225 Marsh Wall is a 56 floor residential tower located on the Isle of Dogs, East London. The Ground Floor and Levels 1 and 2 will feature commercial space. There will also be a 2 storey basement below the tower’s footprint. Walsh has been commissioned to provide the required engineering support to take the project from planning through to delivery. With our high rise expertise and close interfaces with wind tunnel analysis providers, we have been able to reduce the concrete in the stability system by approximately 20%. Our engineers have also reworked the grid and proposed a low density 200mm thick reinforced concrete slab. Further foundation optimisation has also been achieved by utilising a piled raft solution that reduces the piling requirement by approximately 25%. We are also working closely with the frame contractors to specify a high modulus, low cement mix. This will create a target cement replacement figure of 80% in the substructure and 50% in the superstructure. The structure consists of Reinforced Concrete (RC) slabs and columns, with a central RC core providing lateral stability.