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"The fight is never about grapes or lettuce. It is always about people." Cesar Chavez |
:: Thursday, December 11, 2003 ::
Fire-Resistant Details by John Underwood, Fine Homebuilding
Houses burn from inside out
At 400°F, curtains, wallpaper and bedding ignite. Wood studs spontaneously combust, or pyrolize, at about 450°F (steel studs melt and deform at only slightly higher temperatures). At that point, single-pane windows blow out from heat and ambient-pressure differences. Flame and heat rush in to meet interior combustion, thoroughly consuming structures. Whole houses can reach temperatures hot enough to weaken and spall concrete foundations. According to Laguna Beach Fire Chief Rich DuBerry, many if not most of the Laguna homes lost to fire burned from inside out.
Extreme heat -- with or without direct flame -- compromised the envelopes of houses and ignited material inside by entering houses through vents; poorly sealed doors or windows; and cracks in walls, subfloors or attics.------------------------------------------- posted 6:55 AM :: reference link ::
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