Horizontal sliders provide easy access for cleaning and ventilation, they are suitable for treating most window types. Available with 2, 3, 4 or 5 sliding sashes (panels).
What is Horizontal Sliding Secondary Glazing?
Horizontal sliding secondary glazing is extremely popular due to it being multi-functional and a perfect fit for all property types and styles. Whether you own a period property, listed building or a character cottage, our secondary glazing solutions will complement them all. It is the most commonly used type of secondary glazing and ensures high levels of security whilst achieving durability and a long-lasting lifespan. It is particularly useful when replacement windows are not needed or if your home is within a conservation area as they offer a discreet and subtle upgrade.
Our horizontal sliders are an ideal choice for high rise and low level commercial and residential properties as well as heritage homes. The versatile nature of the secondary glazing solution makes it a cost-effective and worthwhile investment. It is an affordable home improvement solution which you’ll be able to enjoy for years to come.
From Two To Five Horizontal Slider Panels
Clear Benefits of Horizontal Sliders
65% reduced heat loss
Using 4mm toughened Low E glazing, with 80mm glass-to-glass optimum U Value: 1.868 W/m2K.
80% noise reduction
Using 6.4mm acoustic laminate glazing, with 200mm glass-to-glass optimum Noise Reduction: 52dB (Rw).
What are the Benefits of Horizontal Sliding Secondary Glazing?
Create a Peaceful, Warm and Secure Home
Adding horizontal sliding secondary glazing to your home will mean that you benefit from increased insulation, excellent sound reduction and more. They can be added to a range of windows such as casement, hinged or any window that has vertical bars. We can discuss your exact requirements and specifications, coming up with the best way to install secondary glazing to your home.
Available in a wide range of sizes with a choice of configurations to tailor your horizontal sliding secondary glazing to your needs, you’ll find that we can create the perfect fit. Available in two, three, four or give panels, the sashes can be completely removed when you need to clean and maintain the existing window. Because the sashes are fitted with brass rollers, it ensures a smooth sliding action making them easy to use. You won’t have to worry about spending time or money on their upkeep, simply give the windows a wipe down from time to time to keep them in optimum condition.
Discreet, Slimline and Unobtrusive Design
Our horizontal sliding secondary glazing allows easy access to the primary windows for ventilation and each individual secondary glazing panel can be lifted up into the top of the outer frame and then swung inwards to facilitate removal. This allows access for cleaning and maintenance.
Horizontal sliding secondary glazing has been proven to eliminate draughts, increase thermal efficiency and improve the security of your home. You can add further hardware accessories and options such as specific locks and handles to increase the security further. Our horizontal sliding secondary glazing results in a warm, secure and quiet double glazing solution that will make all the difference.
Our horizontal sliding secondary glazing can help you to achieve thermal efficiency in your home, making it warmer for longer. This means your home will remain at a consistent and comfortable temperature reducing your reliance on central heating and helping to keep your energy costs low. This in turn decreases your carbon footprint, making it an eco-friendly upgrade and helping you contribute to a greener environment.
Keep the Weather and Noise Outside
When you fit horizontal sliding secondary glazing you’ll find that you no longer suffer with condensation issues which is usually the cause of mould and mildew. Secondary glazing keeps moisture out keeping your home warm and dry. The weathertight seals mean that your windows can withstand even the most adverse weather conditions that we often get in the UK.
You can enjoy peace and quiet when you add horizontal sliding secondary glazing due to the sound insulation that it provides. Proven to reduce outside sounds from traffic, airports, schools, built up areas and more, you’ll find your home is a more serene place to be no matter where you live. You can enjoy tranquillity in every room of your home.
Secondary glazing increases your homes security, creating an obstacle for intruders and making it incredibly difficult to break-in. This gives you the peace of mind you need when it comes to your family and home being safe.
Features & Options of our Secondary Glazing
5 Year Warranty
All windows come with a five-year warranty on frames and glazing.
Our local partners can deliver and install at your convenience.
Choose From 200 Colours
Aluminium frames can be finished in the full range of RAL colours.
Bespoke Range of Glass
Glazing can be specified from 4 - 8.8mm, to meet thermal and acoustic demands.
Simple to Maintain
Cleaning and maintenance is made simple with easy to lift out panels.
Windows can be face-fixed or reveal-fixed, to suit your preference.
What is Secondary Glazing?
Secondary glazing is a discreet window that is installed to the interior side of the room. Available in different styles to suit all window types, secondary glazing will decrease noise levels breaching your primary windows and increase thermal efficiency. As it doesn’t change the fabric of the building, secondary glazing can be installed within Conservation areas and Grade I and Grade II Listed Buildings. All of Granada’s products are manufactured from durable aluminium and can be powder coated in over 200 RAL colours. Secondary glazing is often installed to combat two main issues; Acoustic and Thermal performance. No other form of glazing can reduce noise levels by up to 80% (which is the equivalent of 54 dB). Another benefit of secondary glazing is that it offers an increased level of security. If your primary windows are forced open, secondary glazing acts as a second barrier as it can’t be opened from the outside. All of Granada’s products are manufactured in durable aluminium and are powder coated in-house, which allows them to stand the test of time. Often used in conjunction with single, double, and triple glazed uPVC or timber windows. Secondary glazing boasts a unique performance that is unmatched by any other window system.
