Interior floor finishes are grouped into classes determined by the:

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Multiple Choice

Interior floor finishes are grouped into classes determined by the:

Interior floor finishes are categorized by how easily they ignite under radiant heat, quantified as the critical radiant flux rating from the Steiner tunnel test. This CRF value places flooring into classes (Class I, Class II, Class III) based on how much radiant energy is required to sustain ignition; a higher CRF means better fire performance. Fire-resistance ratings refer to how long a building element resists fire as part of an assembly, not to individual floor finishes, so they don’t determine floor finish classifications. Tests for flame spread or smoke development assess different aspects of fire behavior and aren’t the basis for labeling floor finishes. The CRF rating is the standard used for grouping interior floor finishes.

Interior floor finishes are categorized by how easily they ignite under radiant heat, quantified as the critical radiant flux rating from the Steiner tunnel test. This CRF value places flooring into classes (Class I, Class II, Class III) based on how much radiant energy is required to sustain ignition; a higher CRF means better fire performance. Fire-resistance ratings refer to how long a building element resists fire as part of an assembly, not to individual floor finishes, so they don’t determine floor finish classifications. Tests for flame spread or smoke development assess different aspects of fire behavior and aren’t the basis for labeling floor finishes. The CRF rating is the standard used for grouping interior floor finishes.

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