] [Thread] [Date] [Author]

[Drew Morris <dmorris(--nospam--at)bbfm.com>]

I am evaluating an existing pre-manufactured building that was designed 
in 1985 under the 1982 UBC.  The roof purlins are 12 gage.  Is it safe 
to assume that these are Fy = 50 ksi?  At 33 ksi, they don't meet the 
loads in the General Notes.  Also, would the columns and frames be A36?  
A572 Gr 50 was available then, but I am not sure if that material was 
used by the manufacturers.  Would it have been cheaper to use thicker 
and wider plates of A36 versus some material with Fy = 50 ksi.

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