Raising an exterior wall on a second story can be awkward. Here are two tips to make this operation safer. Nail 12-in. 2x4s every 4 ft. to the outside edge of the platform where the wall is to be placed, leaving about 4 in. of this block sticking above the platform. When you raise the wall, the stops will prevent the bottom plate from sliding off the subfloor.
To eliminate frantic bracing after the wall has been raised, nail braces near the top of each end of the wall with only one nail per brace. If the wall is on an exterior corner, drive a nail into the joist or blocking about 3 ft. from the corner, as shown in the drawing. Then when the wall is raised, the brace will swing freely and come to rest on the nail, where it can be attached quickly as a temporary support.
Don Dunkley, Sacramento, CA