Class A interior wall and ceiling finishes have a flame spread rating of what range?

Class A interior wall and ceiling finishes are designated by a flame spread rating in the range of 0 to 25. This rating indicates that materials classified in this category have a very low spread of flame, which significantly enhances fire safety in commercial buildings. Materials achieving this rating are typically made from non-combustible substances or treated with fire-retardant chemicals, contributing to reduced fire risk and allowing for better evacuation safety.

In commercial building codes, Class A materials are often required in high-occupancy buildings or spaces where fire safety is a primary concern. By ensuring that finishes are rated within this low flame spread range, building inspectors can help ensure the structural safety and compliance of commercial properties with fire safety regulations. This is particularly crucial in preventing the rapid spread of fire, which can lead to extensive damage and pose serious risks to life and property.