Very few drawings of the original buildings were available. The lack of original design information also made it difficult to determine the position of the existing structure.
Preliminary surveys carried out by the architect identified that the buildings were not plumb.
There were no existing gridlines or datums set. The condition of the existing slab was poor.
The fast track timeline on the project meant that cladding installation had to follow directly behind the demolition of the existing façade.
A2O appointed a local building survey company to carry a point cloud survey of the existing towers. This survey was used to create new gridlines and datums for the existing structure.
The position of the SFS for the external walls was carefully determined, given that the buildings were neither square nor plumb. A2O’s engineer designed bespoke SFS base and head details to accommodate a non-standard cantilever and, in some areas, a poor slab edge finish.
Installation was carried out ‘top down’, working two floors away from the demolition contractor. The project was carefully managed to stay on programme as well as ensuring a safe install.