In todays New York Times the deadly aftermath of banning chrysotile asbestos is finally beginning to see the light of day.
Finally Building code group admits need for better fireproofing...
http://www.nytimes.com/2007/06/23/washington/23wtc.html?th&emc=th
"Fireproofing for steel columns, to prevent a structural collapse, would have to be nearly three times stronger in high rises up to 35 stories and seven times stronger for even taller towers, making it less likely to fall off."
Chrysotile asbestos fireproofing (MonoKote) that was used prior to it's ban in 1973 would meet any new standards easily. The type of asbestos used in 99 percent of buildings using asbestos was shown to be non hazardous by a thorough prospective and earlier retrospective study done by McDonald et al ol, McDonald studied the incidence of mesothelioma, lung cancer and asbestos in miners millers and the communities of three mining towns in canada, (Chrysotile), South Africa(Amosite), and Australia(Crocidilite) asbestos. The three types of asbestos have completely different chemistry and geometry and therefore completely different health risks. McDonald showed that Chrysotile has no detectable risk for asbestosis, lung cancer and mesothelioma. Amosite Asbestos presented a very high risk of all three diseases and Crocidolite was a death sentence to anyone exposed in an occupational setting.
Nevertheless Chrysotile was banned from fireproofing along with all other asbestos form rocks by the New York health department when the towers werealready built out to 54 stories. A substitute was rushed to market that was only tested in an oven with still air. In the subsequent years, much of the remaining chrysotile was removed by the Port Authority. The inventor of asbestos fireproofing from Johns Manville has been quoted as saying at the time that if there is ever a major fire above the 54th floor of the World trade Center, the building will fail.
This is the first official recognition that the substitute fire proofing is inadequate.
Unfortunately, even with the work of Mc Donald, the environmental authorities can never admit an error and allow chrysotile to be legalized.
This is a classic example of a type two regulatory error. Regulating a non hazard. Had chrysotile fireproofing been present in the world trade center buildings, they may well have remained standing for a longer time allowing for less loss of life. Perhaps the fires may have been more contained or stairwells survived longer.
Why has it taken the standards people over 5 years to face the reality of the inadequate fireproofing?
Will the intellectual dishonesty of the regulators who insisted on lumping Chrysotile asbestos with the deadly types of asbestos ever be revealed? Will the environmental regulators ever be held accountable. Will anything be done about all the highrises where inferior subbstitue fireproofing is installed?
How many more will have to die?
Philip Berg
Industrial Hygienist M.S. ( Johns Hopkins Bloomberg School of Public Health 1979