Roofing, Siding & Exterior Building Products worked example

Roll Forming Throughput at 65% expected roll-former uptime: a worked example

Suppose expected roll-former uptime falls to 65%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate roll forming throughput for roofing, siding and exterior building products using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Panels formed per roll-former pass: 4 units / cycle (held at the documented default)
  • Available forming passes in the run: 480 cycles (held at the documented default)
  • Expected roll-former uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • Expected panel first-pass yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross roll forming throughput capacity = roll forming throughput output per cycle × available roll forming throughput cycles.
  • Good roll forming throughput capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross roll forming throughput capacity works out to 1,920 units at these inputs.
  • Roll forming throughput downtime loss works out to 672 units at these inputs.
  • Roll forming throughput yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where expected roll-former uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • It computes good panels per run from output per pass and available passes, derated for roll-former uptime and panel first-pass yield. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Good roll forming throughput capacity: 1,211 units (headline result)
  • Gross roll forming throughput capacity: 1,920 units
  • Roll forming throughput downtime loss: 672 units
  • Roll forming throughput yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Roll Forming Throughput calculator, set expected roll-former uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.