available at hardware stores.
Apply the solution gently using a garden sprayer—never a pressure washer. High-pressure washing can lift granules off shingles and drastically reduce their effectiveness and life span.
Apply and Rinse Correctly
Spray the solution evenly across affected areas and allow it to sit for about 15–20 minutes. Don’t let it dry completely, as this can make rinsing more difficult. Gently rinse with a garden hose starting from the top of the roof and working your way down to prevent water from getting under the shingles.
Avoid scrubbing, as asphalt shingles are covered in protective granules that can be easily dislodged.
Post-Cleaning Maintenance
Once clean, consider installing zinc or copper strips along the ridge of your roof. When it rains, these metals will naturally inhibit algae and moss growth. Keeping your gutters clear and trimming overhanging tree branches will also reduce moisture retention and organic buildup on your shingles.
Regular inspections—especially after storms—can help identify problem areas early. If you notice curling, missing granules, or loose shingles, contact a local expert like Rhino Roofing to assess whether a simple repair or full replacement is needed.
When to Call the Professionals
If your roof has significant moss growth, persistent staining, or is steep or multi-leveled, calling in a professional roofing company can save you time and ensure the job is done safely and thoroughly.
Professionals have access to industry-grade cleaners and the right tools to remove organic material without compromising your roof’s integrity. They can also assess your roof’s condition during the cleaning process and recommend any needed repairs.
Trusted Roofing Brands Make a Difference
When you work with contractors who use high-quality products from brands like CertainTeed, GAF, and Owens Corning, you’re also investing in roofing systems designed to resist algae and moisture. These brands offer shingles with built-in protection that can reduce the need for frequent cleanings and extend the life of your roof.
Keeping your asphalt roof clean isn’t just about appearance—it’s an important part of preventative maintenance. With the right approach, you can help protect your investment and keep your home looking its best for years to come.
Read also our blog: Questions You Need to Ask Before Hiring a Roofing Contractor
