San Francisco has dozens of microclimates, and each one wears a roof down differently.
Drive from Ocean Beach to 5th Street on a summer morning and you’ll cross two different climates. The western avenues sit under fog while SoMA rooftops are already dry. That difference shows up years later, in where roofs fail first.
Roofing needs can change from one San Francisco neighborhood to the next. Explore your San Francisco neighborhood below to see the conditions, wear patterns, and roofing concerns we pay attention to.
Rows of flat and low-slope roofs line these avenues, and many stay damp for long stretches of summer. Fog drip collects in low spots, so ponding here often begins on days without a drop of rain.
Drains face a second problem. Ocean wind carries sand inland, and eucalyptus leaves and pods pile up around scuppers and drain grates. A half-blocked drain can turn a light fog into standing water.
In the Sunset and Outer Richmond, we check drain openings and roof low points before anything else. Keeping them clear often buys more roof life than any coating.
Victorian and Edwardian homes in Pacific Heights and Presidio Heights carry decorative parapets, cornices, and trim built for looks first. Much of their flashing sits behind that woodwork, hidden from the street and often from the roof itself.
When a parapet cap fails, water runs down inside the wall. Owners often call it a wall leak or a window leak and patch the wrong spot for years.
Closer to the bay, in the Marina and Cow Hollow, salt air and steady bay wind work on metal. Fasteners, flashing screws, and exposed edges corrode faster than they would farther inland. Here, we match original profiles and trim, and choose fasteners for salt exposure.
Salt air may beworking on your fasteners right now.
Rowhouses in Noe Valley and the Mission share walls, and many share light wells too. Those narrow wells funnel runoff from several roof planes into one small roof and one small drain. When that drain slows, two neighbors can end up with the same leak.
Up the slopes, the problem changes direction. In Bernal Heights, Twin Peaks, and Diamond Heights, wind funnels up the hillsides and drives rain sideways under lapped shingles and tile. A roof that sheds straight-down rain perfectly can still take on water during a windy storm.
Water follows patience. It finds the one short-nailed lap or the one light-well drain nobody cleared, and it keeps coming back. On these roofs, we check laps, edges, and shared drainage before recommending anything larger.
Our office sits at 650 5th Street, so SoMA’s flat roofs are the ones we see most. Here, the membrane is rarely the weak point. HVAC curbs, vents, pipe boots, and the seams around them are where most leaks start.
Potrero Hill and Dogpatch mix residential flats with light-industrial buildings on TPO and modified bitumen. Equipment gets removed, new units get added, and each change leaves penetrations behind. We trace every curb and seam, not just the obvious damage.
For buildings in SoMA and the Financial District, we schedule inspections and work around tenant hours, deliveries, and building access rules.
Many homes here have older roofing systems that have been patched over the decades. A cracked pipe boot, a loose flashing, or a slow gutter is minor on its own. Left together for a few rainy seasons, they can add up to decking repair.
We sort what we find into what needs attention now and what can wait. When budgets are tight, that helps owners decide what to fix first instead of facing everything at once.
Your neighborhood tells us where to start looking. Only your roof tells us what’s actually happening. If you’ve noticed ponding after fog, a stain near a parapet, or a leak you share with next door, get it checked before the rainy season starts.
