Johnston Roofing | Roofing Services in Mount Pleasant, SC 29464

Those dark streaks are a common sight in our humid climate and are caused by Gloeocapsa magma algae. The most effective treatment is a professional soft wash with a specialized, eco-friendly cleaning solution. At Johnston Roofing, we avoid high-pressure washing, which can damage shingles. Instead, our gentle method safely eliminates the algae and includes an application to help prevent it from returning quickly, restoring your roof's appearance and protecting its lifespan.

Signs of underlayment damage aren't always obvious from the ground. After heavy rain or wind in Mount Pleasant, look for interior warning signs like water stains on ceilings or in your attic, damp insulation, or a musty smell. Externally, you might notice cracked or curled shingles, or granules in your gutters. Since underlayment is the critical water barrier beneath the shingles, we recommend a professional inspection. Our team can safely assess the underlayment's condition and recommend targeted repairs to prevent major leaks and structural issues.

Our coastal environment in Mount Pleasant presents unique challenges: high humidity promotes moss and algae growth, summer sun degrades materials faster, and seasonal storms test a roof's wind and water resistance. Proactive maintenance, like annual inspections and keeping gutters clear, addresses small issues—like a few compromised shingles or minor underlayment wear—before they become major, costly repairs. Regular care tailored to our local conditions is the most effective way to extend your roof's life and protect your home's interior from our demanding weather.