Which test method measures the effectiveness of a firestop system to resist flames and gases?

The test method that measures the effectiveness of a firestop system to resist flames and gases is ASTM E814. This standard specifically evaluates firestop systems by simulating the conditions a firestop might face in a fire scenario. It assesses how well the firestop product can prevent flames, smoke, and gases from passing through openings and joints in construction assemblies, thereby helping to limit the spread of fire within buildings.

ASTM E814 involves subjecting the firestop system to a controlled fire exposure while monitoring its performance over time. This includes measuring the integrity and insulation performance of the firestop, which are critical factors in ensuring that a firestop system can serve its purpose effectively.

In contrast, other options focus on different aspects of fire protection or construction safety. For instance, UL 263 typically pertains to the testing of structural fire resistance of buildings, A117.1 addresses accessibility requirements for buildings, and NFPA 703 discusses the standard for fire-retardant-treated wood. Each of these standards serves a different purpose within the overall context of fire safety and building regulations, highlighting the specificity and importance of ASTM E814 for evaluating firestop systems.