Re: polyisocyanurate (rigid foam) insulation
here is the response from the mfg:
>>>
The working service temperature of Celotex is -15 to + 100 degrees.
If used consistently outside these parameters, the board would start to
degrade.
>>>
i presume it is in degrees C since it is a UK company....which is not even the 300F i had read.
either way, with 2" of mineral wool between it and the heat, it should work as an additional layer of insulation.
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