A.Master carpenter Mike Shannahan, of La Porte, Texas, responds: Here’s a simple technique that will work if you can get into the wall cavity. Scab on 6-foot lengths of stud material along the bottom of each wall stud (for a single-story house, I might go with every other stud.) Make sure the bottom of the sister member sits squarely on top of the joist, and nail it off with 10 or 12 16-penny nails. (Use duplex nails if you plan to remove the scabs. In my climate, uninsulated wall cavities are common, so I just leave the 6-foot members in place permanently.) Now you can jack in the manner you described.

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