Drywall Types and Sizes

Standard Drywall Sizes

The most common drywall size is 4×8 feet (32 sq ft per sheet). Other common sizes include 4×10 (40 sq ft) and 4×12 (48 sq ft). Taller sheets reduce horizontal joints for a smoother finish on high walls.

Use 4×8 sheets for standard 8-foot walls. For 9-foot or 10-foot ceilings, consider 4×10 or 4×12 sheets to minimize joints. Larger sheets are heavier and may require two people to install.

Thickness Options

1/4-inch drywall is used for curved surfaces and as a skim coat over existing walls. 3/8-inch is sometimes used in remodeling. 1/2-inch is the standard for most residential walls and ceilings. 5/8-inch (Type X) is fire-rated, required between garages and living spaces, and recommended for ceilings.

5/8-inch drywall provides better soundproofing and is more resistant to sagging on ceilings. Many building codes require 5/8-inch for ceiling installations to prevent sag between joists.

Specialty Drywall Types

Moisture-resistant (green board or purple board) is designed for bathrooms, basements, and kitchens. Mold-resistant drywall includes additives to prevent mold growth. Fire-rated (Type X) contains glass fibers for fire resistance. Soundproof drywall has dense cores for noise reduction.

Choosing the Right Type

For most rooms, standard 1/2-inch drywall is sufficient. Use moisture-resistant drywall in bathrooms and basements. Use fire-rated 5/8-inch drywall in garages, near furnaces, and between living units. For home theaters or bedrooms, consider soundproof drywall for better acoustics.

Summary

Selecting the correct drywall type and thickness ensures code compliance, durability, and a professional finish. Use our drywall calculator to determine quantities once you've chosen the right board type.