A construction team working on a high rise tower will need to ensure that they have the most efficient access system available for getting personnel and materials to the work face whilst keeping the minimum opening, for access into the building. This concentration of hoisting in one area allows cladding to be installed around the open faces of the building, except the small access point to the building from the Common Tower, and then allows for the fit out of the lower floors as the main building is being constructed and grows in height. What can I tie to the Common Tower? A Construction Access Systems (CAS) Common Tower can accommodate conventional twin car single mast hoists, large single car twin mast hoists or a temporary staircase structure on any of its faces. The Common Tower is of a modular design and is capable of adaption to different sizes and shapes to suit various site conditions and to accommodate twin hoists with up to two metres width.