Three types of curtain walling by Kawneer were chosen for the commercial element of the £200 million Atlas building in Clerkenwell in London’s architectural sector.

The traditional stick system AA110 (zone drained) was used on the ground floor, the adapted AA265 on the floors above, and standard unitised AA201 on the tenth floor return elevation to the existing building.

The adapted AA265 modular system incorporated GRC and aluminium rainscreen cladding and glazed vision areas in each panel. Some 3m wide, 3.85m high and one tonne in weight, each unit was delivered to site and hoisted into position by a tower crane, complete with the cladding and glazing in place.

Kawneer technical proposals engineer Dave Fletcher said: “The basic AA265 design was revised to accommodate the building movement that had been identified by the structural engineers as it could accommodate the size of units and the GRC rainscreen units being pre-fixed to the panels.

“The system developments, including new profile and accessory design such as 19 project-specific dies, were all carried out by our Technical Department at our Head Office.”

Installed by sub-contractor Mace Facades for main contractor Mace, the Kawneer systems also included thermally superior AA720 entrance doors on all floors.

The Atlas’ commercial element is occupied by WeWork and features a strong emphasis on nature, with three roof terraces and external green walls.