Blown double glazing is when the seal of the doubled glazed unit is damaged. A double glazing unit typically has 2 panes of glass with a thermally efficient spacer bar between them. The panes of glass are sealed together using a hot melt adhesive.
A blown double glazing unit is one that allows moisture between the 2 double glazed panes of glass. As the seal is damaged, it is thus no longer a sealed unit and will not function as it should by keeping the cold air out and the warm air inside the building.
Damage to the seal can occur due to age, normal wear and tear and how the unit was originally installed. In addition, it can also occur as a result of a chemical cleaning agent used on the glass, causing damage to the seal over time.
Blown double glazing repair is possible. Buildings with modern energy-rated aluminium or UPVC double glazing are easy to do. However, buildings with old fenestration systems, or with those manufactured with timber frames are a little more complicated. This is especially true if the glass was attached with putty instead of beading.
At Steamy windows, we provide expert blown double glazing repair. In most cases, it is the seal of the unit that needs replacing and not the entire unit. The new energy efficient glass that is used is properly installed with a new seal.