Section 6.4.5

Notching and Drilling

Holes created within the web of joists are a necessity to allow the passing of services and notching and drilling shall be carried out within the recognised limits. The flange of I-joist not be notched or drilled under any circumstance.

  • Hole dimensions not exceeding 20mm do not need to be to the centre of the web.

  • Minimum 2x hole dimension spacing between holes.

  • Holes larger than 20mm are required to be placed centrally within the web.

  • Holes required to be at least the distance of the joist depth away from the end or mid-support.

  • Larger holes passing through the web close to the supporting wall require additional support, Steico approval and reinforcement detail required.