Common Mistakes Hanging Plasterboard (UK): Sheets and Screws
A room that is boarded in a day takes careful counting first. A 4 × 3 m room with 2.4 m walls and a ceiling is 45.6 m² of board with 10% extra, or 18 sheets of 2.4 × 1.2 m, with about 570 screws. The plasterboard calculator sizes your room.
Mistake 1: leaving the ceiling out
The ceiling can double the board. For the example room:
| Area covered | Sheets | Board area |
|---|---|---|
| Walls only | 13 | 33.6 m² |
| Walls and ceiling | 18 | 45.6 m² |
Mistake 2: choosing the wrong sheet
Sheet size sets the joints and the handling:
| Sheet | Sheets needed | Screws |
|---|---|---|
| 2.4 × 1.2 m | 18 | 570 |
| 3 × 1.2 m | 14 | 554 |
| 1.8 × 0.9 m | 31 | 552 |
Mistake 3: too little extra
Cutouts for sockets, windows and doors waste board:
| Extra | Sheets |
|---|---|
| 5% | 17 |
| 10% | 18 |
| 15% | 19 |
Mistake 4: guessing the room size
Sheets of 2.4 × 1.2 m for some common rooms at 2.4 m high, with 10% extra:
| Room | Walls only | Walls and ceiling |
|---|---|---|
| 3 × 3 m | 11 | 15 |
| 4 × 3 m | 13 | 18 |
| 4 × 4 m | 15 | 21 |
| 5 × 4 m | 17 | 25 |
Measure each wall, since older rooms are rarely square, and count the board you will cut away for windows and doors only if the opening is large.
Mistake 5: poor fixing
- Fix to the studs or joists, and find them first: the stud wall calculator helps if you are building the frame.
- Stagger the joints, and keep the tapered edges together.
- Drive screws just below the surface without breaking the paper, at the spacing in the instructions.
Mistake 6: finishing in a hurry
Tape the joints and fill in thin coats, sanding between them. If you skim, prime the board with a PVA mix first, and see the plaster calculator for the amount. Estimates only.
Frequently asked questions
How many sheets of plasterboard do I need?
A 4 × 3 m room with 2.4 m walls and a ceiling takes 18 sheets of 2.4 × 1.2 m with 10% extra: 45.6 m² of board.
Which sheet size is best?
Larger sheets mean fewer joints: the same room takes 14 sheets of 3 × 1.2 m. They are heavier to carry, so allow for a helper and the stairs.
Do I board the ceiling first?
Yes, so that the wall boards support the ceiling edges. A board lifter makes the ceiling safe for one person.
Do I tape and fill or skim?
Either: tape and fill leaves a finish ready for paint, and a skim coat gives a smoother surface. See the plaster calculator for a skim.
More guides
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Estimates only. Quantities depend on your materials, site and supplier. Confirm important numbers before you order, and check the Building Regulations and any planning rules for anything structural or close to a boundary.