24 August 2020

Cross-laminated timber: structural principles WIS receives major updates

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Cross-laminated timber (CLT) is an engineered wood panel product formed by gluing layers of timber together at alternating orientations. It is known for its design flexibility and its enhanced ability to sequester carbon, as well as its ability to compete with the strength and stability of other building materials.


CLT offers opportunities to use timber in mid-rise and taller structures with wider spans where designers would traditionally have used materials such as steel, concrete and masonry by default. It can also be used with other mass timber products such as glued laminated timber or laminated veneer lumber, and in hybrid structures involving, for example, steel or concrete.


As with any relatively new structural material, it is essential that designers understand how to achieve CLT’s full potential while also respecting its limitations.


This is where TRADA resources can support you. The WIS Cross-laminated timber: structural principles has undergone a major revision, with both brand new and amended drawings, and changes made to all sections listed in the contents.


Major changes

  • Now includes eight instead of the previous six connection types
  • Shear and pull-out resistance updated to reflect latest research
  • Fire safety guidance including effect of increased fire loads and fire performance of CLT panels
  • Updates to disproportionate collapse in line with Approved Document A


Members can download a free copy of the WIS Cross-laminated timber: structural principles. WIS sheets are available to non-members too – purchase a PDF or a hardcopy at the TRADA Bookshop.