25.03.2019

Locally-sourced timber tower raising the bar for sustainable construction

Kajstaden is Västerås’ new landmark nine-storey timber tower, which has reduced material emissions by 44%, and created a business model that is spreading all over Sweden.

Kajstaden, Developed by: C.F. Møller, Martinsons & Slättö Förvaltning

Västerås’ old industrial harbour is being transformed into a new neighbourhood with nature at its heart. It is therefore fitting that Sweden’s tallest wooden-framed building (as of 2018), Kajstaden, sits in the entrance to the new development.  All load-bearing elements of Kajstaden – its walls, floors, beams, and roof – are constructed from locally-sourced CLT, using 3m tall panels that reduce the need for cutting on site, and allow for all nine storeys to have high ceilings, creating spacious and light-filled living spaces. Being a project of firsts, it is also the developers first foray into wooden construction, but is now being replicated across Sweden.

Using CLT in such an innovative way did introduce some extra costs for the developers, however these costs were more than offset by the significantly shorter construction time, which reduced the need for capital and loans at the construction stage. Thanks to the use of so much locally sourced wood, Kajstaden’s material emissions are 44% lower than a concrete equivalent. Taking a full lifecycle approach, the components are designed to be reused in simpler products at the end of the building’s life before eventually being recycled for bioenergy. This long-sighted view has led to a flexible design, with the ground floor easily convertible to commercial space in the future, as needs in the neighbourhood change.

Benefits

  • innovation benifits icon: innovation benifits icon
  • innovation benifits title: ECONOMIC
  • innovation benifits text: Kajstaden has received a considerable amount of positive attention and has had a distinct effect on the market with the developers scaling to new projects around the country, proving the demand for circular bio-solutions.
  • partnership benifits icon: partnership benifits icon
  • partnership benifits title: ENVIRONMENT
  • partnership benifits text: Across the estimated 120 year lifetime of the building, the carbon footprint is calculated to be 2.2kg of CO2 equivalent per square meter – 44% less than concrete equivalent! Additionally, the biotopic roof contributes to water management in the neighbourhood.
  • economic benifits Icon: economic benifits Icon
  • economic benifits title: PARTNERSHIPS
  • economic benifits text: Kajstaden stems from a research project by the Swedish Research Council for Sustainable Development, and continues in that stead with project leaders sharing knowledge through site visits and lectures at Stockholm Architecture School.

The Nordic Wood in Construction Secretariat is hosted by EIT Climate-KIC

The project is funded by the Nordic Council of Ministers.