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Joint Layout

Summary

Joint Layout
Joint Layout

Joint layout is important in the design of a concrete floor. A good joint layout can minimise the risk of unwanted random cracks.

Technical Information

An ideal joint layout would: 

  • Have formed and sawn panels as square as possible, preferably with an aspect ratio of 1:1.2 or less
  • Be designed to avoid unnecessary re-entrant corners
  • Avoid creating panels with acute angles
  • Provide robust isolation details around fixed elements that may hinder the slabs ability to shrink
  • Where possible, have joints located on the column grid
  • Avoid locating joints too close to point loads or base plate fixings Limit the distance between sawn joints to around 6m.

Limit the distance between joints in formed panels to:

  • 35m in a jointless bay; and
  • 50m in a sawn bay (not applicable to long strip or wide bay construction)
  • Be fully co-ordinated with the racking / automated systems, fixtures and fittings
  • Be fully co-ordinated with the piling layout in the case of a pile supported slab

Where re-entrant corners are unavoidable, crack control reinforcement reinforcement should be used to help control the cracks that they can cause.

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