A BONDEK II soffit may be covered with plasterboard attached in two ways:

Direct fixing to underside of slab: Strips of plastic foam, such as polystyrene, glued to the BONDEK II pans prior to concreting allow plasterboard sheets to be attached directly using self-drilling plasterboard screws (of suitable length). Strips to be 15mm thick and maximum 40mm wide and placed in the pans between the flues (see Figure 24).

Fixing to battens: Steel Ceiling Battens can be fixed directly to the underside of the slab using powder-actuated fasteners. Alternatively, plastic foam strips glued to the BONDEK II pans prior to concreting allow the use of self-drilling tapping screws (as above). The plasterboard is then fixed in the usual way to ceiling battens (see Figure 24).

With both methods, care should be taken to ensure that the soffit is sufficiently level to provide an even surface.

Suspended Ceiling

Ceilings are easily suspended from BONDEK II slabs using Ceiling Suspension Nuts, BON-NUT suspension nuts, or BONWEDGE suspension brackets which comply with the load capacity requirements of AS 2785. Threaded rods or wire hangers are then used to support the ceiling. Alternatively, hangers may be attached to eyelet pins powder driven into the underside of the slab, or to pigtail hangers inserted through pilot holes in the BONDEK II sheeting before concreting