What is a metal corner bead used for?

A metal corner bead is used in drywall construction to reinforce and protect the exterior corners of walls. It provides a straight, clean edge and prevents damage from impacts, such as bumps from furniture or foot traffic.

Key Functions of Metal Corner Bead

1. Reinforcement – Strengthens and protects drywall corners from cracks, chips, and dents.

2. Straight Edges – Ensures sharp, uniform corners for a professional finish.

3. Base for Joint Compound – Helps hold joint compound (mud) in place for a smooth, seamless appearance.

4. Durability – Made of galvanized steel or aluminum, it resists moisture and rust in high-humidity areas.

Types of Metal Corner Beads

• Standard Metal Bead – A simple L-shaped design for general drywall corners.

• Bullnose Bead – Rounded edges for a softer, curved corner look.

• Vinyl-Coated Metal Bead – Offers additional moisture resistance and flexibility.

• Archway Bead – Flexible to fit curved walls and archways.

Installation Methods

• Nail or Screw Attachment – Fastened directly to the drywall.

• Crimping – Pressed into place with a crimping tool.

• Adhesive or Spray Glue – Used in some applications for a seamless bond.

After installation, the corner bead is covered with multiple layers of joint compound, sanded, and painted for a smooth, finished look.