Signs Your Marin or Sonoma Roof Needs Replacement

Marin and Sonoma roofs telegraph end-of-life on a different timetable than inland-California averages because of three local factors: persistent fog in West Marin and coastal Sonoma (moss and lichen accelerate weathering), high UV on inland south-facing slopes, and the disproportionate share of homes built between 1955 and 1985 that have aged-out underlayment regardless of the surface shingle's apparent condition. Pay special attention if any of the following is true: the roof is older than 20 years, you've never had a documented inspection, your home is in a WUI fire zone, your insurer has sent a renewal notice asking about roof age, or you're planning to list within 18 months.

The eight signs we look for, in order of urgency: 1. Light through the roof deck. Stand in the attic with the lights off at midday. Any visible daylight through the sheathing means active water entry waiting for the next rain. Replace within weeks, not months. 2. Active drips during rain. Self-explanatory. Most homeowners try to source the leak from inside — the actual entry is usually upslope by 4–8 feet, hidden by underlayment. Get a documented inspection while it's still wet. 3. Visible deck sag or sponginess walking the roof. Structural. Stop walking on it and call. 4. Repeated leaks after spot repair. Two repairs in the same area in two years = the system has failed. The third repair will not be the last. 5. Widespread granule loss on multiple slopes. Granules in the gutter and bare spots you can see from the street. The shingle is at end-of-life — the underlayment is usually right behind. 6. Curling, cupping, or buckling shingles. Caused by under-ventilated attic, age, or both. Adjacent slopes are aging at the same rate. 7. Missing, lifted, or rust-streaked step flashing at chimneys, walls, skylights. Step flashing fails before shingles. If yours is visibly compromised, the underlying water entry is older than the visible stain. 8. Moisture in the attic. Damp insulation, blackened sheathing, or visible mold. Even without a ceiling stain yet, the roof is letting water through. See attic ventilation — sometimes the issue is ventilation, not the surface. A real inspection distinguishes the two. Bonus 9th sign: Granule wash deposit on the patio under downspout outlets. If the patio has a colored stripe where the downspout discharges, that's months or years of accumulated granule loss.

Northern Pacific's inspection produces a written report and 8–12 photos documenting whichever of these eight signs we found and whichever we ruled out. We tell you the timeline honestly: "weeks," "this season," "1–3 years plan for it," or "still has 5–10 years of life — re-inspect in 3." We're GAF Master Elite and Malarkey Emerald Certified, so when replacement is the call, we install systems backed by the strongest manufacturer warranties in residential roofing — both 25 years, both transferable. We add ice & water shield in valleys and at penetrations as a default, not an upgrade. CA Lic. #812250. If a competing inspector says your roof is fine and our inspection finds problems, we'll show you photos and the math. If a competing inspector says your roof is failing and ours says you have 5 years left, we'll show you the photos for that too. The work product is documented either way.

If you've spotted one or two of these signs from the ground, the responsible next step is a documented inspection — not a sales pitch. We charge nothing for the inspection and walk you through what we found in plain English. Book a free inspection Call (415) 456-3482 If the answer is clearly replacement, see Roof Replacement Cost and Repair vs Replace.