Standard drywall sheet sizes
Gypsum board is made 4 ft (1,220 mm) wide, with a 54 in wide panel for 9 ft walls, in lengths of 8, 9, 10, 12 and 14 ft[1]. The 1/4 in board comes only in 8 and 10 ft lengths. Sheet area and approximate weight for 1/2 in regular board (1.7 lb per sq ft) are:
| Sheet | Area | Weight, 1/2 in | Weight, 5/8 in Type X |
|---|---|---|---|
| 4 ft × 8 ft | 32 sq ft | 54 lb | 70 lb |
| 4 ft × 9 ft | 36 sq ft | 61 lb | 79 lb |
| 4 ft × 10 ft | 40 sq ft | 68 lb | 88 lb |
| 4 ft × 12 ft | 48 sq ft | 82 lb | 106 lb |
| 4 ft × 14 ft | 56 sq ft | 95 lb | 123 lb |
| 54 in × 12 ft | 54 sq ft | 92 lb | 119 lb |
Weights use the handbook's approximate 1.7 lb per sq ft for 1/2 in regular board and 2.2 lb per sq ft for 5/8 in fire-rated board[1]; lightweight 1/2 in panels sold today weigh less, so check the label.
Drywall thickness for walls and ceilings
The thickness you need depends on where the board goes and how far apart the studs or joists are. IRC Table R702.3.5 sets the minimum for single-layer gypsum board fastened without adhesive[2]:
| Thickness | Use | Max framing spacing | Screw spacing |
|---|---|---|---|
| 3/8 in | Ceiling, across the joists | 16 in | 12 in |
| 3/8 in | Wall | 16 in | 16 in |
| 1/2 in | Ceiling, across the joists | 24 in | 12 in |
| 1/2 in | Wall | 24 in | 12 in (16 in at 16 in framing) |
| 5/8 in | Ceiling, across the joists | 24 in | 12 in |
| 5/8 in | Wall | 24 in | 12 in (16 in at 16 in framing) |
- 1/2 in is the standard for walls at 16 or 24 in and for ceilings at 16 in, or at 24 in hung across the joists.
- 5/8 in Type X is the fire-rated board, used where the code or a tested assembly calls for a fire-resistance rating; it also sags less on ceilings.
- 3/8 and 1/4 in are for covering old walls and for curves, not for new framing at 24 in.
The 1/2 in ceiling at 24 in drops to 16 in framing when a water-based spray texture is applied[1].
Which drywall size to buy
Choose the longest sheet you can carry and fit through the door, because fewer sheets mean fewer joints to tape. Common choices:
- 4 × 8: easiest to carry and the only size that fits many stairwells; most joints.
- 4 × 12: one sheet spans a 12 ft wall hung horizontally, so a standard 8 ft wall is two rows with a single seam.
- 54 in × 12: two rows cover a 9 ft wall without a filler strip.
Count sheets for a room with the drywall calculator, which also totals screws, tape and joint compound; the stud calculator gives the framing behind it.
Screws and fastening by sheet size
Screw spacing comes from the same code table: 12 in on ceilings and on walls framed at 24 in, 16 in on walls framed at 16 in[2]. The handbook's fastener schedule for wood framing gives nails at 7 in on ceilings and 8 in on walls[3]. A 4 × 8 wall sheet on studs at 16 in takes about 28 screws at 16 in spacing; the drywall calculator uses that count.
Drywall size mistakes
- Buying sheets too long to deliver. Measure stairs and door openings before ordering 12 or 14 ft sheets.
- 1/2 in ceilings at 24 in hung parallel to the joists. The table allows 24 in only across the joists.
- Regular board where Type X is required. Fire-rated assemblies need the board named in the assembly, usually 5/8 in Type X.
- Ignoring weight. A 4 × 12 sheet of 5/8 in board weighs about 106 lb; plan for two people or a lift on ceilings.
Frequently asked questions
What size does drywall come in?
4 ft wide (also 54 in) and 8, 9, 10, 12 or 14 ft long, in 1/4, 3/8, 1/2 and 5/8 in thicknesses.
What is the standard drywall thickness for walls?
1/2 in. The IRC allows it on walls framed at up to 24 in on centre.
How much does a sheet of drywall weigh?
About 54 lb for a 4 × 8 sheet of 1/2 in regular board and 70 lb for 5/8 in fire-rated board, using the handbook's 1.7 and 2.2 lb per sq ft.
Should I use 1/2 or 5/8 drywall on a ceiling?
1/2 in hung across joists at 16 or 24 in meets the IRC; 5/8 in is required for fire-rated ceilings and sags less.
How many square feet is a sheet of drywall?
A 4 × 8 sheet covers 32 sq ft, a 4 × 10 sheet 40 sq ft and a 4 × 12 sheet 48 sq ft.