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What Are the Different Tunnel Test Flame Spread Ratings? Each tunnel test will produce a numerical flame spread index (rating), usually 200 or less. The ratings are grouped into classes, labeled from A through C, with Class A being the best with an index of 0-25.
What is flame spread index and rating? Discover the factors that influence fire spread in a building's interior finish material from Class A to E. Learn more!
Table 803.13 of the IBC provides flame spread classification requirements for wall and ceiling finishes, based on occupancy, location, and presence of automatic sprinklers. Requirements for business and mercantile occupancy are as follows: Flame Spread Class Requirement for Business and Mercantile Occupancy
assigned flame-spread ratings meeting fire safety regulations in building codes. Western lumber species are well suited for these interior finish applications and often outperform other species and wood-based products in fire safety ratings. Western species tested for flame-spread have earned ratings favorable for applications requir-
The flame spread index value is expressed as an arbitrary numerical value, where the asbestos-cement board has a rating of zero, and red oak has a value of one hundred. Each of the fire rating classifications has a flame spread index range assigned to it.
Flame spread rating by material. Different materials have higher and lower flame spread rating. The chart below compiles information from various sources and shows flame-spread ratings for some common building materials according to the Louisiana Fire Marshal website:
When it comes to decking for your home, fire safety is crucial, especially in wildfire-prone areas. Understanding flame spread ratings and choosing materials with an Ignition Resistant designation, a Class A Flame Spread Rating, and/or WUI Compliance can help protect your home and loved ones.
The reported flame spread index represents a product containing a mixture of these species. When lumber is from a single species refer to the specific species flame spread index.
NFPA 286 Standard Methods of Fire Tests for Evaluating Contribution of Wall and Ceiling Interior Finish to Room Fire Growth, measures flame spread in a room configuration, including fire spread along walls, ceilings, and combinations of both.
Fire-retardant treatments can be used to reduce the flame spread index of wood to 25 or less. Lists of the fire-retardant coatings and pressure trea ters are also available from the Fire Safety of Wood Products Research Work Unit.