Drywall (gypsum board) comes in several thicknesses for different jobs. This chart shows each thickness and where it is used, plus the common sheet sizes.
| Thickness | Typical use |
|---|---|
| 1/4 in | Curved walls, skim over existing surfaces |
| 3/8 in | Repairs and double-layer applications |
| 1/2 in | Walls and ceilings (most common) |
| 5/8 in | Fire-rated (Type X), ceilings, soundproofing |
Two to know: 1/2 in is standard for most walls; 5/8 in Type X is required for fire-rated assemblies and resists ceiling sag. Sheets come in 4×8, 4×9, 4×10, and 4×12 ft.
See the How to Hang Drywall guide and the Drywall Screw Calculator.