True or False: T-rating measures the risk of combustible materials igniting due to heat conduction through fire stop materials.

The T-rating indeed measures the risk of combustible materials igniting due to heat conduction through fire stop materials. This rating indicates how well a firestop system can prevent the transfer of heat between different compartments or areas during a fire. Specifically, the T-rating assesses the maximum temperature that can be experienced on the unexposed side of a firestop assembly over a specified time period. This means that if the temperature exceeds the limit set by the T-rating, it could potentially lead to the ignition of combustible materials located nearby.

Understanding this concept is crucial for ensuring that fire stop materials are effective in limiting the spread of fire and protecting buildings and occupants. By evaluating the risks associated with heat conduction, building codes and safety standards can help ensure that firestop systems are installed correctly to maintain overall fire safety in structures.