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The timber elements only carry their own weight in the form of vertical loads that is passed over vertically from the element at the top to the element at the bottom. Steel brackets on the ground floor slab take the dead loads. The steel brackets are fixed directly to the structure of the existing slab. Therefore it was necessary to get the exact level and position of each bracket and to partially remove the existing insulation.


Additional openings for doors were cut into the existing walls. They are necessary to access newly fixed balconies on the façade facing the street on the ground and first floors. An additional opening was created in the same fa- çade in the basement in order to fulfil fire safety require- ments that demand a second exit and to allow more light to reach the basement floor. Some ground was removed in front of the basement door.


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Although vertical loads are passed through to the bottom element, it is necessary to create a horizontal fixation at each level. This is done with timber wall plates, fixed con- tinuously around the existing façade. Each timber façade element is fixed at the top and the bottom to the wall plates or the steel brackets respectively. Thus horizontal loads like wind loads are taken by each element separately only over the height of one storey.


As all new installation is attached to the outside of the existing building, it is necessary to organise the vertical distribution of installation from the outside. This is caused by the need to keep the disturbance of the building’s tenants to a minimum. Using an installation shaft, which is completely prefabricated in the workshop, solved the vertical distribution. It can be transported to site as one piece, carrying its own weight. At the height of each story the Vaillant satellite stations are visible. They are needed to separate the building installation circle and the installation circle of each level, using heat-exchanging devices.


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