Overview of Residential Seismic Retrofit Methods

Review of videos 4-7, this video also has some brand new information on cripple wall retrofits in case you already think you know it all. This review includes a description of a cripple wall, how cripple walls collapse, why home foundation bolting alone does not provide earthquake safety, and why it is necessary to always build complete shear walls with a complete earthquake load path. Well built shear walls include house bolting, a special grade of plywood called structural 1 plywood, and shear transfer

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