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Condensation Resistance (CR)

CR measures the ability of a product to resist the formation of condensation on the interior surface of the product. Condensation, which can appear as a light coating of water, water droplets, frost, ice, or some combination of the four, forms on any surface when the temperature of that surface is less than its dew point temperature. For example, if the temperature of the glass in a window is 10°C and the dew point temperature for the glass is 12.5°C, condensation will form on the surface of the glass.

The rating recognizes three parts to a window: the centre-of-glass; the edge-of-glazing; and the frame. High conductive parts of the window are the least energy efficient, causing lower indoor surface temperatures and condensation. To reduce the potential, each component of the window should be thermally efficient. The CR is expressed as a number between 0 and 100. The higher the rating, the better it resists condensation formation.

How do you increase the condensation resistance?

To increase the resistance of windows to the formation of condensation, it is important to maintain the surface temperature of the window above the dew point.

Eurotech WinDoors reduce the potential for condensation by targeting areas of potential temperature variation:

Centre-of-glass & Edge-of-Glass by only manufacturing with high performance double glass options with a 16mm gap between panes. Further improved, by choosing energy-efficient, low-e or shading options.

Frame – By using low conducting timber frames instead of highly conductive metal framing.

Single glazing and aluminium-only frames are more likely to suffer from condensation. Fungal decay and rotting can be the result.