Final answer:
The required maximum flame spread rating and smoke development for exposed insulation is determined by various fire safety codes and regulations. One commonly used code in the United States is the NFPA 285 test, which measures the flame spread and smoke production of exterior non-load-bearing walls with combustible insulation.
Step-by-step explanation:
The required maximum flame spread rating and smoke development for exposed insulation is determined by various fire safety codes and regulations. One commonly used code in the United States is the NFPA 285 test, which measures the flame spread and smoke production of exterior non-load-bearing walls with combustible insulation. Depending on the specific application and building codes, different flame spread ratings and smoke development classifications may be required.
For example, in the International Building Code (IBC), Class A flame spread rating and Class 1 or Class A smoke development rating are usually required for most forms of exposed insulation. Class A is the highest rating for flame spread and indicates that the material is highly resistant to fire spread. Similarly, Class 1 or Class A smoke development rating indicates low smoke production.
It's important to consult local building codes and regulations to determine the specific flame spread and smoke development requirements for exposed insulation in a particular jurisdiction.