Cold Pipe Insulation Condensation Calculator
Calculate minimum insulation thickness to keep cold chilled water and refrigeration piping above the ambient psychrometric dew point, preventing condensation sweating.
Cold Fluid & Ambient Humidity
Insulation Material & Jacketing
Anti-Condensation Sizing
Frequently Asked Questions
Why do cold pipes "sweat" and why is it dangerous?
When an uninsulated or under-insulated cold pipe runs through humid ambient air, the outer surface temperature drops below the air dew point. Moisture vapor condenses into liquid water, dripping onto drop-ceilings and electrical equipment, causing mold proliferation and destructive Corrosion Under Insulation (CUI).
Why does a shiny aluminum jacket require THICKER insulation to prevent condensation?
Because aluminum has a very low thermal emissivity (ε ≈ 0.05), it absorbs heat very poorly from the room air via radiation. As a result, an aluminum jacket runs 2°F to 5°F colder than a black rubber or white PVC jacket under identical ambient conditions, requiring up to 30-50% thicker insulation to stay above the dew point.
What is a zero-perm vapor barrier?
Unlike hot pipes where moisture is driven outward by heat, cold pipes experience an inward water vapor pressure driving force. A zero-perm jacket (such as multi-ply foil laminates or cellular glass with sealed joints) completely prevents moisture migration from entering and soaking the insulation.