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Frequently Asked Questions

How does fire retardant treatment (FRT) affect fire endurance?
Does fire retardant treatment (FRT) make wood non-combustible?

Fire retardant treatments (FRT) on wood products retard the ability of flames to spread across the surface of wood products. However, fire retardants do not reduce the rate at which wood degrades when subjected to an external heat source. Accordingly, fire retardant treatments do not impact fire endurance ratings to any significant extent.

FRT wood does not meet the requirements for non-combustible materials. However, in recognition of its very low flamespread characteristic, building codes typically allow FRT wood to be used in certain non-structural applications in buildings otherwise required to be of non-combustible construction.

See also: FRT Publications

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