Schöck meets high load cantilever walkway challenge

Kidwells Estate at Maidenhead, in Berkshire, is undergoing major regeneration involving seven new blocks, which are part timber clad and vary from three to six storeys of structural concrete frame.  Long cantilever walkways service multiple flats and the unusual design demands of these walkways presented a technical challenge for Schöck, who supplied the structural thermal breaks.

Now known as Parklands, this landmark £27.1 million project is a scheme for One Housing and replaces seven 1960s built apartment blocks. In all the redevelopment will provide 204 mixed tenure high quality homes.

Schöck faced an unusual technical challenge concerning the cantilever walkways as the design required as much natural light as possible in the areas around the walkways.  To meet this demand, extensive light wells are introduced at regular intervals along the length of the galleries – effectively a series of elongated spaces, separating the walkways from the building for large sections. So there are far fewer structural connection points between the walkways and the building than would normally be anticipated.

The walkways are cantilever concrete construction into internal reinforced concrete frame; and because of the restricted connectivity point opportunities, the Schöck structural thermal breaks had to resist a much greater shear load than would be the case with a more conventional design.

Schöck resolved the various performance issues by designing in its type HPC Isokorb.  It is a product utilised only if horizontal, tension and compression forces are present in the design – and it is necessary to integrate the type QP90+QP90 Isokorb as well, for linear or point connection to support high shear loads.

The result was a completely secure thermally insulated load-bearing connection at all the restricted, but key structural points.

The Schöck Isokorb range provides BBA Certification, LABC Registration and meets full compliance with the relevant UK building regulations. The requirement described in BRE IP1/06 – a document cited in Building Regulations Approved Documents Part L1 and L2 and Section 6 in Scotland – that the temperature factor used to indicate condensation risk (fRSI) must be greater than, or equal to, 0.75 for residential buildings, is easily met by incorporating the Schöck Isokorb.