>> Gypsum is good for fireproofing because it has the capacity to 
absorb energy from a fire by driving off the water of crystallization 
again.<<

Wow. Add perlite, which I think is pretty good high temp insulator, to 
your gypsum plaster and you've got a pretty good fire resistant system. 
Are there any info sources that rate traditional construction sytems for 
fire resistance?

Does lime provide a similar capacity to absorb energy?

John

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