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The requirement for the label on fire-retardant-treated wood to include the flame spread index is important because the flame spread index provides critical information about the material's behavior in the event of a fire. This index indicates how quickly flames can spread across the surface of the treated wood, which is vital in assessing the safety and performance of the building material in fire situations.

In building codes, understanding the flame spread index helps architects, builders, and safety officials determine suitable applications for the wood and ensures compliance with safety standards. This information allows for informed decision-making regarding how and where the treated wood can be utilized effectively within construction projects, ultimately contributing to the overall fire safety of a structure.

Other information, such as the type or location of installation, while useful, is secondary to the flame spread index when it comes to assessing the fire performance of treated wood.