What this detail covers
- Fixing an internal partition at the head where joists run perpendicular.
- Maintaining the required gap/allowance so the floor can deflect without cracking finishes.
Key steps
- Confirm whether the partition is loadbearing or non-loadbearing (this affects the head detail).
- Set the partition line and maintain the specified deflection gap (often shown as ~15mm).
- Install the head fixing as shown and to the specified schedule.
Checks
- Deflection gap is present and consistent along the run.
- Fixings do not “hard lock” the partition to the floor structure unless designed to.
Common mistakes
- Filling the deflection gap with rigid materials, causing cracks later.
- Using a generic head fixing without checking the joist direction/detail intent.
Indicative only: always follow the engineer’s fixing schedule and the project drawings.