Østensjø school is in the district of Østensjø to the north of Østensjøvannet. It consists of two older protected school buildings, and a school building that was built in 2012. The project includes two new buildings, Nordbygget and Vestbygget, and is an extension of the existing Østensjø School. Degree of Freedom was contracted for the detailed design of all load-bearing structures.
The new buildings offer classrooms, music rooms, gyms, as well as communal areas, storage areas, and technical rooms.
The building above the ground is made of massive timber elements: glulam columns and beams, and CLT walls and slabs. The timber structure adopts the platform frame typology, where the panels that form the walls support the slab panels on top of them and function as a base for the next level. Solid timber allows strict fabrication tolerances and minimizes the construction period on site. Other advantages of this type of construction are the thermal, acoustic, and moisture-regulating properties associated with timber. The elements that are in contact with the ground are reinforced concrete.
The design group worked actively with an environmental follow-up plan to ensure that the school buildings are constructed as to the Passive House standard. Other important environmental measures included greenhouse gas accounting and a fossil-free construction site.
Structural engineering during detailed design including complete BIM model and erection sequence model of the timber structure, and complete BIM model of the concrete structure including bending schedules of the reinforcement. Technical assistance during construction.