That information certainly would NOT be in ProSeries.  ProSeries is a tax program, not a statistical database of non-tax data.

I suspect it will be difficult to find a national average for expenses.
https://www.bls.gov/oes/current/oes472181.htm

Is the taxpayer still in the roofing business?  If so, the most logical method would be to track the current income/expense ratio for that taxpayer's business.