[AF] The SF Overpass

[Fee Lee]

I thought only one tower only had the Asbesos coating partial up the 
tower and some other type of coating the rest of the way.  The tower 
that was built first had Asbesos all the way up to the top.  The main 
reason that the coatings failed was that the planes hit the towers 
with such force, the coatings were knocked off the steel beams.
                                           Fee Lee
Dana  Puopolo writes:
>
>I'm sure the steel was not left naked, that some other equally effective fire
>retardant was placed on the steel. Asbesos was primarily used because it was
>plentiful, effecive and very cheap. Other flame retardants were available in
>the mid '70's.
>-D
>------ Original Message ------
>From: "Glen Kippel" <glen.kippel at gmail.com>
>>
>>If memory serves, the twin towers DID have asbestos concrete sputtered
>>over
>>the beams part way up the towers and further application was stopped by
>>the environmental outcry WRT asbestos. Beyond that point, I'm not sure
>>if the steel was naked or some other less effective coating was used.
>>---------------------------
>