In fire stop systems, what does the 'T Rating' measure?

The 'T Rating' in fire stop systems specifically measures the temperature rise on the unexposed side of a fire barrier assembly during a fire exposure. This rating is critical in ensuring that, while the exposed side of the assembly is subjected to flames and heat, the temperature on the non-exposed side remains within safe limits to prevent ignition of adjacent materials or structures.

Understanding the significance of the 'T Rating' is important for fire safety as it helps quantify the effectiveness of the fire stop system in protecting the integrity of the building’s structure and delaying the spread of fire and smoke. It is part of the broader analysis of fire-rated systems that also consider factors like duration of fire resistance and smoke containment, but the 'T Rating' specifically addresses temperature control.