Condensation Risk Calculator — 1D Heat Transfer | PsychroCalcLab

Analyze condensation risk in multi-layer walls using 1D steady-state heat transfer. Prevent mold by identifying interstitial condensation points.

How to Use

  1. Define wall layers and input inside/outside conditions.
  2. The results update automatically as you change the input values.
  3. Review the calculated value and the engineering notes shown below the result.

Frequently Asked Questions

What causes condensation inside a wall?

Condensation occurs when the temperature at any point within the wall layers drops below the dew point of the air migrating through it.

How can I prevent wall condensation?

Adding a vapor barrier on the warm side of the insulation and ensuring adequate external ventilation are standard methods to prevent interstitial condensation.

What does a 1D heat transfer model do?

It calculates the temperature gradient across the wall layers from inside to outside, allowing you to see exactly where the temperature crosses the dew point line.

Are the results from this calculator fully accurate for complex walls?

This tool uses a 1D steady-state method which provides a good baseline estimate. For complex walls with thermal bridging or dynamic weather patterns, a 2D or 3D transient hygrothermal analysis is recommended.