Fibonacci Square is the Ronan Group led redevelopment of the former AIB Bankcentre site in Ballsbridge, Dublin to create a major European HQ Campus. The development of the site involved the demolition of four 1970s office blocks to make way for the construction of two 6 storey office buildings, featuring a 33 metre link bridge.

The objective was to create a state-of-the-art working environment with a structure built to international sustainability standards evidenced by a LEED Gold certification.

The use of reinforced concrete with post tensioned floor slabs enabled spans of 12 metres of open plan space to be achieved, whilst reducing the slab depth and the overall weight of the building.

The facades were designed to maximise the use of natural light, whilst reducing excessive solar gain by incorporating horizontal limestone fins and glazed vertical fins. In addition, the façade arrangement provided unobstructed views of the surrounding landscape.

To further enhance the thermal performance of the facades, the design required a system of natural glazed louvres to provide both general ventilation together with emergency smoke control of the twin glazed facades.

Working closely with the façade contractor, Alucraft Ltd, a total of 502 no. FIEGER FLM SmoTec LG10 louvre windows were supplied, each comprising 10mm laminated single glazing.

All of the low level inlet vents were manufactured with a RAL 7021 Black Grey polyester powder paint finish, whilst the high level extract vents were supplied with a silver anodized finish, all to match the surrounding facade framework.

The vents were supplied complete with WindowMaster WML 860 24V DC actuators, fitted to the side-frames. This motor was selected due to its safety feature of being programmable for anti-trapping, as well as the built-in auxiliary contacts, which meant it could be easily connected to the Building Management System.

To facilitate installation into the Alucraft curtain walling system, a combination of rectangular extruded aluminium fixing adapters and angles were supplied, finished to match the louvre vents.

Developer: Ronan Group
Architects: Henry J Lyons
Consultants: CS Consulting Group
Main Contractor: John Sisk & Son Ltd
Façade Contractor: Alucraft Ltd