Cortez Roofing | Roofing Services in Covina, CA 91723

Roof valley leaks are common in our area due to high water concentration. The best fix involves a thorough inspection to locate the exact breach—often in the flashing or underlayment. We then perform a targeted repair, which may include resealing, replacing damaged flashing, or installing a new waterproof membrane. It's crucial to address these leaks promptly to prevent water from damaging your attic insulation, drywall, and structural supports.

Safely removing moss requires a gentle, non-abrasive cleaning method to avoid damaging your shingles. We use specialized low-pressure washing and manual brushing, followed by an application of a zinc or copper-based treatment. This treatment creates a protective barrier that inhibits future moss and algae growth, which is especially helpful in Covina's shaded, moist microclimates. We recommend keeping nearby tree branches trimmed to increase sunlight and airflow on your roof.

Proactive maintenance is key. We recommend bi-annual inspections, especially before and after the rainy season. We'll check for loose or damaged shingles, ensure valley flashings are secure, clear debris from gutters and roof valleys, and monitor for early signs of moss or algae. This simple routine helps catch small issues like a compromised valley seal before they turn into major leaks, saving you significant repair costs and protecting your home's value.