The Benefits of Secondary Glazing:
Secondary glazing is a great way to enjoy warmth, security and quietness of double glazing without replacing your existing windows.
Secondary glazing is one of the best ways to reduce noise and sound proof your windows, it can reduce external noise by around 75%. This can be enhanced further by specifying either Laminate glass or Stadip Acoustic Glass. Secondary glazing is ideal to reduce noise and draughts. Secondary is easy to fit, very affordable and being made from strong and slim aluminium will give many years of trouble-free service.
By installing an extra slim line window with a 100mm gap to existing windows, draughts can be reduced, and heat insulation improves. With secondary glazing, you can enjoy newfound warmth, security and comfort in your home. Made from slim and robust aluminium, this product is affordable and long lasting for many years.
Andover & Hampshire
Aluminium Secondary Glazing
Secondary glazing is particularly useful when replacement windows are not suitable for traditional, listed buildings, conservation areas or just properties which don’t need window replacements. The slim aluminium frames are strong and durable providing many years of service. We install and supply secondary glazing across Hampshire, Wiltshire, Dorset, Berkshire & Surrey.
Secondary glazing involves adding an extra slim-line window to the inside existing windows, KJM’s units are manufactured in England from strong lightweight aluminium, that can be directly fixed to the existing windows, or manufactured with a sub-frame to allow for either reveal fixed or face fixed. The wood used for the subframe is either MDF (medium density fibreboard), Luan (dark hardwood) or Tulip (pale hardwood).
The optimum gap to provide heat and noise reduction is 100mm between the secondary glazed unit and your existing window (glass to glass). However, this would normally mean that little or none of the internal cill would be left. Changing the thickness of the glass between your existing window and your new secondary glazing will change the frequencies of the sound wave length and reduce noise further. i.e. Existing window glass 4mm – install secondary glass 6mm.
Stadip Acoustic Glass for the Best Performance
Secondary Glazing Sound Insulation
The gap between the original window and the new secondary glazing is one of the most important things to consider regarding sound insulation. The most common size pane of glass in the original household glazing would typically be around 4mm, unless the property is pre 20th century, then it could be 3mm.
So if the original house glazing is 4mm and the secondary glazing is 4mm, the gap would need to be around 150mm between the original window and the new secondary glazing for optimal sound insulation. With 6mm glass in the secondary glazing this gap could be reduced to 100mm. If the reveal (or window cill depth) cant accommodate a 100mm gap then laminate or acoustic glass like Stadip should be considered for maximum sound insulation.
In comparison, Stadip Silence glass is a laminated product from Saint-Gobain. Laminated glass is a sandwich made of one piece of plastic Poly Vinyl Butyral (PVB) between two or more glasses. The PVB in Stadip glass is a special acoustic interlayer – PVB Silence®. This layer acts like a dampening core between the two panes of glass. It prevents vibration, eliminating the problem of the critical frequency and thus the acoustic peaks at high frequencies.
Andover & Hampshire
To what extent does secondary glazing reduce sound pollution in the home?
Aluminium secondary glazing improves both your heat & sound insulation to your existing windows. Adding acoustic glass can improve the sound reduction even further. To achieve up to an 80% acoustic performance KJM recommend the specification of acoustic glass and an air cavity no less than 150mm – 200mm glass to glass.
We install secondary glazing across Berkshire, Dorset, Wiltshire, Surrey and surrounding areas.
Secondary Glazing Options
Secondary glazing is one of the best ways to reduce noise and sound proof your windows, it can reduce external noise by around 75%. This can be enhanced further by specifying either laminate glass or Stadip Acoustic Glass. Draught proofing is the other most common reason to install secondary glazing.
For even better thermal performance, security and sound reduction, you can specify Pilkington K Low-e glass and fly-screens into our secondary glazed systems which retains the exterior look/character of the property.
The most common systems manufactured are sliding units, that can be either horizontal or vertical. However tilt back vertical sliders, hinged units, lift out units or fixed units are available. We have an installed example of our secondary glazing (three pane horizontal slider), in Andover, Hampshire.
