San Francisco Fire Rated Glass and Certified Partition Systems for Seismic Compliance

San Francisco's unique combination of stringent fire safety codes and high seismic risk demands fire-rated glazing systems that deliver uncompromising performance under both fire exposure and structural movement. The 2022 California Building Code (CBC), enforced locally by the San Francisco Department of Building Inspection (DBI), and SFM Title 19 require fire-resistance ratings of up to 2 hours for exit enclosures in high-rise buildings, with additional mandates for smoke control and radiant heat flux limits. For projects in this region, compliance with UL 263 (ASTM E119) and UL 10C is not optional—it is a legal prerequisite. Antifires supplies a comprehensive range of fire rated glass and partition systems specifically engineered to meet these dual demands. These assemblies incorporate intumescent interlayers and robust steel framing that maintain integrity and insulation during a fire event while accommodating the lateral drift and joint movement required by ASCE 7-16. For architects and specifiers working on San Francisco high-rises, transit hubs, or seismic retrofits, Antifires provides verified test data and localized engineering support to ensure every installation meets both fire-resistance and seismic joint protection standards. For the latest official code references, consult the California Building Standards Commission for CBC updates and the San Francisco Fire Department for Title 19 requirements.

San Francisco Building Code Fire Resistance and Seismic Joint Protection Standards

San Francisco’s 2022 CBC and SFM Title 19 mandate fire-resistance ratings up to 2 hours in high-rise exit enclosures, with additional seismic joint requirements per ASCE 7-16. Antifires’ fire rated glass assemblies meet UL 263 (ASTM E119) for structural integrity during earthquake-induced movement. The challenge in this region is that standard fire-rated glazing may fail under cyclic lateral displacement. Antifires addresses this by integrating ceramic wool (density 210 kg/m³) and intumescent fire seals (20mm × 4mm) into the perimeter framing, allowing up to 38mm of deflection without compromising the fire barrier. For podium-level retail spaces and stairwells, systems rated EI60 (60 minutes integrity and insulation) and EI120 (120 minutes) are available, with test data showing average unexposed surface temperature rises below 140°C. These assemblies use G.M.S. hollow steel sections anchored at 300–600mm intervals with M8 bolts, ensuring the glazing remains stable even when the building frame experiences seismic drift. Specifiers should note that all Antifires products for San Francisco are pre-engineered to meet the 0 ±2Pa furnace pressure conditions required by UL 263, guaranteeing reliable performance in real-world fire scenarios.

Fire Rated Glass Classification by Radiant Heat Flux and Impact Safety Ratings

For San Francisco’s mixed-use towers, select fire rated glass with CPSC 16 CFR 1201 Category II impact resistance and maximum 5.0 kW/m² radiant heat flux per NFPA 252. Our 60- and 120-minute UL 10C certified products offer 0.5-inch intumescent interlayers for life safety in stairwells and lobbies. The classification process involves two primary metrics: integrity (E) and insulation (I). For example, a 28mm EI60 panel (6mm + 5.5mm gel + 5mm + 5.5mm gel + 6mm) achieves 66 minutes integrity and 64 minutes insulation, while a 21mm FPOS assembly provides 120 minutes integrity and 30 minutes insulation. For areas where radiant heat control is critical—such as lobbies adjacent to exit corridors—Antifires offers EW120 rated systems that limit radiant heat flux to below 15 kW/m². The table below summarizes key classifications for San Francisco project types:

RatingIntegrity (min)Insulation (min)Typical Application
E9090N/AInterior partitions, vision panels
EI606664Stairwells, corridor walls
EI120120120High-rise exit enclosures, podium barriers

All products are tested per BS EN 1634-1: 2014 and ASTM E119, ensuring compliance with San Francisco’s mixed-use tower requirements.

