Understanding Fire Resistance Levels (FRL): More Than Just Numbers

Fire Resistance Levels (FRLs) are a fundamental part of building safety, but they’re often misunderstood. Whether you’re designing, constructing, or maintaining a building, knowing how FRLs work is crucial. Let’s break it down and highlight why compliance matters.

What is an FRL?

An FRL consists of three numbers, measured in minutes, that determine how well a building element will perform in a fire. For example, an FRL of 60/60/60 means:

• Structural Adequacy (60 mins) – The element maintains its load-bearing function.
• Integrity (60 mins) – It prevents flames and gases from spreading.
• Insulation (60 mins) – It resists excessive heat transfer.

Why Does It Matter?

Fire-resistant barriers exist to protect lives. Designers and contractors must ensure:

• Materials meet the required FRL.
• Correct sealants are used—matching the FRL of walls or floors.
• Installers follow strict construction techniques.

Common Mistakes That Can Be Deadly

Even small errors can compromise an FRL rating:

• Using the wrong sealant depth.
• Leaving gaps or open perpends in boundary brick walls.
• Unauthorised modifications by clients.

Respect the Science, Protect Lives

Building safety isn’t just about calculations—it’s about execution. An improperly sealed joint or an open hole in a fire-resistant barrier can mean the difference between safety and disaster.

Get FRLs right, use the right materials, and ensure your team understands their importance. Because in a fire, every minute counts.

For more compliance insights, check out Building Tools™ Blog.