Weighing 800kg each, the 33 full-height double glazed units on the ground floor were outside of Schueco’s cleat capacity. In a first for NACWL, we overcame this by utilising load-bearing, ground-based props provided by Armatherm. Crucially, the design of the props prevents a cold bridge from being created, ensuring that the thermal properties of the panes aren’t compromised.
To create a crisp, aesthetically pleasing appearance, each corner of the ground floor facade was required to be positioned glass-to-glass, i.e. without any visible framing on the vertical edge of the corner panes of glass. To achieve the desired result, we used Sika bonding to structurally bond the un-restrained vertical edges to concealed framing profiles.
Weighing 1 tonne each, the 22 full-height double glazed units on floors 1-3 were the largest we’ve ever worked with and required us to adapt our systems accordingly. Due to the relatively lightweight construction of the building’s concrete frame and slabs, the weight of the glass created a significant risk of racking within the steel curtain wall framing. Following structural calculations and elemental analysis, our solution resulted in the installation of steel shelves beneath each cill transom connection to provide additional support for the glass load, as well as positioning packers at designated locations around the glass perimeter. The complex lifting operations were planned and executed successfully by our in-house AP and lifting teams.