California Residential Inspector Practice Exam

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What is the minimum flame spread index for wall assemblies?

  1. 20

  2. 25

  3. 30

  4. 35

The correct answer is: 25

The minimum flame spread index for wall assemblies is set at 25 to ensure a level of fire safety in residential structures. The flame spread index is a measure of how quickly a flame would spread across the surface of a material in the event of a fire. Achieving an index of 25 or lower indicates that the material has been tested and meets fire safety standards, as it slows the spread of flames and provides occupants additional time to evacuate the building. This regulation is grounded in fire protection principles, which aim to minimize the risk of rapid fire development and adequate time for emergency responses. Building codes are structured to provide guidelines that help ensure materials used in residential construction will not contribute excessively to fire hazards.

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