Easy Paint Calc

How many sheets of drywall for a 2 car garage?

Short answer

A 24 × 24 ft two-car garage with 8 ft walls needs 28 sheets of 4 × 12 drywall for the walls and ceiling: 1,212 square feet after a 16 × 7 ft garage door and an entry door, plus 10% waste.

How to work it out

  1. Walls: 2 × (24 ft + 24 ft) × 8 ft = 768 sq ft − openings 132 sq ft = 636 sq ft
  2. Ceiling: 24 ft × 24 ft = 576 sq ft
  3. 1,212 sq ft × 1.1 waste ÷ 48 sq ft per 4×12 sheet = 27.78 → 28 sheets

A 24 × 24 ft garage is the common two-car size, and it is a big drywall job: 576 sq ft of ceiling alone, plus nearly 640 sq ft of wall after the doors. 4 × 12 sheets suit it, since every wall and the ceiling are multiples of 12 ft.

Adjust for your project

ft
ft
ft
Only big ones such as picture windows; ordinary windows are usually cut out of full sheets
4 × 12 sheets mean fewer joints on long walls and ceilings, but they are heavy: about 60–77 lb for 1/2 in
More options: Door · Window · Other …
sq ft
sq ft
sq ft
A 16 × 7 ft garage door is 112 sq ft; a 6 ft patio door about 40
%
For cut-offs and mistakes. 10–15% is a common planning range
Sheets to buy28 sheets4×12
Drywall area
1,212 sq ft
Walls alone (if bought separately)
15 sheets
Ceiling alone (if bought separately)
14 sheets
You’ll also need (USG estimate)
about 12.1 gal of joint compound, 448 ft of paper tape and 3.3 lb of 1-1/4 in drywall screws
  • Sheets are counted by area plus the waste allowance. Plan the layout too: hang ceilings first, run sheets across the joists or studs, and stagger the end joints.
  • Walls (15) and ceiling (14) rounded up separately add to 29, one more than the room as a whole: offcuts from one part fill gaps in the other, so the whole-room count is enough if you buy and cut them together.
Check your codeBuilding codes set the type and thickness of drywall in some places. Under the International Residential Code (R302.6), the garage side of a wall between an attached garage and the house needs gypsum board at least 1/2 in thick, and 5/8 in Type X is required on the garage ceiling when there are habitable rooms above it. Local codes amend this; check with your building department before you buy.

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Drywall panel liftHolding 4 × 12 sheets overhead while you drive screws is the hardest part of the job. A rented or bought panel lift does it for you.
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Sheets by sheet size (same room)

Sheets by sheet size (same room)
SheetSheets to buy
4×842 sheets
4×1034 sheets
4×1228 sheets
54 in × 1225 sheets

What to know about drywalling a 2-car garage

  • 1,212 sq ft. Walls 4 × 24 × 8 = 768 sq ft, less 112 for the garage door and 20 for the house door, plus the 576 sq ft ceiling.
  • 28 sheets of 4 × 12 with 10% waste (27.8 rounded up), or 42 sheets of 4 × 8.
  • 9 ft walls: about 30 sheets of 4 × 12. 20 × 20 garage: about 21.
  • Fire separation. Under the IRC (R302.6), the garage side of a wall shared with the house needs at least 1/2 in gypsum board, and the garage ceiling needs 5/8 in Type X when there are habitable rooms above. Your local code may amend this, so ask your building department before buying; it changes the board, the weight and the price.

Garage ceilings often hold storage or insulation above; USG’s data sheets list how much unsupported insulation weight a ceiling board can carry at each frame spacing, and the garage-door opener and lights need blocking. 5/8 in Type X 4 × 12 sheets weigh about 106 lb each, so 28 of them are well over a ton: have them delivered and stocked.

Finishing 1,212 sq ft takes about 12 gallons of joint compound (three 4.5 gal pails) and 450 ft of tape by USG’s estimate; see the joint compound calculator. Painting the ceiling afterward: how much paint for a 20x20 ceiling shows the scale.

Different size? Use the full Drywall Calculator (Sheets for a Room).

What you’ll need

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Frequently asked questions

How many 4x8 sheets of drywall for a 2 car garage?

42 sheets of 4 × 8 for walls and ceiling of a 24 × 24 ft garage.

How many sheets of drywall for a 24x24 garage with 9 ft walls?

30 sheets of 4 × 12, walls and ceiling.

How many sheets of drywall for a 20x20 garage?

21 sheets of 4 × 12 for walls and ceiling with 8 ft walls.

Other common sizes

Sources