Example: a rectangular room
A rectangular room measuring 10 m by 6 m with walls 3 m high has a perimeter of 32 m. Multiply the perimeter by the wall height, then subtract the openings shown on the drawing. Calculate the ceiling separately. For several rooms, mark each partition once; adding every room perimeter can count shared walls twice.
| Calculation | Area |
|---|---|
| Gross wall area | 2 × (10 + 6) × 3 = 96 m² |
| Door opening | 2 × 2 = 4 m² |
| Window opening | 1 × 1 = 1 m² |
| Net wall area | 96 − 4 − 1 = 91 m² |
| Ceiling area, calculated separately | 10 × 6 = 60 m² |
Illustrative dimensions only. This is a calculation example, not a completed customer project or a structural design.
Why net area is not the purchase quantity
The installed area does not determine how many full panels must be ordered. Confirm the selected panel’s effective cover width, joint arrangement and available cut lengths. Nominal width and effective cover width may differ. A cutting schedule identifies full panels, cut panels and usable offcuts; do not apply an unexplained universal waste percentage.
What to send with your quotation request
- A dimensioned layout, wall heights and a separate ceiling plan.
- Door and window opening sizes and positions, checked against approved frame drawings.
- A panel schedule with material, thickness, effective width, cut length and quantity.
- A separate list of corners, junctions, trims, fasteners, sealants, doors and windows.
Before ordering
Agree how quantities will be measured and priced, whether opening deductions apply, and which accessories are included. Confirm ceiling support and attachment requirements with the responsible designer. Check the approved cutting schedule before fixing the order quantity. Transport and handling limits may affect the chosen panel lengths.