Secondary Glazing


Although secondary glazing has many benefits, its main use is for noise control in extreme environments, for example, near busy roads or airports. The key to selecting secondary glazing is to choose a product that suits the property owner’s need but has the lowest visual impact when installed into a traditional timber window. There are four main configurations of secondary glazing:
1.Lift out units
The lift out units are used where the primary window is fixed or where a customer seldom requires access to open the window for ventilation.
2.Hinged Units
These hinged units are generally used with casement or hinged primary windows.
3.Vertical Sliders
These vertical slider units are normally used on vertical sliding sashes with the meeting rails aligning with the primary window meeting rail.
4.Horizontal Sliders
The horizontal slider units are generally used in conjunction with either sash or casement windows where full access is required and where there is sufficient space internally to open the casement secondary glazing.

To achieve a higher acoustic performance, a minimum gap of 100mm should be achieved between the primary window glazing and the secondary glazing. The optimum desirable gap is 150mm. The installation method will depend upon the depth of the primary window reveal. If the reveal is insufficient to achieve the minimum 100mm gap, then the window will require boxing out to the required depth. Ventrolla's Surveyors will advise on this and any other issues at the time of survey.


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Established for over 30 years, period window specialists, Ventrolla, provide a unique renovation and upgrade service to improve the energy and operational performance of traditional timber windows. Their services include draught-proofing, repair and...
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 Ventrolla House, Crimple Court, Hornbeam Business Park, Harrogate, N Yorkshire, HG2 8PB

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