I am answering this in the silver off-topic list.

Marshall

Judith Thamm wrote:

> Dear Group,
> Just a question that is puzzling my husband - someone who has visited the
> WTC would know... were the steel girders etc exposed and NOT covered by
> concrete?  From the ruins it appears so.
>
> The reason for asking is that building regulations in Australia stipulate
> that structural steel must be encased in concrete to keep it cool in case of
> fire.
> Regards,
> Judith.
>
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