Clayton's Seismic Design Category, explained

USGS's ASCE 7-16 seismic design model - the same standard building codes use - places Clayton in Seismic Design Category B: Low seismic hazard. Code requires basic seismic detailing (bracing, connections) but no special structural system restrictions. Rank it against the rest of the country and Clayton sits at the 33th percentile for seismic hazard among 4,875 US cities.

Where Clayton sits in North Carolina

The raw figures: peak ground acceleration 0.055g, short-period spectral response 0.116g, 1-second spectral response 0.059g. Among 147 North Carolina cities in this dataset, Clayton ranks 120 for seismic hazard, the 18th percentile within the state. About 31,732 people live in Clayton, North Carolina.

Bracing and bolting: the actual cost

Outside California, no state-level retrofit grant equivalent to Brace + Bolt could be found for North Carolina. A typical retrofit still runs $5,000-$10,000 nationally, about $7,000 for a common single-family job.

What this means for insurance

Outside California, earthquake coverage is typically sold as an endorsement added to a standard homeowners policy, not a separate product - worth asking about directly when getting a home-insurance quote for a Clayton address.

More on how this number was built

The methodology guide covers exactly how USGS's public design-maps API produced Clayton's numbers. The guide to what a Seismic Design Category actually means covers why a category is never a substitute for an engineer's assessment of one specific house.