What is the metal on the corner of a wall called?

The metal on the corner of a wall is called a metal corner bead. In drywall construction, this small but essential component plays a major role in protecting wall edges and creating straight, professional-looking corners. If you’ve ever seen a sharp, clean wall corner in a home, office, or commercial building, there’s a good chance a metal corner bead is hidden beneath the surface.

What Is a Metal Corner Bead?

A metal corner bead is a thin strip made from galvanized steel or aluminum, designed to reinforce and protect outside drywall corners. It is installed where two drywall panels meet at a 90-degree angle. After installation, it is covered with joint compound, sanded smooth, and painted, making it invisible while still providing structural support.

Why Is Metal Corner Bead Needed?

Drywall is relatively soft and prone to damage, especially at corners. Without protection, wall edges can:

• Chip easily

• Crack under pressure

• Dent from impact

• Wear down over time

The metal corner bead acts like a shield, strengthening these weak points and keeping corners crisp and straight.

How Does It Work?

A metal corner bead features:

• A rigid 90° angle that forms a perfect corner line

• Perforated flanges that allow joint compound to pass through and bond securely

• A strong outer edge that defines the shape of the corner

Once embedded in compound, the bead becomes part of the wall system, offering long-term durability.

Where Is It Used?

Metal corner beads are used in:

• Residential homes

• Office buildings

• Hospitals

• Schools

• Retail and commercial spaces

They are especially important in high-traffic areas such as hallways, stairwells, and entryways where walls are more likely to be bumped or hit.

Benefits of Metal Corner Beads

• Impact resistance – Protects corners from daily wear

• Straight, clean lines – Ensures professional wall finishes

• Durability – Extends the lifespan of drywall corners

• Fire resistance – Metal does not burn like plastic

• Structural support – Reinforces weak drywall edges

Related Terms

You may also hear it called:

• Drywall corner bead

• Steel corner bead

• Metal drywall bead

Conclusion

So, what is the metal on the corner of a wall called? It’s a metal corner bead, a crucial drywall accessory that protects corners, improves durability, and helps create smooth, sharp wall edges. Though hidden under paint and compound, it plays a visible role in the quality and longevity of finished walls.