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Roof Retro-fit

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Virtually all of the metal building manufacturers, including MBCI, offer 
retrofit metal roofs and provide the engineering along with their 
proprietary retrofit roofs.  (It says something about pre-engineered metal 
buildings, doesn't it.)  The latest issue of Metal Architecture or Metal 
Construction News (pubs of the metal building industry) devoted the entire 
issue to retrofit roofs.  I threw my copy out the other day, but any metal 
building supplier should be able to get you a copy.

The problem that I have run into with retrofit roofs is that the original 
building is designed down to the "gnat's eyebrow" and cannot usually support 
additional DL without seriously encroaching into the live load capacity.

I would not install *any* structural support on foam roofing.  There will be 
so many penetrations of the foam that it will be easier to remove the foam 
than to cut penetrations.

A. Roger Turk, P.E.(Structural)
Tucson, Arizona