Earthquake retrofit begins in crawl space

Tips on properly fastening cripple walls to mudsill, floor joists

Last week, a reader asked our opinion about insulating his crawl space and doing a little earthquake retrofitting under his home. We recommended that he install batt insulation between the floor joists, retrofit the cripple walls with plywood sheathing to make a shear wall, and put down a plastic vapor barrier over the dirt in the crawlspace.