Does Secondary Glazing Work?
Yes! Your home will benefit from excellent levels of thermal efficiency and noise reduction when you install our Secondary Glazing. It also acts as a second barrier against unwanted intruders, helping to keep your home safe and secure!
What are the types of Secondary Glazing?
There are six main types of secondary glazing! Lift out Units - Used when the primary window is fixed, or when the primary window is required to open for ventilation. Hinged Units - These units are used with casement or hinged primary windows. Vertical Sliders - The perfect addition to vertical sliding sashes. Meaning the meeting rails align with the primary window meeting rail. Horizontal Sliders - Used in conjunction with casement or sash primary windows. That requires full access and where the casement window has sufficient space internally to open the secondary glazing. Bespoke - Ideal for more traditional properties, secondary glazing can be installed to unique primary windows. Fixed - Used for an independent window that is fitted internally.
How effective is Secondary Glazing?
Secondary Glazing can be a very effective way of enhancing thermal efficiency, security, and noise reduction in your home! The second window acts as a barrier between your home and the outside world.
Can you add Secondary Glazing to existing windows?
Yes! The whole design of Secondary Glazing is that it sits in the same window frame as your existing window. The perfect solution to get all the benefits of double glazing without replacing your existing windows!
How does Secondary Glazing work?
When installed, Secondary Glazed windows sit inside the same window frame as your existing window. This acts as a second barrier between your home and the outside helping to improve your homes thermal efficiency, security and reduced noise pollution.
Why choose Secondary Glazing?
Secondary Glazing is an excellent way of improving the overall performance of your home! It is also a cheaper option than installing double glazing into your home. You can also get Secondary Glazing installed when you live in Listed Buildings and Conservation areas too!
Which Glass Type Should I Choose?
Secondary glazing is usually specified to combat two main issues; acoustic or thermal performance. In conjunction with the air cavity, the type of glass specified plays a vital role in rectifying your problem. As standard, all of our products are manufactured with 4mm toughened glass for enhanced security and safety. (Please be aware that other secondary glazing providers may supply float glass which is brittle and can be easily broken. If broken, it can leave large dangerous shards, often resulting in injury). Here at Granada, we provide several types of glass, ranging from different thicknesses to different coatings. Each type of glass has specifically been designed and selected to offer optimum performance. Sound – Selecting the correct glass and installing the secondary glazed unit with an air cavity of 150mm to 200mm, can drastically reduce noise issues by up to 80% (54 dB). Most traffic noise problems can be rectified with the installation of either 6.4mm or 6.8mm clear acoustic glass. Where noise is a real nuisance, and loud, we suggest the specification of 8.8mm clear acoustic glass. Thermal – Cold draughts breaching your primary windows can make a room feel uncomfortable and makes it uneconomical as the loss of heat will result in higher energy costs. Where thermal performance is required, we advise the installation of either 4mm, 6mm or 8.8mm clear laminate low E glass. Low E glass has a specially designed coating that reflects heat waves into the room, thus keeping your it warm in the winter, and cool in the summer. The type of glass specified can increase or decrease your quoted price. It is best practice to speak with us directly as you may over-specify the glass type. We can provide a tailored solution to rectify your issue, which is both cost-efficient and practical for your specific requirements.
What is the Installation Process for Secondary Glazing?
Secondary glazing is installed to the interior side of the room creating little to no mess. Often installations can be completed within 1 hour. We work closely with over 500 national trade installers who will make an appointment to measure and install at your convenience.
What Materials are used for the Frames?
As market leaders within the glazing industry, it is essential that our secondary glazing is high performing and aesthetically pleasing. The key to our approach is to use the best raw materials available and manufacture to the highest standard possible. All of our frames are manufactured in house from slimline, durable aluminium. We cut, powder coat, arch and fabricate our aluminium frames in-house under one roof. Utilising high tech machinery such as CNC machines, we can ensure all frames are built to size as sealed units. Our knowledge, expertise and skills in manufacturing ensure high quality and the best performing product. Our competitors have tried to reduce the amount of aluminium within the frames to reduce the cost of raw materials, but we found this has a negative effect on product quality. Reducing the amount of aluminium does decrease the value. The implications of this make frames and sashes unstable and unable to take the weight of the glass, creating health and safety issues. This also decreases the acoustic and thermal performance of the product. Granada’s head office holds a team of product developers where they can often be found designing and manufacturing glazing products using new materials and manufacturing techniques. All of our products are quality tested before they leave our facility, ensuring a high level of quality and function.
Will I Lose the Functionality of my Windows?
