What is the required flame-spread index limit for finishes used on walls and ceilings?

The required flame-spread index limit for finishes used on walls and ceilings is established to enhance safety in building designs. A flame-spread index of 200 is significant as it indicates that the material can resist fire spread to a moderate degree, making it suitable for various applications in commercial and residential buildings. This standard is often referenced in building codes and fire safety regulations, which aim to protect occupants and property by minimizing fire hazards.

Materials with a flame-spread index below 200 are generally considered to have good fire-resistant properties, thereby contributing to safer building environments. This level of simplicity in ratings also helps achieve compliance with building codes while providing flexibility in material choices.