Butt Hinged and Lift Out Secondary Glazing
Butt hinged secondary glazing comes as either a single or double panelled unit. The butt hinges give a large clear opening which allows for easy maintenance and cleaning, as they are made from slim and strong aluminium. The butt hinges allow for the secondary unit to open fully from their side hung position, but our friction hinged secondary glazing is available in both top and side hung styles.
Alternatively, the secondary glazing standard lift-out is a removable secondary glazing panel within its own outer frame that is fixed to the face or reveal of the existing primary window. The integral finger lift bar at the bottom of the panel allows it to be lifted up into the top of the secondary window outer frame and then swung inwards to facilitate removal.
Tilt Back Balanced Vertical or Horizontal Sliding
Designed to match existing sash windows, our tilt back balanced vertical sliding secondary glazing is one of our most popular secondary glazing products. They reduce noise, cut heat loss, are easy to fit and are very affordable. Our vertical sliders are made from slim and strong aluminium. As the panels are balanced, they reduce the effort required to slide the panels up and down and remain in position at whatever height you leave them. By operating finger latches the panels can be tilted inwards for easy cleaning.
Our horizontal sliding secondary glazing is extremely versatile, slides smoothly and available with two to five panels. Horizontal sliders are perfect for sound and thermal insulation for casement windows, hinged windows, or any window that has vertical bars. Panels slide within the frame allowing easy access to the existing outer windows, providing ventilation without interfering with curtains or blinds.
Secondary Glazing Prices Andover & Hampshire
Thinking about secondary glazing? Secondary Glazing prices?
Secondary glazing costs much less than new windows, the installation is easier, there is less mess and it is much quicker.
Quoting is easy, all we need is a photograph of the existing window and some sizes. We can advise and price for you without a home visit. Contact us today for a secondary glazing quote.
Secondary Glazing FAQ's
To what extent does secondary glazing reduce sound pollution in the home?
Secondary glazing correctly specified and installed will acoustically outperform all other types of glazing, including new windows and even triple glazed ones. Installing good secondary glazing really is the best option. To achieve up to an 80% acoustic performance, KJM recommend the specification of acoustic glass and an air cavity no less than 150mm – 200mm glass to glass.
Is secondary glazing as good as double glazing?
Secondary glazing is an absolute winner, if sound insulation is your ultimate goal. It provides much better levels of acoustic insulation than double glazing, this is because you can create a much larger gap or cavity between the panes of glass. This offers a far better sound dampening effect than double glazing as most double glazed units only have a 16mm or 20mm gap. If the quality of your primary window is poor then the correct starting point is for repair or replacement, adding secondary as well can reduce sound levels by as much as 70 to 80%. It is an easy way to introduce three different thicknesses of glass, the ultimate way to improve sound insulation.
Double or even triple glazing offers better thermal performance than secondary glazing. Finally if you live in a listed building then secondary glazing may be your only option for both heat and sound insulation.
How much does secondary glazing cost?
Secondary glazing costs have varied over the past few years but remain competitive. There are variables that affect the costs. These include: size of the window, opening style, glass choice, heavy duty or budget systems with slimmer profiles and installed cost or supply only.
Quoting is easy, all we need is a photograph of the existing window and some sizes. We can advise and price for you without a home visit.
What is secondary glazing?
Some people say secondary double glazing is adding a second window to your existing window. If the original windows are single glazed then adding a second pane could be described as double glazing, so is it triple glazed if the original window is already double glazed? You can get secondary double glazed units, but these are expensive and in most peoples minds not worthwhile.
What does secondary glazing look like?
Secondary glazing sits on your internal window cill, simply put, it is panes of glass that are in an aluminium frame fixed to your window reveals or the inside face of your window frame. The first scenario is ‘reveal fixed’ the second ‘face fixed.’ The units can be sliding, hinged or lift out. There is a photo of a typical three pane slider at the top of this page. A secondary glazed window means leaving the existing primary window in place and adding a second window.
Does secondary glazing add value?
Most estate agents would agree that the addition of secondary glazing will add value to your home. However how can this value be quantified? If you have installed secondary glazing to reduce the noise in the home then this value will be noticed when trying to work or sleep in your home and would be a great selling point. Potential purchasers will hear the noise if you don’t have sound reducing glazing and may be put off buying your home. The added benefit of heat insulation will also save on both heating and cooling bills, particularly important if the existing windows are only single glazed.