Cross laminated timber (CLT)

Mass timber construction / cross laminated timber (CLT) means using large-scale elements produced in solid wood.

Compared to the structural timber system, where prefabricated timber structural elements planked with panels are responsible for the load transfer, the mass timber construction uses large-size, areal elements made of cross-laminated timber (BSH, BSpH).

Mass timber construction solutions offer certain advantages:

  • The extensive elements are almost arbitrarily moldable and easily processible by industrial robots.
  • The use of solid, large-size and load-bearing plate and board elements, together with appropriate joints technology, results in a high building stiffness.
  • In comparison to lightweight construction, mass timber construction is more storage-effective and has better sound insulation.
  • Due to the simple structure, the industrial production in the factory and the areal character of the elements, both the planning and the construction are easier than with the structural timber system construction.

Conversely, solid construction has disadvantages compared to structural timber system construction:

  • Due to the separation of the insulating layer of the support structure with exterior walls, it is necessary to have much thicker walls.
  • It is mandatory to install the media (electrical, sanitary, ventilation) in the walls and floors outside of the supporting structure, which therefore means a header is required.
  • Mass timber elements are heavy and – due to the high consumption of wood – are usually not resource efficient.

Renggli also implements projects in mass timber construction. The production of mass timber elements takes place externally at specialized industrial partners.