Exterior painting in South San Francisco

Outside paint for South San Francisco wind and damp nights

Findings adopted with the city's 2025 building code put relative humidity at about 62% by day and 86% at night, with summer winds mostly from the northwest and gusts to 23 mph, and 80% of the 18.83 inches of yearly rain falling November through April. For exterior paint that means starting after the morning damp burns off, finishing early enough for the coat to set before evening, and saving whole-house jobs for the dry months.

The 1950s were the city's busiest building decade, and about 69.8% of its 23,515 housing units predate 1980. On those houses we ask what year it was built, since federal lead rules apply to paid scraping and sanding of paint on homes from before 1978. The Building Division lists painting as finish work that needs no building permit.

Worth knowing about South San Francisco

• SFO's Noise Insulation Program has installed windows, doors and ventilation systems in eligible homes inside the 65-dB contour; a Repair or Replacement Initiative addresses earlier improvements that stopped working properly.
• Most lowland areas have liquefaction potential. Soils on unengineered fill tend to settle over time, and rapid settlement can crack foundations, sidewalks and walls.
• Flooding is confined to areas along Colma Creek, mainly where an undersized culvert under the Southern Pacific tracks backs up; most of the city is outside FEMA flood zones.