If you’ve ever noticed strange patches or dark streaks on your roof, you’re not alone. In Southern California’s climate, it’s not uncommon for homeowners to deal with mold or mildew, two forms of fungal growth that can affect your roof’s appearance, performance, and lifespan. While they might look similar at first, knowing which one you’re dealing with can make all the difference when it comes to maintenance and long-term protection.
At Chandler’s Roofing, we’ve seen it all, from surface-level mildew to deep-set mold that’s damaged roof decking. Here’s what you need to know about spotting the difference and what to do if you find either one.
Mildew: The Lightweight Surface Trouble
Mildew tends to stay on the surface of your roofing materials. It usually shows up as a thin, powdery film in lighter colors, think white, yellow, or gray. It often forms in shaded, damp areas like roof valleys or under overhanging trees, where airflow is restricted and moisture tends to linger.
While mildew doesn’t usually cause major structural issues, it can leave your roof looking stained and neglected. If left untreated, it can spread and become harder to remove.
Good news: Mildew is typically easier to clean than mold and doesn’t usually cause damage beneath the surface. But that doesn’t mean you should ignore it, it’s best to deal with it early.
Mold: The Deeper, More Damaging Invader
Mold, on the other hand, is a more serious issue. It appears in darker tones, black, brown, green, or dark gray, and often has a slimy or fuzzy texture. Unlike mildew, mold can work its way beneath shingles and into the underlying materials, especially if there’s existing moisture from leaks or poor drainage.
Once mold settles in, it can lead to wood rot, attic damage, and even health issues. Mold spores can trigger allergic reactions, especially for those with respiratory conditions.
In short: Mold isn’t just an eyesore, it’s a warning sign that your roof may be compromised.
What to Do If You See Mold or Mildew on Your Roof
If you spot discoloration or growth on your shingles, don’t wait. The earlier you take action, the better your chances of avoiding expensive repairs. While some homeowners try DIY cleaning methods, we strongly recommend calling a licensed roofing professional, especially for mold.
At Chandler’s Roofing, our team will:
• Inspect your roof to identify the type of growth
• Check for underlying issues like leaks or poor ventilation
• Apply safe, professional-grade cleaning solutions
• Remove the growth thoroughly and safely
• Repair any damage contributing to the problem
We also take care to protect your landscaping during treatment and follow up with detailed inspections to ensure your roof is healthy moving forward.
Preventing Mold and Mildew from Returning
Prevention is key to keeping your roof in top shape. Here’s how you can reduce the risk of mold and mildew growth:
• Keep your roof clear of debris. Leaves, branches, and dirt can trap moisture and create a breeding ground for fungi.
• Improve ventilation. A well-ventilated attic prevents heat and humidity from building up. Make sure your roof has proper intake and exhaust vents.
• Fix leaks immediately. Any sign of water damage—like missing shingles or sagging areas—should be addressed right away.
• Schedule regular roof maintenance. Having your roof inspected and cleaned by professionals like Chandler’s Roofing can help catch problems before they grow.
Let Chandler’s Roofing Help
Whether you’re dealing with mildew stains or suspect mold is taking hold beneath the surface, Chandler’s Roofing is here to help. Our team of certified professionals has over 80 years of experience serving homeowners across the South Bay and Greater Los Angeles area. We’ll get your roof back in top condition and give you peace of mind that your home is protected.
Don’t wait until the problem spreads. Contact Chandler’s Roofing today for a roof inspection or mold/mildew consultation.