Transit-Oriented Development and Historic Façade Retrofit Fire Glass Specifications

San Francisco’s Transbay Center and Mission Street historic renovations require fire rated glass that preserves original steel frames while achieving 1-hour ratings. Antifires’ thin-profile ceramic glazing (8mm) and fire doors meet SFO airport terminal and BART station corridor demands for smoke and flame control. For transit-oriented developments, the key challenge is integrating fire-rated glazing into existing structures without altering the architectural character. Antifires’ 8mm glass system, tested to 73 minutes integrity per BS 476 Part 22, is ideal for historic steel window frames where thicker assemblies cannot fit. For BART station corridors and SFO terminal concourses, 26mm door glass (5mm + 5.5mm gel + 5mm + 5.5mm gel + 5mm) provides 89–90 minutes integrity and 68 minutes insulation, meeting the 1-hour requirement while maintaining a slim profile. These systems use 3mm–6mm ceramic tape around the perimeter to accommodate thermal expansion without damaging the historic frame. Antifires also supplies fire rated glass for transit applications, with intumescent seals that prevent smoke migration at temperatures up to 1000°C. For Mission Street renovations, the thin-profile glazing can be installed with 12mm–15mm fire-rated insulation board behind the frame, achieving the required fire resistance without compromising the building’s historic appearance.

Antifires’ Verified UL Listing and Local Fire Stop Engineering Support in the Bay Area

Our San Francisco warehouse stocks UL listed fire rated glass, doors, and frames with 3-day lead times. We provide on-site fire stop system integration and SFM plan review assistance, backed by 15 years of California Title 24 energy code compliance for curtain wall applications. Antifires maintains a local inventory of UL 263 and UL 10C certified products, including 10mm FPOS (135 min integrity) and 50mm EI120 (120 min integrity and insulation) assemblies. Each product is supplied with a complete certified test report documenting furnace thermocouple data (9–12 Type K channels) and unexposed surface temperature monitoring (10–55 thermocouples). For San Francisco projects, Antifires engineers provide on-site support for fire stop system integration, ensuring that perimeter joints are sealed with intumescent fire seal and ceramic fiber (3mm–5mm expansion gap). This localized support includes SFM plan review assistance, helping specifiers navigate the city’s stringent approval process. Additionally, all Antifires curtain wall systems comply with California Title 24 energy efficiency standards, featuring multi-layer insulated fire-resistant glass (50mm/54mm) that meets both fire resistance and thermal performance requirements. For Bay Area architects, this means a single-source solution for fire safety, seismic compliance, and energy code adherence. Contact Antifires for a compliance quote tailored to your San Francisco high-rise or seismic retrofit project.

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Frequently Asked Questions (FAQ)

Yes, Antifires fire rated glass assemblies are engineered to meet San Francisco’s seismic drift requirements for high-rise stairwells. The systems are tested per UL 263 (ASTM E119) and incorporate 3mm–6mm ceramic wool perimeter seals that allow up to 38mm of lateral deflection without compromising the fire barrier. For stairwells requiring 2-hour ratings, the 50mm EI120 assembly (multi-layer insulated fire-resistant glass) provides 120 minutes integrity and insulation, while the steel frame is anchored with M8 bolts at 300–600mm spacing to accommodate seismic movement. These products are also compliant with ASCE 7-16 drift limits, making them suitable for San Francisco’s high seismic zone.

Antifires products carry UL 263 (ASTM E119) and UL 10C certifications for San Francisco’s 2-hour fire barrier in podium-level retail spaces. The 50mm and 54mm EI120 assemblies are specifically designed for this application, providing 120 minutes integrity and up to 120 minutes insulation. These systems use multi-layer tempered glass with intumescent interlayers, tested under furnace conditions with 0 ±2Pa pressure and Type K thermocouples across 9–12 channels. The average unexposed surface temperature rise remains below 140°C, meeting the insulation criteria per NFPA 252. Each assembly comes with a full UL listing report for plan review submission to the San Francisco Department of Building Inspection.

Yes, Antifires can provide DSA-approved fire rated windows for San Francisco public school modernization projects. The 8mm ceramic glazing system (73 minutes integrity) and 10mm FPOS (135 minutes integrity) are both tested per BS 476 Part 22 and ASTM E119, meeting DSA requirements for impact safety per CPSC 16 CFR 1201 Category II. These windows are supplied with G.M.S. hollow steel frames and intumescent fire seals, ensuring compliance with California’s school construction standards. Antifires also provides fire rated glass windows with complete documentation for DSA plan review, including certified test reports and installation specifications. Lead times for DSA projects are typically 3–5 days from the San Francisco warehouse.