Timber and concrete upper floors

Also see:

6.4.16Joists and openings

Upper floors shall have adequately sized and properly supported trimmer joists around openings.

Trimmed and trimming joists should be:

  • detailed in the design
  • designed in accordance with Technical Requirement R5.

Connections between joists should be made with suitable ‘timber-to-timber’ hangers, and:

  • where face fixing I-joists to another I-joist, be provided with backer blocks on both sides of the web of the trimmer
  • where metal web joists are used as a trimming joist to support another metal web joist, have timber uprights between the flanges of the trimmer.