How it is worked out
Wall area is each room's perimeter times its height, less about 1.9 m² for each door and 1.5 m² for each window. Ceiling area is length times width. The calculator adds your waste allowance and divides by the area of one sheet.
How our plastering takeoff service works →Common questions
Which sheet size should I use?
Use the longest sheet that covers the wall in one piece and that you can carry into the room. Fewer joins means less taping and sanding.
Can you work out the board order from my plans?
Yes. Send the PDF plans and Sigma Build measures every wall and ceiling, separates wet areas and fire-rated walls, and works out the board order and a quote at your rates.