Client: Ballymore/ J&C Architectural

Architect: Glenn Howells Architects

Contract Value: £1.5m

Sector: Education

Project Type: Design, supply and install



NACWL were employed to install the glazing scope to the new purpose built English National Ballet school. This scope included:

  • Steel curtain wall system – Jansen Viss 60
  • Ground floor curtain wall – Shcueco FWS 60+
  • Upper level Schueco FWS60+ screens containing AWS114 parallel opening bonded vents
  • Glazed rooflights – Schueco FWS60+ SG
  • Bespoke fabrcations such as Rainscreen panels with integrated perforated sections
  • Schueco  Glazed Doors

NACWL Proposal

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, in turn ensuring that the thermal properties of the panes aren’t compromised.

To create a crisp, aesthetically pleasing appearance, each corner of the ground floor façade 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 saw us install steel shelves beneath each cill transom connection to provide additional support for the glass load as well as the positioning of packers at designed locations around the glass perimeter. The complex lifting operations were planned and executed successfully by our in house AP and lifting teams.

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