The building codes permit the use of fire-retardant-treated (FRT) wood or FRT plywood in some situations where noncombustible materials are required, although both these materials are not recognized by codes as noncombustible materials. Explain the reasons.
What will be an ideal response?
Both these materials do not pass ASTM E136 test that determines if a material is noncombustible. However, the fuel contribution of FRT wood or plywood in (early stages of) fire is sufficiently low to be allowed as substitute for noncombustible materials.
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