How Many Screws per Sheet of Drywall?
The counts
| Sheet | Screws (walls) | Sheets per lb of screws |
|---|---|---|
| 4 x 8 ft | 32 | 10 |
| 4 x 9 ft | 36 | 9 |
| 4 x 10 ft | 40 | 8 |
| 4 x 12 ft | 48 | 6.7 |
The rule behind the table is simply one screw per square foot of board, which is what the drywall calculator uses for its consumables line. It comes from hanging a sheet across studs at 16 in centres with a screw about every 12 in up each stud and every 8 in along the edges — comfortably tighter than the code minimum, which keeps edges from flexing and tape from cracking.
Where the screws actually go
- Field: one screw roughly every 12 in along every stud or joist the sheet crosses. A 4 x 8 sheet hung horizontally crosses seven studs at 16 in centres.
- Edges: every 8 in, kept about 3/8 in back from the edge so the screw does not crumble the core.
- Ceilings: tighten the field to 12 in maximum everywhere — gravity works on ceilings full time. Plan on 10 to 20% more screws than the wall figure, and many hangers add a bead of construction adhesive on the joists, which also cuts nail pops.
Do not split the difference by over-driving. A drywall screw holds with its head bearing on unbroken paper; a screw that tears the paper face holds almost nothing and has to be backed up by another one beside it. A drill with a drywall depth-setting nose, or a proper screw gun, sets the head a hair below flush without breaking through.
Screw length and thread
| Board | Framing | Screw |
|---|---|---|
| 1/2 in | Wood studs | 1-1/4 in coarse thread |
| 5/8 in | Wood studs | 1-5/8 in coarse thread |
| 1/2 in | Steel studs (25 ga) | 1-1/4 in fine thread |
| Double layer 1/2 + 1/2 in | Wood studs | 1-5/8 in or 2 in coarse |
Coarse thread bites wood; fine thread self-taps light steel. Longer is not better — a longer screw is more likely to wander off a stud edge and snap, and it gains no holding power once about 5/8 in of thread is in the framing.
Buying: think in pounds, not screws
At 1-1/4 in, drywall screws run about 320 to the pound, so a pound does roughly ten 4 x 8 sheets and a 5 lb box does a whole 40-to-50 sheet job. Collated strips for a screw gun cost more per screw and earn it on ceilings and big open walls; loose screws are fine for a room. Either way, buy a pound more than the arithmetic says — dropped screws and stripped heads are part of the job.
Why screws and not nails
Nails hold by friction, and framing lumber shrinks as it dries — a year later the nail stays put while the wood pulls back, and the head telegraphs through the finish as a pop. Screws hold mechanically in the thread and pop far less. If you are re-covering an old nailed ceiling, drive a screw an inch or two from every existing nail before you skim it.
Get the sheet count for any room and the three things people forget to buy with it — screws, joint compound and tape — worked out from the same area.
Frequently asked questions
How many screws for a 4x8 sheet of drywall?
About 32 on walls with studs at 16 inch centres — one screw per square foot of board. Ceilings take 10 to 20 percent more because the maximum field spacing tightens to 12 inches.
Should drywall screws be coarse or fine thread?
Coarse thread for wood studs, fine thread for light-gauge steel studs. Coarse thread grips wood fibre; fine thread self-taps thin steel without stripping.
How far apart should drywall screws be?
Roughly every 12 inches along each stud in the field and every 8 inches along the sheet edges on walls, and no more than 12 inches everywhere on ceilings. Local code sets the maximums; going tighter only costs a few screws.
You might also need
Related calculators
Spotted a wrong number? Report it — corrections ship in the next deploy.