Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the maximum allowed flame spread index for fire-retardant treated wood?

1. 50

2. 25

3. 15

4. 0

The correct answer is: 25

The maximum allowed flame spread index for fire-retardant treated wood is set at 25. This means that materials classified under this specification can be utilized in construction while minimizing the potential for fire spread. The rationale behind this standard is primarily safety, as a lower flame spread index indicates a reduced rate of flame propagation on the surface of the material, making it less likely for fire to spread quickly in the event of ignition. Fire-retardant treated wood is commonly used in areas where there is a heightened risk of fire or where codes require certain materials to have specific fire resistance capabilities. By ensuring that the flame spread index does not exceed 25, building codes promote safer construction practices and help to protect both occupants and property in the event of a fire. Higher indexes would denote a greater risk, undermining fire safety standards.