Seismic strength: On completion of the project, the building will be strengthened to above 67% NBS.
The structural strengthening programme involves:
Foundations: The existing building is shallowly founded, with beam and pad foundations. These will be augmented with additional beams and bearing pads where new concrete shear walls have been added above.
Pumice block infill walls: There has been some strengthening in the early 1990s, with sprayed concrete overlays to the western wing walls. Polyplast overlays were applied over the remaining administration cavity block walls, along with some grouted bars, tying the cavity walls together. Additional ties, and steel angle mullions, will be inserted to further strengthen these walls.