Five things to check this weekend
- Gutters. Lots of shingle granules in the downspouts mean the shingles are wearing out.
- Shaded slopes. Moss that lifts shingle edges lets wind-driven rain underneath.
- Ridge and valleys. Cracked ridge caps and debris-filled valleys are where leaks start.
- Attic. Look for daylight, damp sheathing or stains around vents and chimneys after rain.
- Low-slope sections. Water that stays for days, or bubbles in the membrane, means trouble.
What's typical by neighborhood?
Peninsula roofers commonly see moss and curling shingles on fog-belt homes in Daly City and Pacifica, ponding and split membranes on low-slope mid-century roofs, worn shingles on 1950s and 60s tracts, and tree damage on foothill lots in Belmont, San Carlos, Hillsborough and Woodside.
When should I get a professional opinion?
Before you list the house, when an insurer asks about the roof, or right after a storm leak. A written assessment with photos helps with all three.
Every roofer we work with is licensed, insured and highly reviewed by Bay Area homeowners.
Get a free replacement quoteFrequently asked questions
Are granules in my gutter a problem?
Some loss is normal on a new roof. Heavy loss on an older roof means the shingles are near the end of their life.
Is moss a reason to replace the roof?
Not by itself. If moss has lifted or cracked shingles across large areas, replacement is often the better fix.
Should I get a roof assessment before selling?
It helps. Buyers' inspectors will look at the roof, and a recent written assessment answers questions early.
Sources
Sources reviewed November 11, 2026. Figures are published estimates and official fees, not quotes. Confirm prices, permits and requirements with your contractor and building department. This page is general information, not legal or insurance advice.