Secondary glazing is a fully independent window system installed to the room side of existing windows.
The original windows remain in position and in their original unaltered form. Secondary glazing is available as open-able, removable or fixed units. The open-able panels can be either side hung casements or horizontal or vertical sliding sashes. These allow access to the external window for cleaning and the opening of both the secondary glazing and external windows for ventilation. Fixed forms of secondary glazing are designed to be removed in warmer months when the thermal benefits are not required.
Secondary glazing is nothing new. In the 19th century some buildings were constructed with internal secondary glazing incorporated as part of the original design. Often a second double hung sash window or solid panels with counterbalancing weights were fitted in the space below the window. Their function was to cut down the heat loss and provide some measure of acoustic insulation to the window opening.
The original windows remain in position and in their original unaltered form. Secondary glazing is available as open-able, removable or fixed units. The open-able panels can be either side hung casements or horizontal or vertical sliding sashes. These allow access to the external window for cleaning and the opening of both the secondary glazing and external windows for ventilation. Fixed forms of secondary glazing are designed to be removed in warmer months when the thermal benefits are not required.
Secondary glazing is nothing new. In the 19th century some buildings were constructed with internal secondary glazing incorporated as part of the original design. Often a second double hung sash window or solid panels with counterbalancing weights were fitted in the space below the window. Their function was to cut down the heat loss and provide some measure of acoustic insulation to the window opening.
Nowadays, secondary glazing is fitted to listed buildings, properties in conservation areas or simply where the existing windows would be too costly to replace or where the removal of the existing windows would spoil the appearance of the property.