Metal or paper-faced corner bead?

Metal is more impact-resistant and common. Paper-faced mud-on corner bead resists cracking from building movement and will not dent, but requires more skill to install straight.

How do I fix a dented corner bead?

Cut out the damaged section with tin snips, install a new piece overlapping slightly, and re-mud. For minor dents, tap back into shape and re-coat.

What about bullnose corners?

Bullnose corner bead creates a rounded edge instead of a sharp 90-degree corner. It gives a softer, more contemporary look.

Metal Corner Bead

Drywall & Plaster

Trim

$2-$5 per 8 ft piece

Metal Corner Bead: Durable Outside Corner Protection (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

Metal corner bead is a galvanized steel or aluminum trim piece installed on outside drywall corners to create a straight, protected edge. It provides impact resistance and a guide for applying joint compound to a crisp, uniform corner. Available in standard, bullnose, and specialty profiles.

Key Features

Creates straight outside corners; Impact-resistant metal; Guide for compound application; Standard and bullnose profiles; 8 and 10 ft lengths

Specifications

Material: galvanized steel or aluminum. Standard: 1-1/4 in x 1-1/4 in flanges. Length: 8 or 10 ft. Bullnose radius: 3/4 in. Attaches with nails

screws

or crimps.

Applications

Outside drywall corners; Window and door returns; Soffits and bulkheads; Archway edges; Column wraps

Installation Overview

Cut to length with tin snips. Attach to corner with drywall nails every 6-8 inches on alternating flanges, or use a crimping tool. Apply three coats of joint compound over flanges, feathering 8-12 inches wide on each side.

Pros & Cons

Pros

✓ Creates perfectly straight corners; Impact resistant; Easy to install; Provides compound guide; Long-lasting

Cons

✗ Can dent on impact; Shows through if compound is too thin; Rusts if coating is damaged; Must be straight when installed; Can be hard to cut

Top Brands

USG

ClarkDietrich

Trim-Tex

Phillips Manufacturing

Code Requirements

Required at all outside drywall corners per IRC R702.3.1. Must be finished with joint compound. Fire-rated assemblies may specify corner bead type.

Buying Tips

Paper-faced corner bead is gaining popularity because it resists cracking better than metal. For high-traffic areas, metal remains the most impact-resistant choice. Buy a corner bead crimper tool for fast installation.