The scheme comprises two new extensions and the redevelopment of an existing listed building in a highly sensitive conservation location. Fassaden+Architektur+Technik have been involved from the early stages to assist with the feasibility study of what is arguably one of the most challenging bespoke façade projects of 2015. Fassaden+Architektur+Technik input started with the selection of several systems as a basis and further developed several key details to support the architect's intent.

The resulting hybrid of curtain wall and rain screen strategy required a bespoke structural supporting system. Due to preservation requirements and logistical constraints, the building structure is a mixture of reinforced concrete on the ground floor, steel frame and blockwork with timber joists on the floors above.

As a response to the site constraints, our engineers developed a complex structural skeleton of cold-rolled and hot-rolled steel sections and lightweight aluminium bracketry. A series of bespoke solutions were introduced to make the bimetallic structure perform and avoid galvanic corrosion. The secondary structural frame was then modelled and tested within static simulation software. The range of measures was described in the details to deal with potential cold bridge issues. Thermal analysis and condensation study were carried out for the most complex assembly details to comply with BREEAM requirements.