ISG is undertaking extensive refurbishment of 4 North St Andrews Square in the centre of Edinburgh, known previously as Edinburgh House. The £8 million redevelopment of the eight storey building will include the addition of an extra floor at roof level, open plan floor plates and bike storage facilities. Once completed, the building will accommodate up to 500 staff and offer stunning views over the city. Aquaforce was engaged to undertake the creation of approx 10m x 3.5m penetrations through the existing 8no post tensioned floor slabs of varying thickness, 200 – 300mm to facilitate the construction of a new lift shaft in the centre of the building. To carry out the works, both handlance and robotic water jetting techniques were used. Aquaforce used its own Aquajet Aquaspine robot

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