The stacked, reinforced concrete load-bearing structure in the original part of the building is technically and financially challenging to modify. Therefore, we have chosen to create only minor functional openings in the façade and remove parts of the slab between the ground and 1st floor. Most of the façade’s external cladding and insulation materials will be replaced with more energy efficient and aesthetically pleasing
materials, and a new double skin glazed façade will be added throughout the building. New features are introduced as external additions with their own load bearing steel frame structure, with floors of reinforced or pre-stressed concrete slabs.
In order to break down the massive scale of the building as well as to create an attractive entrance, we have chosen to introduce a new atrium space to the south-west part of the main façade. The transparent volume re-directs the building entrance and adds visual as well as functional diversity. A new city square is formed, where activities and exhibitions can be held. The front wall is an interactive media surface where it is possible to inform about events, monitoring of energy performance, etc.
The new, three-dimensional glazed façade is an active part of the energy optimization system, with natural ventilation to remove excess heat in summer, while forming an extra insulating layer when closed during winter months. The open stair in the new atrium is a vital part of the design. It links all floors to the entrance space and invites people to move between the floors, as there are inspiring and interesting spaces to be experienced on each floor.
In the south-east part of the block, adding the wooden structure residential block with day care facilities diversifies site utilization, and increases density. Furthermore, turning the parking space into a sheltered courtyard with city gardens adds a new, attractive living space to the area as well as increases its biodiversity.
We have also opted to create a new staircase on the courtyard side of the building, which will increase flexibility related e.g. to multi-tenant solutions. New technical spaces at the ends of each floor not only facilitate energy efficient ventilation solutions and flexible indoor climate zoning, but they also free up space on the roof to create a timber-framed Wellness centre with extraordinary views.
The implemented technical solutions will turn the Hippostalo close to plus-energy building status with an E-figure of 33.