"Andy Dingley" wrote in message
...
On 4 Aug, 17:51, Adam Aglionby wrote:
Obviously roofing grade concrete
http://www.youtube.com/watch?v=diZU4bfxrKw

Flour mill. They're always difficult to demolish, as they're so
strongly constructed. Must be one of the few buildings where you could
tip it on its side without it immediately self-dismantling under
gravity.

Just out of interest, why are flour mills so strongly constructed?
Presumably all that strength costs money and isn't done without good reason.

Tim