A while back there was a discussion about the problems of i-joist and fire.
Here is a site by the Wood i-joist association. They have a film and booklet about wood and i-joist.
http://www.i-joist.org/fire.asp
The booklet indicates that they are looking for reports from fire departments so that they can research the problem and “fixes”.
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Many years ago, while researching another subject (Libraries are good that way.)I came across a book with a name similar to " Building Construction for Fire Fighters".
It made a point about post and beam construction being better for fire fighters in that it takes a fire a relatively long time to burn through the thicker members common to that method. This is compared with lighter framing that exposes more surface area, burns faster and destroys the core strength of the framing more rapidly.
The lighter framing leaves fire fighters less time to safely enter the structure and actively fight the fire. Extrapolating from this I would think that the thin web of a wood I-beam would be particularly quick, especially in those with holes in the web, to catch, burn and fail.
A point made in the book was that firemen on light frame construction are more quickly pulled out and shift their efforts from saving the structure to preventing it from spreading to surrounding buildings. I would think this shift would happen even quicker for building with wood I-beams.
I suspect that this could be countered by painting, maybe the manufacturers could do it at the factory, the I-joists with a retardant or intumescent paint.