How Thick Is Drywall?

Drywall, also known as plasterboard or gypsum board, comes in various sizes to meet different building requirements. Choosing the appropriate sheet size helps ensure durability, soundproofing, and fire resistance for your walls or ceilings. Below, we break down the common sizes and their best uses.

Standard Drywall Thicknesses

1/4 Inch (6.35 mm)

This is the thinnest type of board available. It is lightweight and flexible, making it ideal for:

  • Adding a new layer over existing walls or ceilings
  • Creating curved features like archways or rounded surfaces

However, this thin sheet isn’t recommended for structural walls due to its fragility.

3/8 Inch (9.5 mm)

Less common in modern construction, this size is sometimes used for:

  • Minor repairs or remodeling
  • Patching thin walls in older buildings

It lacks the strength and rigidity provided by thicker options.

1/2 Inch (12.7 mm)

This is the standard option for interior walls in residential homes. It offers a good balance of:

  • Strength
  • Ease of installation
  • Cost-effectiveness

This size is widely used for walls and ceilings in living rooms, bedrooms, and hallways.

5/8 Inch (15.9 mm)

The thickest of the standard choices, this board is preferred for:

  • Ceilings, as it resists sagging
  • Areas needing extra sound control
  • Fire-rated assemblies, including garages or between units in multi-family housing

While heavier and more challenging to install, it provides greater durability and safety features.

Chart showing drywall thickness options and maximum frame spacing for single and double-layer applications.

Specialty Types of Drywall

Moisture-Resistant Boards

Often called green board, this material is available in 1/2 inch or 5/8 inch sizes. It works well in:

  • Bathrooms
  • Kitchens
  • Laundry rooms

While it holds up better than regular sheets in humid conditions, it isn’t waterproof.

Fire-Rated Boards

These panels are generally 5/8 inch thick. They help slow down fire spread and are required by many building codes for:

  • Walls beside garages
  • Dividing walls in multi-family homes
  • Staircases and utility spaces

Fire-resistant options provide added safety in critical areas.

Soundproof Panels

Designed for noise control, these sheets usually measure 5/8 inch or more. They combine layers of gypsum with other materials and are often chosen for:

  • Home theaters
  • Recording studios
  • Shared walls needing sound reduction

What to Consider When Choosing the Right Size

When deciding on panel size:

  • Ceilings: Thicker options help prevent sagging over time.
  • Regulations: Certain spaces (like fire-rated areas) may require specific sizes.
  • Weight: Heavier boards can be harder to install.
  • Cost: Specialty types may come with a higher price tag, but their benefits often outweigh the cost.

Conclusion

Panels typically range between 1/4 inch and 5/8 inch in thickness. The most common choice for walls inside a home is 1/2 inch. For ceilings or fire-rated areas, thicker materials are often the better option. Always check local codes and consider your specific project needs before making a selection.

When working with any type of paneling, including fire-rated or moisture-resistant boards, it’s important to use the right products for finishing joints and repairs. Learn more about how to choose and apply drywall spackle for a smooth, professional result.

Leave a Comment