How many flat & low-slope roofing contractors are in San Francisco?
Our directory lists 4 independently verified flat & low-slope roofing contractors serving San Francisco, California, ranked by experience, certifications and reputation. Apollo Roofing Company is ranked #1.
How do I choose a flat & low-slope roofer in San Francisco?
Confirm licensing and insurance for California, ask for flat & low-slope project references in San Francisco, get multiple written quotes, and check each contractor's BBB standing. Every company listed here has been independently researched.
Do flat roofs in San Francisco need to meet Title 24 cool-roof requirements?
Yes. California's Title 24 Building Energy Code requires most re-roofed low-slope (flat) surfaces in San Francisco to use Cool Roof Rating Council (CRRC)-rated products meeting minimum solar reflectance and thermal emittance thresholds. This requirement applies to both residential and nonresidential buildings and typically directs owners toward white or light-colored TPO membranes. Your contractor must document compliance and include it in the DBI permit submittal.
How does San Francisco's fog and salt air affect flat roof membrane choice?
Chronic coastal moisture and salt-laden air accelerate corrosion of exposed metal fasteners and edge details, degrade adhesive bonds in glued membrane systems, and promote moss or algae growth on membrane surfaces. Heat-welded TPO and EPDM with properly specified stainless or galvanized hardware outperform adhesively seamed systems in these conditions. Proper drainage slope—at minimum 1/4 inch per foot—is also critical: ponding water in San Francisco's cool temperatures is slow to evaporate and accelerates membrane fatigue.
What permits are required to replace a flat roof in San Francisco?
Most flat-roof replacements in San Francisco require a building permit through the Department of Building Inspection (SF DBI), with plan check review if structural or insulation changes are involved. A licensed California C-39 roofing contractor must pull the permit. Title 24 energy compliance documentation is required for any re-roof on low-slope surfaces, and a final inspection sign-off is mandatory before the work is considered complete.