Fire Resistance Rating of Corner Beads
Fire resistance is a critical consideration in modern construction, especially in commercial buildings, high-occupancy areas, and regulated residential projects. While corner beads are primarily used for edge protection and finishing, their material type and compatibility with fire-rated wall systems can influence overall fire performance. Understanding the fire resistance rating of corner beads helps ensure compliance, safety, and long-term durability.
What Is Fire Resistance Rating?
Fire resistance rating refers to the ability of a wall system or building component to withstand fire exposure for a specified period (such as 30, 60, or 120 minutes) without structural failure, flame spread, or excessive heat transfer. Corner beads themselves are not usually fire-rated as standalone products, but they must be compatible with fire-rated drywall or plaster systems.
Do Corner Beads Have a Fire Rating?
Corner beads do not typically carry an independent fire resistance rating. Instead, they form part of a complete wall or ceiling assembly that may be fire-rated. The overall fire rating depends on the gypsum board, framing system, joint compounds, insulation, and installation method — with corner beads needing to meet system requirements without compromising fire performance.
Fire Performance of Different Corner Bead Types
1. Metal Corner Beads
Metal corner beads, usually made from galvanized steel, are non-combustible and perform well in fire-rated wall assemblies. They do not contribute to flame spread and maintain structural integrity during fire exposure.
- Non-combustible material
- Compatible with fire-rated drywall systems
- Preferred for commercial and regulated buildings
2. PVC Corner Beads
PVC corner beads are moisture-resistant and flexible but are combustible materials. While they can be used in standard wall systems, their use in fire-rated assemblies depends on local regulations and system approvals.
- Combustible material
- Generally used in non-fire-rated partitions
- Check compliance before use in fire-rated walls
3. Paper-Faced Corner Beads
Paper-faced corner beads consist of a metal or plastic core with paper flanges. When used with fire-rated gypsum board and joint compounds, they are commonly accepted in fire-rated assemblies.
- Good compatibility with fire-rated drywall systems
- Smooth finishing with controlled fire performance
- Common in interior fire-rated partitions
4. Fiber Reinforced Corner Beads
Fiber reinforced corner beads offer enhanced crack resistance and flexibility. Fire performance depends on the fiber composition and system compatibility. Some fiber-based products are suitable for fire-rated systems when approved.
- Varies by manufacturer
- Check certification and approvals
- Often used in stress-prone areas
Choosing Corner Beads for Fire-Rated Wall Systems
When working with fire-rated wall or ceiling assemblies, corner beads should be selected carefully to ensure they do not compromise the system’s fire resistance.
- Use non-combustible metal beads where required
- Follow approved fire-rated wall system details
- Use compatible joint compounds and fixings
- Comply with local building codes and standards
Common Fire Ratings in Wall Systems
- 30-minute rating: Light commercial and residential applications
- 60-minute rating: Offices, apartments, and public buildings
- 120-minute rating: High-risk or high-occupancy structures
Frequently Asked Questions (FAQ)
1. Are corner beads fire-rated products?
Corner beads are not fire-rated individually; they are part of a complete fire-rated wall or ceiling system.
2. Which corner bead is best for fire-rated walls?
Metal corner beads are preferred due to their non-combustible nature and compatibility with fire-rated systems.
3. Can PVC corner beads be used in fire-rated walls?
PVC beads are generally not recommended unless specifically approved within a tested fire-rated system.
4. Do paper-faced beads affect fire resistance?
When used with approved gypsum systems, paper-faced beads typically do not reduce fire ratings.
5. Who determines fire compliance?
Fire compliance is determined by local building codes, fire authorities, and approved system certifications.
Raltro
Raltro Trades supplies a wide range of corner bead solutions suitable for both standard and fire-rated wall systems. From non-combustible metal corner beads to system-compatible finishing profiles, Raltro connects contractors and builders with trusted materials that meet performance, safety, and compliance requirements. Along with corner beads, Raltro offers gypsum boards, joint compounds, and finishing accessories to support safe and professional wall construction.