The vertical reinforcing was left out of a 30-foot-tall warehouse wall. The problem was not noted until the roof joists and roof decking were installed on the building. Do you know any way to reinforce a wall after it has been completed? Or does the roof joist have to be shored and the entire wall rebuilt?
It is difficult to reinforce a wall after it is built. Even if the tops of the cores are accessible, they likely are filled with mortar and debris unless kept clean during construction. Also, it is not practical to highlift a wall that is 30 feet tall and not have substantial voids. I recommend you break out the interior faces of the block at cores to be reinforced and install reinforcing from the inside. When breaking out the face shells, be careful not to damage the bed joint reinforcement. This must remain in place as it is needed to tie the wall together to control shrinkage. The reinforcing bars should be as long as possible, yet still be able to weave between the horizontal joint reinforcement typically installed at 16 inches on center vertically. The bars must be lapped and positioned in the center of the core. All mortar and debris must be removed from the cores so they are free to be grouted. The interior side of the core can be formed using a piece of plywood held in place against the wall with masonry screws. Pump a fluid grout into the core in 2-foot lifts from the bottom. When grout comes up out of a hole 2 feet above the point where it is pumped in, you know the cells have been filled with grout. This process should be repeated up the wall until the entire core is grouted. It also may be possible to install supplemental steel wind columns or masonry pilasters on the interior side of the wall so that the wall spans horizontally between the pilasters. All of these procedures should be reviewed by the structural engineer of record.