Residential Building Inspector Practice Exam

The fire-resistance-rated wall assembly between units in a two-family dwelling must be tested in accordance with which standard?

1. ASTM E 119

2. UL 263

3. Both ASTM E 119 and UL 263

4. IBC 703

The correct answer is: Both ASTM E 119 and UL 263

The fire-resistance-rated wall assembly between units in a two-family dwelling needs to meet specific requirements to ensure the safety and integrity of the structure in the event of a fire. Both ASTM E 119 and UL 263 are standards that define the protocols for fire tests of building construction and materials. ASTM E 119 evaluates the fire resistance of building elements, including wall assemblies, by determining how they perform under fire exposure conditions. This test provides a standardized method for measuring the time a wall can contain a fire, which is critical for residential units where occupants must be protected from fire spread. Similarly, UL 263 serves as a test method for fire-resistance-rated assemblies. It focuses on establishing how long a wall can maintain its structural integrity and limit the passage of heat and flames. Compliance with UL 263 is widely recognized and often specified in building codes as an acceptable proof of a wall assembly's fire resistance. Since both standards are recognized for testing the performance of fire-resistant wall assemblies, they complement each other, affirming the necessity for dual compliance to ensure thorough evaluation of fire-resistance in residential construction. Acknowledging both standards is essential for achieving the necessary fire safety requirements in multi-family dwellings.