Roofing, Siding & Exterior Building Products worked example

Roll Forming Throughput at 99% expected roll-former uptime: a worked example

Push expected roll-former uptime up to 99% and the picture changes. This example computes every intermediate figure at that operating point. Use it when roll forming throughput in roofing, siding and exterior building products is being asked to take on more work and you need to know if there is room.

The inputs for this scenario

  • Panels formed per roll-former pass: 4 units / cycle (unchanged)
  • Available forming passes in the run: 480 cycles (unchanged)
  • Expected roll-former uptime: 99 % (raised for this scenario; the documented default is 90)
  • Expected panel first-pass yield: 97 % (unchanged)

Working through the calculation

  • Applying the documented formula (Gross roll forming throughput capacity = roll forming throughput output per cycle × available roll forming throughput cycles) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,844 units for good roll forming throughput capacity, the number this scenario is built around.
  • At this operating point the engine returns 1,920 units for gross roll forming throughput capacity.
  • At this operating point the engine returns 19.2 units for roll forming throughput downtime loss.
  • At this operating point the engine returns 57.02 units for roll forming throughput yield loss.

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 10% above the baseline at 1,844 units.
  • It computes good panels per run from output per pass and available passes, derated for roll-former uptime and panel first-pass yield. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Good roll forming throughput capacity: 1,844 units (headline result)
  • Gross roll forming throughput capacity: 1,920 units
  • Roll forming throughput downtime loss: 19.2 units
  • Roll forming throughput yield loss: 57.02 units

Run it with your numbers

  • Every input above is editable in the live Roll Forming Throughput calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.