Why Cold Water Pipes Sweat: Condensation Causes and Prevention Tips

Condensation forms when warm, humid air contacts a cold surface (pipe). The air cools, can't hold moisture, and water droplets form.

Factors Increasing Sweating

• Colder pipe temperature
• Higher ambient humidity
• Stagnant air (poor ventilation)

Prevention

• Insulate cold water lines.
• Improve ventilation in pipe areas.
• Use a dehumidifier.
• Keep water supply temperature as warm as feasible.