Construction Products, Windows, Doors & Fenestration worked example

Roofing Material Yield at 67% target roofing material yield: a worked example

This worked example runs the roofing material yield numbers for a tougher week than the baseline: 67% target roofing material yield instead of the typical 93%. Calculate usable roofing material yield from accepted panels, shingles, or roll area versus material issued.

The inputs for this scenario

  • Usable roofing product installed: 18,600 sq ft (held at the documented default)
  • Roofing material issued to job: 20,300 sq ft (held at the documented default)
  • Target roofing material yield: 67 % (the input this scenario stresses; the baseline uses 93)

Working through the calculation

  • The calculation starts from the formula this tool documents: Roofing material yield = usable roofing product area or count ÷ issued roofing material area or count × 100.
  • roofing material yield works out to 91.63 % at these inputs, and this is the headline figure for the scenario.
  • roofing material yield gap to target works out to -24.63 points at these inputs.
  • usable roofing product area or count works out to 18,600 count at these inputs.
  • issued roofing material area or count works out to 20,300 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target roofing material yield sits at 93% and the headline result is 91.63 %, this scenario lands almost exactly on the baseline at 91.63 %.
  • Use it after a job or production run closes to reconcile issued material against usable output and to flag waste outliers. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • roofing material yield: 91.63 % (headline result)
  • roofing material yield gap to target: -24.63 points
  • usable roofing product area or count: 18,600 count
  • issued roofing material area or count: 20,300 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Roofing Material Yield calculator, set target roofing material yield to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.