VISION Issue 31 - Page 13

13 For us it was trying to enhance the experience of visitors as they rise up through this lift and expand their perception of the landscape. Then there are the technical challenges. CECILIA WELLS, ARCHITECT What was the major reason for sourcing your glass through Viridian? We turned to Viridian for glass reliability and quality. Nickel sulphide failure is always uppermost in our minds. I'm not so sure it's such a big issue now with glass quality improving worldwide. We did look at using cheaper overseas alternatives. It became a huge challenge to test that and arrange for proven functioning assemblies, all installed on time. Viridian really had all of that expertise right here. What about solar loads? We had to develop the design specifically to suit the site and climatic considerations. There were also safety considerations about how breakable or prone to impact the glass may be. Then there are cleaning and shading aspects. The solar shading co-efficient is a very important consideration, so the frit was a very important aspect of the design to reduce the lift-car heat load. Does such an exposed site present any other challenges? A significant rooftop passive ventilation system draws in cool air from the main cultural space, as well as mechanical fans to provide back-up on very hot days. It's not air-conditioned, but the modeling shows it should perform well with the selected glazing providing a high shading co-efficient. Any other climatic issues? The prime challenge is keeping water out, so we came up with a complicated series of channels, drains, overhangs and sy