Drying Goal

Target indoor GPP based on outdoor conditions.

Run the calculator

Example

You enter

Outdoor temperature (°F) 80
Outdoor RH (percent) 70
Indoor temperature (°F) 72
Margin (GPP below outdoor) 10

You get

Outdoor GPP 108
Target indoor GPP 98
Target indoor RH 83 %

Checked against published worked examples from: IICRC.

Details, formula, and sources

Formula or tableTarget indoor GPP = outdoor GPP - drying-gradient. IICRC S500-2021 'normal-drying' guidance: target 5-15 GPP below outdoor; psychrometric chart drives the dry-bulb / RH set point that delivers the target.

Source and editionIICRC S500-2021 (Standard for Professional Water Damage Restoration) by name.

Free accessIICRC standards licensed; principles free in published water-damage-restoration training literature.

What governsEstimate. AHJ and licensed professional govern.

API field namesoutdoor_temperature_F, outdoor_RH_percent, indoor_temperature_F, margin_GPP, outdoor_GPP, target_indoor_GPP, target_indoor_RH_percent

Drying gradient 5-15 GPP below outdoor (S500 normal-drying band) unless user suppliesIICRC S500-2021