In a message dated 11/12/1999 8:29:20 AM Eastern Standard Time, [log in to unmask]
writes:

> Keep in mind thermal stress on the masonry as the sun goes past each day. On
>  a tower structure there is a twisting movement from sun heat.
>
>  ][<en

Ken, is twisting movement lateral or vertical?  Do you mean a tower structure
where height >= 4xwidth, or just any exposed structure?

Your old friend, Chubby