๐๏ธ What is Drywall Construction?
Drywall (also known as gypsum board, plasterboard, or sheetrock) is the modern standard for interior walls and ceilings. It consists of a gypsum core pressed between two layers of heavy paper, mounted on a metal or wood frame.
A typical drywall wall system consists of these components:
- Gypsum Boards โ Standard 1.2m ร 2.4m boards (also available in 2.7m and 3.0m lengths)
- Metal Studs โ Vertical C-shaped profiles spaced every 40cm or 60cm
- Tracks / Channels โ U-shaped profiles on floor and ceiling to hold the studs
- Drywall Screws โ Self-tapping screws (25mm for single layer, 35mm for double layer)
- Joint Compound and Tape โ For finishing the joints between boards
๐งฎ How to Calculate Drywall Materials
1. Calculating Gypsum Boards
Boards = (Wall Area รท Board Area) ร (1 + Waste%)
For double-sided walls (the most common), multiply by 2 since you need boards on both sides of the metal frame.
Wall area = Length ร Height. For rooms, measure each wall separately if heights vary. Subtract door openings (standard: 2.1ร0.9m = 1.89mยฒ) and windows from the total area.
2. Calculating Studs
Studs = (Wall Length รท Spacing) + 1
3. Calculating Tracks
Tracks = (Wall Length ร 2) รท Track Length
4. Calculating Screws
The number of screws depends on stud spacing and screwing pattern:
| Spacing | Screws/Board | Screws/mยฒ |
|---|---|---|
| 40 cm | 32-36 | ~12 |
| 60 cm | 28-30 | ~10 |
๐ท Step by Step: Plan Your Drywall Project
Measure All Walls
Measure length and height of each wall. Note door and window positions. Record each surface separately.
Choose Board Orientation
Boards are mounted vertically (2.4m covers floor to ceiling) or horizontally (fewer joints for long walls). Match it to your ceiling height.
Calculate Each Component
Use the formulas above for boards, studs, tracks, and screws. Add 10% waste for boards and 15% for screws.
Don't Forget Finishing Materials
Joint compound (~0.5-0.7 kg/mยฒ), paper tape (~1.2m per linear meter of joint), and corner beads for external corners.
๐ก Professional Tips for Installing Drywall
Never align joints vertically. Offset them by at least 60cm to prevent cracks. On the second layer (if double-boarding), offset the joints from the first layer.
For ceilings, install boards perpendicular to the furring channels. For walls, vertical mounting is standard when ceiling height is โค 2.4m; horizontal when walls are longer than 2.4m.
In bathrooms and kitchens, always use moisture-resistant drywall (green board). For areas behind showers or tubs, consider fiber cement boards instead of gypsum.
๐ Real-World Example
Wall area: 4.0m ร 2.5m = 10 mยฒ
Boards (double-sided): (10 รท 2.88) ร 2 ร 1.10 = 7.6 โ 8 boards
Studs (60cm): (400 รท 60) + 1 = 7.7 โ 8 studs
Tracks: (4.0 ร 2) รท 3 = 2.7 โ 3 tracks
Screws: 8 ร 30 ร 1.15 = 276 โ ~280 screws
Joint Compound: 20mยฒ ร 0.6 = 12 kg
๐งฎ Calculate Drywall Automatically
Our drywall calculator computes boards, studs, channels, screws, tape, and compound for any number of walls and ceilings.
๐ Try the Drywall Calculator โ Freeโ Frequently Asked Questions
Moisture-resistant drywall (green board) has a water-repellent core and paper. Use it in bathrooms, kitchens, and laundry rooms. Standard drywall (white) is for dry areas like bedrooms and living rooms.
Average of 28-32 screws per 1.2ร2.4m board. Place screws every 20cm on edges and every 30cm in the center (intermediate studs).
Yes, but a helper is recommended for handling full-size boards, especially on ceilings. Use a drywall lift for ceiling installation if working solo.
12.5mm is standard for walls and ceilings. Use 15mm for fire-rated walls, soundproofing, or when studs are at 60cm spacing. 9.5mm is only for curved surfaces.
Approximately 0.5-0.7 kg per mยฒ of drywall surface, including 3 coats of finishing. For a 3ร4m room (24mยฒ of walls), expect to use about 12-17 kg of compound.
