1: Remove Old Ceiling
2: Frame up Firerated wall above Ceiling:
3: Re-Sheet Fyrcheck Plasterboard Ceiling:
4: Replace Existing Timber Beads:
5: Trowel Joins and Screw Holes.
6: Paint it and your Done.
Thats one side of the 2 adjoining units and currently we are performing the exact same steps on the otherside in unit 2.
You are required to install firewall according to Australian Safety Standards and get Council to inspect wall and sign off before you finish.