Earthquake Resistant Design: Seismic Zones

Earthquake Resistant Design: Seismic Zones Earthquake resistant design matters for any DIY homebuilder working in an active seismic region: it reduces collapse risk, limits repair costs, and can keep occupants safe. This guide explains how seismic zones change design demands, which materials and details perform best, low-cost retrofit steps you can do yourself, and when to involve an engineer. Readers will get practical data (PGA ranges, soil classes, typical retrofit costs) and step-by-step options for foundations, framing, and passive-house integration. TL;DR: - Prioritize a continuous load path and sill bolting: basic bolting and cripple-wall bracing can cut collapse risk by 50–80% and cost $300–$1,200 for a small house. - Use lightweight, ductile systems (wood or steel framing) and reduce mass; avoid unreinforced masonry or heavy veneers in high seismic zones. - Start with low-cost retrofits: water heater straps ($20–$50), chimney stabilization ($200–$800), and plywood shear panels...