AmCal Roofing | General Contractors & Roofing in San Francisco, CA 94132

We use a professional, multi-step process. First, we safely remove existing moss without damaging your roofing materials. Then, we apply EPA-approved zinc or copper-based treatments at strategic ridge lines. These treatments wash down with rain, creating a protective zone that inhibits future moss and algae growth for years, which is crucial in our foggy climate.

Absolutely. Inadequate or compromised insulation can lead to condensation within your roof assembly, especially with the temperature swings between our cool nights and warmer days. This trapped moisture reduces insulation effectiveness (raising energy bills) and can promote mold or wood rot. We assess your attic ventilation and insulation to ensure a dry, balanced system that protects your home.

Addressing both together provides comprehensive protection. Moss can trap moisture against shingles, while poor insulation leads to interior condensation. Our combined service ensures the *entire* roof system—from the outer surface to the attic—is working to shed moisture efficiently. This holistic approach is the best defense for long-term roof health and home energy efficiency in San Francisco.