Blown Double Glazing

Do I need to replace the window frames as well?

In most cases, you won’t need to replace your frames to fix your failed double glazing! Replacement double glazed units are a much cheaper alternative to installing new windows. A misted-up window is due to the seal on the glass, which has nothing to do with the frame itself. As long as the frame is in good condition, you simply need to replace the glass unit inside. When performing double glazing repairs, it is a great opportunity to upgrade the glass to A-rated energy-efficient glass to get better insulation and lower your heating bills.

What causes condensation on the outside of the double-glazed unit?

Condensation on the room-facing side of your double glazing means there is a ventilation problem within that particular room that needs addressing. Condensation can appear on the inside of the units when clothes are being dried in a room when it is cold and wet outside.

Condensation on the exterior means the double glazed unit is performing exactly as it should and you will notice it disappear throughout the day as the sun rises. 

This phenomenon is a natural occurrence and not a fault with the glass or the window. This does not mean your double-glazed window has failed. The situation occurs mainly in Spring and Autumn, when the glass temperature falls to a low level at night, with the moisture of a heavy morning dew condensing against the cold surface of the glass.