The worst part of an earthquake for the home is the sudden jolt that knocks the house right off the foundation. Wood structures are designed to be forgiving to to some seismic activity, but even a moderate earthquake can destroy the structural integrity of a home.
Simpson Strong Tie makes all types of hardware that keeps homes intact in high winds, snow loads and earthquakes. Their testing lab involves a large hydraulic platform that simulates seismic shocks from the foundation up. Although a home can generally withstand the intial hit of an earthquake, their testing lab shows that aftershocks can cause the walls to sheer off the foundation, even when bolted.
How do I save my home?
- Assess the foundation bolts, straps and anchors in the crawlspace
- Ensure exterior walls and garage openings are treated with sheer bracing
- Install straps that span floors vertically
- Roof structure should be clipped to the top plate in the attic
- Interior walls and floors designed as sheer diaphragms and drag struts to resist lateral motion
Studies have proven it much less costly to retrofit than rebuild.