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Secondary Glazing

Manufactured from slim, unobtrusive white enameled aluminium profiles usually with single glazing. Double glazing is also available for specialist applications. These units replicate the design of and are installed inside the main, or primary, window.


The product range includes;

• Vertical sliders for Sash Windows, with a tilting and removable sash facility for ease of cleaning
• Horizontal sliders with removable sashes for 'picture' type casement windows
• Hinged units for narrow casements, doors & French doors or windows. Sashes can be lifted off
• Lift out units for use when only occasional access is required to the primary main window
• Fixed units, usually only used to insulate glass panels within doors

Internal Secondary Glazing can be a cost effective solution if the main window is essentially sound and in good condition but there is a requirement to improve thermal and/or noise insulation.

Secondary Double Glazing is suitable for all Conservation Areas and (subject to listing detail) Listed Buildings.

If the main reason for considering Secondary Glazing is for sound insulation, please see further information below.

                                                       Noise Insulation

Where noise is a really serious nuisance, in areas of heavy traffic or close proximity to railways and for properties on flight paths, Secondary Double Glazing can be upgraded to provide a significant level of transmitted sound reduction.

This is achieved by using Stadip Silence ® laminated glass, with a special acoustic PVB interlayer which acts as a dampening core between the two panes of glass. This prevents vibration and eliminates the problems of critical frequency transmission and high frequency acoustic peaks.

The PVB interlayer is transparent and colourless, thus resembling normal glass.

It is impossible to give exact figures for noise reduction in a particular situation without instructing a Consulting Acoustic Engineer to attend site and take measurements. This is because each situation will depend upon the different types of noise, direction, distance, etc. This would not be cost effective in a normal domestic situation.

However, as a good 'rule of thumb', fitting Stadip ® secondary double glazing inside a single glazed window would more than halve road traffic noise.

Talk to Alpha Glass today for a great value quote for all your Secondary Glazing requirements. Click here to phone, fax or email us.