What does a T Rating measure in fire stop systems?

The T Rating specifically measures the temperature rise on the unexposed side of a fire stop system during a fire test. This rating is crucial because it indicates how much heat is transferred through the fire barrier to the side that is not in direct contact with the fire. A lower temperature rise signifies that the fire stop system is more effective in maintaining safety on the unexposed side, helping to protect areas such as adjacent spaces or critical infrastructure from heat damage during a fire event.

Understanding the T Rating is vital for ensuring that firestop systems effectively maintain safe conditions and functional integrity during fire incidents, thereby preventing the spread of fire and protecting lives and property. This temperature measurement is part of the overall performance criteria for firestop systems, alongside other ratings such as the F rating, which measures fire containment time.