[GSBN] Fwd: Re: [nbne] Fwd: [Fwd: Re: Fire in SB]
mark at buildinggreen.com
Mon Mar 30 18:09:45 CDT 2009
From: Robert Riversong <turningtide at ponds-edge.net>
>>The fire started in the crawlspace of the stick-framed addition and
>>burned most of the wood structure before moving into the SB part of
>>the house. He claims that all the foam had a part in intensifying
>>the blaze (by keeping all the heat inside, and by off gassing), but
>>I'm not sure about that. (anyone?)
>Absolutely. The first thing we do at a structure fire is ventilate
>the building to release superheated air (a structure fire can
>quickly rise to 3500F. Foam, particularly if it's treated with
>fire-resistant chemicals, will prevent a fire from self-ventilating
>and will contain the superheated air. It can raise the heat to many
>thousands of degrees in a very short time and can cause a flashover
>as the surface burns off, producing very toxic fumes and quickly
>spreading the fire to other combustibles.
>While spray urethane foam will generally not support fire on its
>own, if fueled by wood or other combustibles it can dramatically
>accelerate a fire. Of course, the well-insulated and relatively
>fire-proof bale walls would also contain and accelerate the fire.
>>Erik thinks the fire crew may have knocked the SB walls down. (I
>>don't know much about fire-fighting procedures, but that seems
>>pretty reasonable to assume... for safety reasons.
>It's possible that the collapsing roof kicked some of the walls out
>and the collapsing floor may have done so as well. But it's also
>likely that the fire fighters would have dismantled the bales to
>make sure that there was no hidden smoldering fire - much as they
>wwould do at a hay barn fire.
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