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Building with CLT massive wood

Wood is the construction material of the future as growing social awareness of resource conservation and simultaneous technical developments are bringing mankind’s oldest building material back into the spotlight. Through the intensified use of wood, “new forests” are emerging in our cities and towns, providing a substantial store of carbon which eases the burden on the environment. Building with CLT makes an important contribution to protecting the climate and the environment. 

Wood reduces CO2 emissions

Widely available everywhere, wood is a natural and sustainable raw material which grows back faster than it is used up. During its growth, a tree absorbs carbon dioxide from the atmosphere and a building constructed with  wood stores carbon for centuries. At the same time, with the help of solar energy and photosynthesis, new trees grow back and absorb more carbon. 1 m³ of wood stores approx. one ton of CO2, thus the use of wood plays an active role in reducing the greenhouse effect. A timber house which is disassembled after centuries of use does not leave behind worthless rubbish, but rather utilisable wood. Individual elements can be reused, while scrap wood can be used as a source of energy. CLT by Stora Enso is made from PEFC-certified softwood derived from sustainably managed forests and controlled sources. A PEFC certificate guarantees that CLT is produced according to the highest environmental and ethical standards.

Production

CLT is a solid wood construction product consisting of at least three bonded single-layer panels arranged at right angles to each other. From five layers, CLT can also include middle layers (transverse layers) without narrow side bonding.  CLT panels are made of spruce or pinewood, consist of several layers and are available in different panel thicknesses depending on structural requirements. The layers are bonded using environmentally-friendly adhesives. CLT is an approved and tested construction product and its production process is subject to strict external tests that ensure high-quality and safe construction with CLT. Diligent production planning ensures that the raw materials for producing CLT are used in the most efficient way. With correct planning, construction and protection against adverse weather conditions and damp, CLT buildings can last for centuries.

Frequently asked questions

What can be built with CLT? 

CLT has universal applications ranging from carports, added floors and extensions, through to detached and terraced houses and even including nine-storey timber residential buildings. The product is also exceptionally well-suited to the construction of industrial buildings, supermarkets, nurseries and schools. Special buildings such as watchtowers and wind turbines have already been built and are proving successful in practice.

What is the lifetime of a house built with CLT?

With the right building physics construction methods, there is no limit to lifetime. Taking old wooden construction farmhouses as an example, it is clear that a lifetime of several hundred years is not an uncommon occurrence.

Which adhesive is used for CLT?

The surface and finger joints are bonded with a polyurethane adhesive (PUR). The narrow side is bonded with an EPI adhesive. The formaldehyde-free adhesives that we use do not pose a health hazard and the quantities are reduced as far as possible in compliance with the necessary requirements resulting in a very low proportion of glue of 1%.

Where can I purchase CLT?

CLT is used by many construction companies. Please contact your architect or local carpentry company for more information or get in touch with one of our distribution partners.

Advantages of CLT

We strongly believe that CLT is the construction material for a sustainable future. CLT offers many advantages over conventional construction materials:

  • positive CO2 balance
  • environmentally-friendly and sustainable construction method
  • CLT is lighter than concrete or brick
  • good insulating properties
  • excellent fire safety characteristics
  • short set-up time, easy to assemble and high level of prefabrication
  • excellent structural properties and dry construction method
  • earthquake-proof construction method
  • up to 10% more living space gained by using CLT
  • comfortable and healthy indoor climate

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