Gypsum, Drywall & Interior Panel Manufacturing worked example

Moisture Target Window at 90% max allowable exit moisture: a worked example

Suppose max allowable exit moisture falls to 90%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Check whether dryer exit moisture is within the target window by comparing measured exit moisture to the maximum allowable specification.

The inputs for this scenario

  • Max allowable exit moisture: 90 % (the input this scenario stresses; the baseline uses 125)
  • Measured exit moisture: 100 % (held at the documented default)
  • Design reference moisture: 100 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Moisture headroom = max allowable exit moisture - measured exit moisture.
  • Margin works out to -10 % at these inputs, and this is the headline figure for the scenario.
  • Absolute margin works out to -10 value at these inputs.
  • Available amount works out to 90 value at these inputs.
  • Required amount works out to 100 value at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where max allowable exit moisture sits at 125% and the headline result is 25 %, this scenario comes in 140% below the baseline at -10 %.
  • It computes the moisture headroom between your allowable ceiling and measured exit moisture, then expresses that headroom as a margin against a design reference moisture. 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

  • Margin: -10 % (headline result)
  • Absolute margin: -10 value
  • Available amount: 90 value
  • Required amount: 100 value

Run it with your numbers

  • To rerun this with your own numbers, open the live Moisture Target Window calculator, set max allowable exit moisture to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.