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Class A fire ratings indicate a flame spread rating somewhere between zero and 25. Materials that fall into Class A or Class 1 include things like brick, gypsum wallboard, and fiber cement exterior materials. These materials do not burn well and are very unlikely to contribute fuel to a fire.
Discover how ASTM Class A Fire Rating and IBC, NFPA standards ensure maximum fire resistance. Learn about TWS solutions and the importance of these ratings.
What Is a Class A Fire Rating? The Class A, also known as Class 1, fire rating describes the highest quality of fire-resistant building materials. This class has a flame spread index of 25 or lower, which measures a material’s likelihood of spreading flames.
The Class A fire rating is the most stringent standard available for building materials. It’s usually assigned to retardants that have a flame spread rating of between 0 and 25 during fire tests. Any material with this rating typically has a lower flame spread and a better performance rating than Class B or Class C material.
The five classes of fire are: Class A Fire: Ordinary Combustible; Class B Fire: Flammable Liquids and Gases; Class C Fire: Electrical Equipment; Class D Fire: Combustible Metals; Class K Fire: Cooking Oils and Fats; Class A Fires: Ordinary Combustibles. Ordinary combustibles are the sorts of materials that you will often find around the house.
Most opening protectives have a fire-protection-rating whereas the wall/floor/ceiling assembly has a fire-resistance-rating.
What Is Flame Spread? Flame spread is the propagation of flame across the surface of a material. It’s measured by how fast the material burns and how far the flame spreads once ignited. Flame spread can be both vertical, traveling up a wall to a ceiling, and horizontal, traveling across a floor assembly.
Types of Construction - NFPA
A Class A fire rating represents the highest rating achievable, indicating a flame spread of 0-25 and smoke developed between 0-450. A designation of Class A, or Class I, is considered superior fire protection.
A Class A Flame Spread Rating is the highest level of fire resistance that a building material can achieve. This rating represents the material’s exceptional ability to prevent the rapid spread of flames and significantly reduce the risk of a fire spreading within a structure.