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1985 pre-manufactured building

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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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