On 19 July 2014 – to mark the start of the Centenary of the First World War – a transformed IWM London re-opened with ground-breaking new First World War Galleries and a dramatic new atrium.

Floating steel staircases, a corridor structure, infill floor structures (to match and extend the existing floors) and two new lift structures with a triangular truss link bridge to the high level flying steel completes this 370 tonne of new structural steelwork.

Twenty tapered vierendeel columns connect back to the existing steel frame, and support a high level flying steel exhibition gallery consisting of trusses and floor beams. Above which sits the magnificent retained barrel vault steel roof structure.

Due to the tight confines of the Atrium area, the steel construction process had to be coordinated with numerous other trades to enable the final structure to come together.