Kristian Augusts gate 13

Kristian Augusts gate 13 in central Oslo (KA13) is one of the most ambitious circular construction projects in Norway by reusing about about 80% of materials. The project includes the renovation of the existing building on the site (2734 m²), an extension (855 m²), and a basement renovation (708 m²).

The project was complex to implement and required a lot of time to find materials that would not have been used otherwise. For the extension, waste materials were obtained from 25 demolition and renovation projects elsewhere in Oslo and from recycling sites, but also from surplus materials from retailers and manufacturers. In addition, units were built from recycled materials that can be dismantled later. The materials that were not used in KA13 were transferred to other projects by the project manager.

Examples of circular actions in the project:

• Windows in the extension (4^th-7^th floor) were all reused and can be dismantled and used again.

• Approximately 100 m² of parquet from scraps and order returns and around 2200 m² of carpet tiles (partially reused and partially from leftover stocks of the distributor) were reused.

• All mineral wool ceiling panels were reused (around 1500 m²).

• Around 70% of steel was reused from other local demolition/renovation projects, temporary construction activities, and private waste companies.

• The steel stairs between the 8^th and 9^th floors were reused.

• Around 340 m² of ceramic tiles (sanitary areas) came from the retailer’s stocks (wrong orders, surplus stock, discontinued products supposed to be disposed of).

• Various other elements (e.g., interior doors, stair railings, fire doors in the extension, 12 pc. of fire hose cabinets, sprinkler pipes, cooling baffles, elements of air ducts, around 58 m of cableways, sanitary equipment, radiators, and lamps) were either directly reused on-site or acquired from other demolition/renovation projects and reused in KA13; majority o these elements can be dismantled and reused again.

• The glass facade (1^st floor facing the street and backyard) was harvested from a local renovation project and the contractor’s surplus stocks; this type of facade is well-suited for disassembly and reassembly in future projects.

• The extension’s facade is made of pannel cladding from various types of reused materials (metal sheet, fibre cement board, stone composite facade panels); the way of their assembly facilitates their easy dismantling and reusing again.

• Partition walls (offices and meeting rooms; around 160 m²) were designed for easy assembly and disassembly.

• The bolt connections in the steel structure were used where possible to enable its disassembly in the future.

• 20,000 bricks were reused in the project, and lime mortar was used to make them removable, easier to clean, and potentially reusable in the future.

• Around 85 m² of granite facade stone slabs and around 100 m² of wooden limbs were repurposed for the terrace floor, which can be disassembled and reused.

  
  

Read more on https://circon.graennibyggd.is/en/examples/