When to Replace Your Roof in San Francisco

San Francisco's marine climate — persistent fog, winter rain, and salt air — puts roofs under constant stress. Knowing when to repair versus replace can prevent water damage to the structure below. Here's what to watch for.

Signs your roof needs attention

• Water stains on ceilings or in the attic — a sign of active leaks.
• Missing, cracked, or curling shingles.
• Granules from asphalt shingles collecting in gutters.
• Sagging rooflines or visible dips.
• Moss and moisture buildup, common in SF's damp, shaded areas.

How long roofing materials last

Asphalt shingle roofs typically last 15–25 years, though SF's moisture can shorten that. Flat or low-slope roofs with membrane systems — common on SF homes — last 15–30 years depending on the material. Metal and tile roofs last longer but are less common in residential SF. If your roof is near the end of its expected life and showing symptoms, replacement is usually more cost-effective than repeated repairs.

Repair or replace?

Isolated damage on an otherwise healthy roof can be repaired. But widespread wear, multiple leaks, or an aging roof generally warrant full replacement — patching an old roof often just delays the inevitable while water continues to threaten the structure. A professional inspection will tell you which makes sense.

Protect your home

A failing roof puts everything beneath it at risk. If you're seeing warning signs, have it evaluated before the rainy season. We handle roofing assessments and replacements for San Francisco homeowners — reach out for an inspection and estimate.