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ConstructionHow to calculate drywall quantity
The calculation is based on the surface area to cover, divided by the area of one drywall sheet, accounting for the number of layers and a cutting waste allowance. Formula: sheets needed = (area × layers × (1 + waste%)) / area of one sheet.
Standard drywall sheet sizes
- 1.2 × 2.5 m (3 m²): the most common size for walls and ceilings in residential spaces.
- 1.2 × 3.0 m (3.6 m²): used for rooms with higher ceilings, reducing horizontal joints.
- 1.2 × 2.0 m (2.4 m²): convenient for small rooms or narrow spaces.
When double-layer is needed
Double-layer drywall is used when enhanced soundproofing is needed (e.g., a wall between apartments or bedroom and living room), fire resistance (fire-rated partitions), or added structural strength (mounting heavy items on the wall).
Additional materials for installation
Besides the sheets themselves, you'll need: a metal frame (UD and CD tracks), screws to fasten the sheets to the frame (roughly 40-50 per sheet), joint compound and mesh tape for seams, and primer for finishing.
It's recommended to always buy sheets with a buffer for cutting mistakes or damage during transport and installation.
FAQ
What is the standard drywall sheet size?
The most common size is 1.2 × 2.5 m (3 m²), though other sizes exist, such as 1.2 × 3 m.
When is double-layer drywall needed?
Double layering is used to improve soundproofing, fire resistance, or structural strength — typical for interior partitions with elevated requirements.
How many fasteners are needed per sheet?
Roughly 40-50 screws per standard-size sheet, depending on the framing spacing (typically 40-60 cm).