Architect and Builder June/July 2018 | Page 25

fourth floor. The ribbed finish on the sides of the concrete cylinder shaped the upward lines forming a key that ties the glass box down to the podium level. Sky Lobby The sky lobby created a break in the black box. The opening on the North East and the South West gives the impression of the opening being punched through the building even though the three levels cross through this space. The triple volume opening runs from levels 10 to 12. The 96 Rivonia Road space functions as the entertainment deck for the Werksmans staff and clients. CHALLENGES The original idea was not to have any support under the glass box but have it cantilevered over the entrance of Werksmans. This however proved to be too expensive and the concrete structure was brought in to reduce cost. A glass box will always pose a thermal comfort challenge, but it was addressed effectively and efficiently by the façade engineer, mechanical engineer and designers. 25