Window condensation isn't usually caused by the window itself. This article explains why windows sweat during winter, how dew point, relative humidity, and ventilation work together, and why condensation is often a whole-house moisture management issue rather than a defective window.
Why Windows Sweat: Condensation Problems Explained for Builders
Shawna HendersonJuly 31, 2026
Tags: condensation, dew point, humidity, windows
QUICK PRIMER: Thermal Bridging, Dew Points, and Exterior Insulation/Air Barriers
Shawna HendersonDecember 17, 2014
Insulated sheathing materials can provide an air barrier along with a thermal barrier, and solve the biggest challenges of thermal bridging. The challenge of using insulating sheathing as an air barrier is to ensure that the R-value of the sheathing is high enough that it moves the dew point outside...