South Napa Earthquake Recovery Advisory: Earthquake Strengthening of Cripple Walls in Wood-Frame Dwellings, Second Edition [open pdf - 2MB]
From the Purpose: "The August 24, 2014 South Napa earthquake (FEMA DR‐4193) has reinforced past observations that wood‐ frame dwellings with flexible wood foundation walls (known as cripple walls) and inadequate anchorage (bolting) to the foundation are vulnerable to damage from earthquake shaking. [...] This Recovery Advisory Addresses:  Installation of pre‐engineered plywood bracing and foundation anchorage details intended to improve the performance of cripple walls in wood‐frame dwellings in future earthquakes.  Information on how and when to use the FEMA Plan Set, and when to engage the services of a design professional."
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