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20 Up-And-Comers To Follow In The Secondary Glazing Sash Windows Industry
Secondary Glazing For Sash Windows

Many homeowners are unable to build new double-glazed windows to their homes due to financial limitations or because they live in listed buildings that restrict any modifications to the exterior.

Secondary glazing is an excellent alternative to sash windows and can be installed several ways.

It is made up of an additional pane of glass inside the window frame, which prevents cold air from getting into your home, while also offering insulation and noise reduction.

Fixed Inserts

There are many different types of secondary glazing for sash windows. Each has its own set of benefits, from increased security to lower condensation. Which one is best for you?

The principle behind secondary glazing is to install an additional glass into your existing window frame. This creates an extra layer of insulation and soundproofing, which can greatly improve your home's energy efficiency.


It's not always practical to add double-glazed windows, especially if your home is an listed property or you are governed by strict planning regulations dictating what can and can't be done to your exterior.

In these instances secondary glazing is a fantastic alternative that can be installed with relative ease. It's also a popular choice for those who want to modernize their period property without the need to tear down the original windows with sash and replace them with contemporary ones.

There are many different options for secondary glazing on sash windows. Each one can be customized to fit the frame you already have. Proprietary systems usually have painted aluminium frames which are made to fit within the depth of a staff bead on an existing sash window meaning that shutters and sills are still able to be used.

They can be equipped with a variety of mounting methods such as glazing clips and Velcro. These offer a more aesthetic solution to screw-fixed units and are particularly suited to windows that aren't required to be opened frequently. You can also select a fixed lift-out device that can be easily lifted out and reinstalled to open your windows.

Horizontal Sliders

Horizontal Sliders provide excellent thermal insulation and are the most popular option for enhancing existing sash windows. They are also discreet and suitable for older homes, conservation areas & listed property. They can be fitted with the need for access from outside as they are operated from inside.

They can be operated by hand, and they can be left open or partially opened to allow ventilation. They are effective in preventing draughts, and they also filter harmful UV light. They can be used in combination with a flyscreen to keep out mosquitoes and other insects during summer months.

Trackglaze horizontal sliding systems give all the benefits of double glazing for the original window sash. It consists of PVC double sliding track that runs across all four sides of cavity and a simple brush seal around each sheet of glass and a finger pull angle handle to act as a hand and reduce bowing. It is available in kits of 1m or 2m track and angle that can be stacked together to create larger spans.

Secondary glazing can have a significant impact on noise reduction, specifically for rail, road and airport traffic. The addition of laminated or toughened glass further enhances the acoustic quality. repairmywindowsanddoors glazing that is standard reduces outside noise to 52dB (Rw) and specialist glass, like Stadip Silence Laminated Acoustic Glass, can achieve even more impressive levels of acoustic performance.

It can improve the energy efficiency of your home by keeping it warm for longer. This will decrease the use of central heating. It is much cheaper than replacing your original sash windows and can be installed in most cases without the need to remove the window or door frame.

Vertical Sliders

Secondary glazing is a cost effective option that is usually more manageable than full window replacement. It is also suitable for Listed Buildings & Conservation Areas. It's the ideal option to replace windows made of sash in Suffolk & Essex with modern insulation benefits while keeping the charm of older homes.

Vertical Sliders were specifically designed to be used in sash window applications in which hinged panels from the standard range would not be suitable. They have two secondary sashes that are secured, one above the other, within an outer frame and are supported by strong spring balances for ease of movement. The system can be installed on the inside of a window to provide better thermal performance or fitted with a space between the frame and the glass for optimum acoustic properties.

They can be equipped with a variety handles and stop strips to suit the homeowner's preferences and can be used to prop open the top or bottom pane to allow for ventilation or fixed in the closed position to provide security. They can also be fitted with an insulating bristle sealing device to keep out drafts.

'Choices’ Imagine vertical slider secondary glass has all the authentic wood detailing you'd expect to find in a window covering from the past. It is available in a variety of colours that match your existing sash. It is almost impossible to distinguish from the original sash windows, as details like sash horns and traditional butt joints are included in the design. It's available in an extensive selection of sizes and will accept glass up to 6.8mm to provide additional insulation against loss of heat. A tilt-in option is available that allows the individual sashes of the frame to hinge towards the back of safety stays to aid in cleaning.

Hinged Casement

Our single-pane hinged secondary glass can be incorporated into sash windows of any style, including traditional and casement sash. Our hinged units are manufactured with secure multi-point locking and are available with keys and a handle for the lock. This combination ensures the glazed panel is locked securely in place, and it pulls tight to the outer frame creating a seal designed to minimize heat loss. Hinged windows can be top-hung or side-hung and can be double-glazed. Our double-glazed windows provide enhanced sound insulation and are available in 43dB,47dB or 51dB.

Unlike horizontal sash windows, which have movable sashes, slide horizontally within the frame, casement windows can open outward and capture breezes from various angles. They can also be opened from the top and bottom for controlled ventilation. They also improve airflow and are a great alternative to traditional sash window.

They are typically used in modern homes because they offer small "sightlines" and unobstructed views. They can also be fitted into listed homes due to the fact that they don't require transoms or mullions. They're also a good option for those who live in areas that are difficult to reach since they can be opened with the twist of the handle.

The primary drawback to this kind of window is that it can block off large openings and limit the use of certain window treatments. They can be difficult to clean, as they open outward. They may also require regular maintenance and servicing.

Lift Out Windows

Secondary glazing can be put in place using a variety of ways. The cost of installation will vary according to the selection of materials, thickness, and type of glass. UPVC frames are the cheapest expensive, followed by aluminium and then wooden frames. Specialised glass can also increase the price and include additional features such as security or sound reduction.

Another aspect that can affect the cost is the complexity of the installation. The more complicated the installation is, the more time and labour will be required. This is also true for older homes with more intricate sash windows that require expertise and knowledge.

The best place to begin is by assessing the condition of your existing windows. The survey conducted by a skilled professional will give you a precise idea of what the costs could be.

In general, secondary glazing has little effect on the look of your home. Modern FINEO double-glazing is slim and distinct frame lines. This lets you improve thermal efficiency without sacrificing aesthetics.

The horizontal sliding secondary glazing is popular because it allows easy access to the sash window to clean or for ventilation. They also come with a tilt feature, which is activated by releasing the catch and raising the secondary glazing panel vertically up to a certain level. This is ideal for windows that don't open often and can be used to facilitate access for air conditioning in bay windows. You can use them to open the middle sash in a traditional sash Bay Window to create a symmetrical appearance.

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