We constructed a system to support decorative stonework

Project: New property development in Marlborough Place, London

Robert Adam Architects was employed to design a new residential building in an area of natural beauty in St John’s Wood, London.

The development was composed of four classic Georgian style, high specification houses, featuring marble and granite stonework, hand carved oak and cast iron details.

Structural Challenges

  • One of the main challenges was how to support the large overhanging custom-cast section of Portland stone located at the roof eaves level.
  • The custom stonework protruded 1m over the modern wall structure, which was only around 100mm in width.
  • The masonry walls on the property used a conventional cavity structure, and the brick leaf lacked the strength to hold the weight of the precast Portland stone.

The design required the restraining of a large projection of heavy precast Portland stone at the top of a thin exterior wall

Our Remedial Solutions

  • To create the structural strength required to hold the Portland stone, we designed a framework consisting of fabricated steel to support the weight.
  • This innovative hybrid system used the concrete floors for support and managed to meet the requirements of the architectural design alongside bearing the load of the Portland stone.
  • Additionally, a Mansard style roof was required to hide the guttering behind the stone parapets next to the stone projection

To support the overhanging stone we designed a steel framework that dissipated the load of the stone through the reinforced floors

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