Plyscraper

A plyscraper is a skyscraper made (at least partly) of wood. They may alternatively be known as mass timber buildings.

The Lake Mjøsa Skyscraper in Brumunddal, Norway, is built of cross-laminated timber (CLT).

Materials

The use of cross-laminated timber (CLT), a type of mass timber, gives high fire resistance, because when exposed to fire, CLT forms a surface char layer, which protects its interior from fire damage.[1] As they are made of wood, they lock up carbon during construction, and are sustainable if the timber they are made from is replanted.[1][2]

Plyscrapers, may, besides using wood (often cross-laminated timber), also use concrete. These plyscrapers are called "hybrids".[3] Concrete may, for example, be used for making the columns. As an alternative to concrete columns, "glulam" is sometimes also used. With this type of laminated wood, the boards are not glued cross-wise, but rather glued while pointing the same direction.[4]

Tallest plyscrapers

Until 2017, the tallest habitable building made of timber was the 53-metre (174 ft) Brock Commons on the campus of the University of British Columbia near Vancouver, Canada. In 2019 the Mjösa Tower in Brumunddal, Norway, was completed, taking over the title with its 85.4 metres (280 ft).[5] Several proposals for taller timber buildings have been made, including a 350-metre (1,150 ft) tower in Tokyo.[6]

Although quite high buildings can be made using cross-laminated timber, and/or other materials, building high with current techniques does have its drawbacks. For example, walls and columns get so thick then that the size of the usable interior space gets heavily reduced. This issue does not occur with shorter buildings.[7]

See also

References
  1. "Skyscraper Dictionary » Plyscraper".
  2. "Plyscrapers". The Economist. Retrieved 20 July 2016.
  3. The rise of skyscrapers made of wood
  4. Kijk magazine, 12, 2019
  5. "The world's tallest 'plyscraper' completes in Norway". The Spaces. 2019-04-11. Retrieved 2019-10-15.
  6. Hunt, Elle (16 February 2018). "Plyscraper city: Tokyo to build 350m tower made of wood". The Guardian. Retrieved 18 February 2018.
  7. Kijk magazine, 12, 2019


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