About this calculator
Takeoff for a brandered RhinoBoard ceiling: boards, timber branders at the right size and centres, and screws.
How it’s calculated
Branders are nailed under the trusses or joists, at 90° to them. Gyproc sets their centres by ceiling type: 400 mm for 6.4 mm M-strip ceilings, 300 mm for 6.4 mm flush plastered, 500 mm for 9.5 mm flush jointed and 400 mm for 9.5 mm flush plastered. Brander size follows the truss spacing: 38 × 38 mm up to 1,000 mm, 38 × 50 mm up to 1,200 mm and 50 × 75 mm up to 1,400 mm; beyond that, consult an engineer. Boards are 1,200 mm wide.
Worked example
With these inputs:
- Room length
- 6 m
- Room width
- 4.8 m
- Ceiling
- RhinoBoard 6.4 mm, M-strip jointed (branders at 400 mm)
- Truss or joist spacing (mm)
- 1000
- Board length
- 3,000 mm
- Waste allowance
- 5%
the result is:
- RhinoBoard sheets
- 9 sheets
- Ceiling area
- 28.8 m²
- Brander rows
- 13 at 400 mm centres
- Brandering
- 81.9 lin m
- Brander size for 1000 mm truss spacing
- 38 × 38 mm
Tips from the trade
- Level the branders from the lowest point, packing with wedges where needed.
- Fix light fittings to the branders, not to the RhinoBoard.
Results are estimates for planning and pricing. Check quantities against your drawings, the manufacturer’s data and SANS 10400 (the National Building Regulations) and your local municipality before ordering.