Wood frame, residential construction: Workers push second floor preframed dimension wood exterior wall frame up into position. Wall was framed on horizontal, either on the second floor on which workers are standing or at some other place on the site and then brought into this position by the tower crane. Workers push the 2"x4" diagonal braces to help push wall vertical, and the workers can pull on the braces to prevent the wall from overturning and falling. Once wall is in vertical position, the workers will nail the diagonal braces to the wood subfloor to hold the wall in vertical position and support it against lateral forces such as wind. Note the diagonal 1"x4" boards nailed on edge on both sides of the windows, which give the framed wall sufficient strength to resist lateral loads during construction. Ann Arbor, Michigan 2004.