25 Roof Leak Warning Signs (With Photos) — When to Call a Roofer for Repair

Moment #16: Moss growth patches on shingles

Moss retains moisture and can lift shingle edges over time, reducing the roof’s lifespan. It commonly appears on shaded roof areas and can spread quickly after wet seasons. Beyond the cosmetic look, moss keeps shingles damp longer, increasing the chance of granule loss and cracking. If moss is widespread, cleaning and prevention can help reduce early replacement risk and minimize leak development in affected zones.