I am working on a project that has Fire-Retardant-Treated (FRT) wood that is over 50-years old.
The wood is installed in a conditioned space (not subjected to sunlight or rain, heated and cooled with moisture levels maintained like any building). The wood had different manufacturers with varying labels, but two did list the chemical used as PROTEXOL.
I'm struggling to find information for the efficacy of the FRT wood after so many years.
Do you have any information or recommendations for recertifying FRT wood with lab testing for the presence of the correct chemicals or subjecting samples to ASTM/UL/NFPA?
Any help is greatly appreciated.
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