Does the 2026 San Francisco Fire Code affect my siding choices in the Sunset?

Yes. As of 2026, the SFFD requires Class A fire-resistance standards for many high-density residential blocks. James Hardie fiber cement is the most popular compliant material because it is non-combustible and won't ignite when exposed to direct flame.

Why is my siding 'sweating' inside the walls during the foggy months?

This occurs in zip codes 94122 and 94121 when moisture condenses behind the siding due to temperature differentials. We prevent this by installing a high-performance Weather-Resistive Barrier (WRB) that allows vapor to escape from the inside while blocking liquid water from the fog.

Can I get a DBI permit to replace my wood siding with fiber cement in a historic district?

San Francisco's DBI and Planning Department generally support fiber cement if the profile matches the original wood. For historic districts like Noe Valley or the Haight, we provide HardiePlank textures that mimic traditional cedar to ensure permit approval.

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