1 Pancras Square (B2)

1 Pancras Square, Kings Cross, London N1C 4AG

1 Pancras Square, Kings Cross Headline Facts:

1,065 reconstructed stone and cast iron column panels covering 3,586 square meters.

Contractor : BAM

Architect : David Chipperfield

The Finer Details :

Techrete were engaged in 2012 to supply and erect the external façade of this 55,000 sq m office building. In addition to supplying the precast cladding panels, balconies and GRC soffits, Techrete were also engaged to design, coordinate and erect the cast iron columns, due to the proximity and interface with the cladding. These were manufactured by Hargreaves at their facility in Halifax, West Yorkshire and were then transported on specially adapted trailer frames and were subsequently painted and erected by Techrete.

The precast cladding and other features were to be erected outboard of the completed curtain wall cladding and this presented handling challenges and also required a bespoke fixing system. Due to its proximity to the rail lines, Techrete had to contend with a downgrading of all craneage by 25%. The windows were pre-installed and external access for this installation was via MEWPs. Above level 6 mast climbers were used.

The GRC soffits were up to 2.8m wide and specially adapted trailers, frames and lifting equipment were used to assist site handling of the panels in under-slung areas which were not accessible by the tower crane. Trial lifts were carried out at the factory, prior to delivery to site. A tower crane was used for the majority of the installation with the exception of the balconies which, due to their weight, were hoisted by a mobile crane. To ensure the uniformity of finish Techrete undertook to construct the paving and steps beneath the colonnade.

The reconstituted stone mix chosen was to complement the adjacent building B4 (Two Pancras Square) and a warm acid etched finish was used to achieve this intent.