The inspection and elevation study performed on the building revealed settlement of the east exterior wall and failure of the interior columns designed to support the roof loads. Elevation losses of up to 12” were found associated with the interior columns. The east exterior wall was piered, raised back into place, and stabilized.
Our focus then turned to the interior roof columns. Piers were driven on each side of the support pad on the affected columns. Five interior columns were raised simultaneously from 4” to 10.75”.
The roof had to be monitored during the lift process to re-establish the proper grade to the roof drains.
The columns were raised independently of the floor slab. The interior floor slab was pressure grouted to fill the voids and raise it more than 12”. More than 50 cubic yards of grout was pumped under the floor slab to accomplish this step in repairs.