Bouverie House in Fleet street, London, is a steel framed building constructed in the style typical of the early 20th century era. In early 2008 it was noticed that the stonework on the building had begun to display various signs of deterioration reminiscent of the structural steel members making up the frame. An investigation/condition survey was carried out, and CRL were commissioned to install a Cathodic Protection System to various elevations of the building.
The building was originally clad in a variety of different materials including granite, Portland stone, glazed brick and a mixture of London brick stock. As was normal at the time the structure was built, the masonry and cladding was tightly butted against the steel frame, and the inward face of the building was encased in concrete. As a result of this form of construction of the building, and the structural steel members starting to corrode, the building began to display numerous signs of distress typical of those caused by steel framed corrosion, including cracking and displacement of the masonry and cladding.
In order to prevent further corrosion related deterioration of the façade it was decided that the most cost effective method of refurbishment was to install a corrosion prevention system and to only repair the visually noticeable areas of cracking and movement.
The only other option would have been to remove ‘all’ the cladding and brickwork, sandblast and coat the structural steel members, and then replace the cladding and brickwork. A corrosion survey and trials were first required to be carried out to determine the specific areas where cathodic protection was necessary.
If cathodic protection was a feasible option this survey would also determine the number of anodes to be installed. The trials were a success and the final design was carried out and the works put out to tender. CRL were awarded the heritage cathodic protection scheme, and after some negotiation and a decision by the Client to install the anodes from the inside of the building. The works were completed on time, to budget and to the clients satisfaction.