Roofing in San Francisco, CA

Name: Mill Valley Roofing — San Francisco
Telephone: 6283135855
Price range: $$

Professional roofing services in San Francisco, CA. Licensed, insured, and locally operated.

Serving San Francisco and Surrounding Areas

Roof Problems San Francisco and Marin Homeowners Call Us About

Coastal fog and morning moisture keep roofs damp for hours after sunrise, and winter atmospheric rivers dump rain in short, heavy bursts. Add a housing stock that runs from 1890s Victorians with flat parapets to mid-century apartment buildings with low-slope decks, and you get a predictable set of failures we see on every inspection route.

Ceiling stains that spread after a storm — water is wicking past a lifted ridge cap or a rusted pipe boot, not through the shingle field. Ignoring it soaks the underlayment, reaches the roof deck, and starts rot in the plywood sheathing.
Cracked or pulled chimney flashing — masonry and metal expand at different rates, so counter-flashing separates and old caulk dries out. Rain then seeps down the chimney chase, spalls the brick, and stains the interior wall below.
Granule loss on south-facing asphalt shingle slopes — UV degrades the mat until the field course looks bare and gritty. That is end-of-life wear: tabs curl at the edges, and the next windstorm tears them loose.
Sagging rooflines and soft spots underfoot — long-term leaks decay rafters and the ridge beam while the decking settles out of plane. This one turns structural, and it usually surfaces only when someone climbs up for a gutter cleaning.
Clogged gutters and overflowing downspouts — redwood needles, not shingle grit, are the usual culprit here. Water backs up under the drip edge, peels the fascia paint, and erodes soil at the foundation line.
Poor attic ventilation — blocked soffit vents or a failed ridge vent trap warm, humid air against the underside of the deck. Condensation forms, insulation turns damp, and mold shows up before any leak does.
Ponding water on flat and low-slope rooftops — drains and scuppers clog, then the membrane sits under standing water and delaminates at the seams. Ponding water has weight, and it finds every seam that was hand-sealed years ago.