Granada secondary glazing is available in many styles complimenting all window types. We have a range of windows that slide horizontally and vertically for easy access and cleaning. Our hinged unit operates on a hinge mechanism that can be placed on the side of the window for conventional opening or on the top or bottom dependent upon your requirements. Other window styles include fixed windows or lift outs which can easily be lifted out of the frame.
What is the Difference Between Secondary Glazing and Double Glazing?
Double Glazing is made from two panes of glass which is separated by a sealed air gap, usually filled with a gas like argon, which helps to improve the thermal insulation, sound reduction and overall performance of your home. This helps to improve energy ratings and reductions in carbon dioxide emissions. Building Regulations make double glazing a very recommended, and normally compulsory addition to any new home. Secondary Glazing is an excellent way of improving the overall performance of your home, without the cost of Double Glazing. You can benefit from improved thermal efficiency, security, reduction in noise pollution and energy ratings when you choose to install Secondary Glazing. This is also the best way to improve the performance of older, Listed Buildings or building in Conservation Areas.
What are the Advantages of Secondary Glazing?
There are many benefits to secondary glazing! This type of glazing offers the most effective sound insulation, reducing noise levels by up to 80%. Secondary glazing also improves heat insulation and reduces heat loss through the window by around 65%. Secondary glazing is an excellent value for money, not only does improve home insulation but increases the security of your home at the same time.
How Do I Clean my Windows with Secondary Glazing?
To reduce the risk of damaging your secondary glazed windows, here are some useful tips to keep your windows clean and smudge-free! Don't use abrasive cleaning products such as acids or alkalines. Stay away from steel wool or wired scourer pads when cleaning your windows. Make sure to vacuum the bottom track of the horizontal sliding system to avoid dirt build-up.
Does the Secondary Glazing Installation Affect the Existing Window?
No, however, we always use a different thickness of glass in your secondary glazing compared to your existing windows as this will decrease sound reverberation.
Will I Need to Redecorate After my Secondary Glazing is Installed?
No, you won't need to redecorate after secondary glazing is installed! At Granada, our exceptional knowledge allows us to carefully and precisely fit your windows in around 1 hour. Our FENSA approved installers add an extra layer of protection.
How is Secondary Glazing Installed?
Secondary glazing is installed to the interior side of the room, creating little to no mess, and often installations can be completed within 1 hour. Secondary glazing can be installed within the reveal of the window or can be fixed to the face of the primary window, dependent upon the application. To achieve a neat finish, we supply PVC trims as standard, which you can scribe in. To view video tutorials on how to install secondary glazing, please click here.
How do I Measure my windows?
Before you measure your window for the installation of secondary glazing, standard practice is to select a design that compliments your existing primary window. The key is to choose a design that does not add additional site lines and can give you access to your primary window for maintenance, cleaning and ventilation. We ask that all measurements are given in mm and are formatted width x height. Please click here to view a short video which covers all aspects of measuring your windows.
How do I look after Secondary Glazing?
Granada’s secondary glazing is manufactured from aluminium and is powder-coated to give a durable and aesthetically-pleasing finish. From time to time, you may need to wipe the aluminium with a damp cloth to de-dust. Cleaning the glass is no different than any other glass product. As our products are manufactured from high-quality aluminium, they are self-sustaining, giving many years of trouble-free service. In the unlikely event of a malfunction, please speak with either the tradesman who installed the secondary glazing or talk with our after-sales care team who you can contact on 01909 499 899.
What Depth of Air Gap is Best for my Windows?
The installation of secondary glazing boasts many unique benefits. One of these benefits includes an 80% reduction in sound (54 dB) and a 65% decrease in heat loss. The installation of secondary glazing requires a small air cavity which acts as insulation between your primary windows and the secondary glazing. The air cavity plays a vital role when reducing noise levels or increasing thermal efficiency. (We advise a different air cavity based upon the issue you are trying to cure.) Sound – We advise an air cavity of between 150mm to 200mm. This type of installation is referred to as reveal fix. The secondary glazing unit is installed within the window reveal and can reduce noise levels by up to 80% (54 dB). For optimum performance, Granada recommends the specification of clear acoustic glass which is available in thicknesses of 6.4mm, 6.8mm and 8.8mm. Thermal – To achieve optimum thermal efficiency, we recommend an air cavity of up to 80mm. This type of installation is commonly known as face fixing as the secondary glazed unit is fixed to the internal face of your primary window. Specified with a Low E glass correctly installed secondary glazing can reduce heat loss by up to 65%. Please speak with Granada directly, where we will be able to recommend a solution, tailored to your requirements.
Does Secondary Glazing Enhance the Security of my Home?
As secondary glazing can’t be opened from the outside, it adds an extra barrier to forced entry. If an intruder forces or breaks the glass of your primary windows, they will have to try and force the secondary glazing to gain access to your property. Secondary glazing is a popular choice for homeowners who live in a conservation area or Grade I and Grade II listed buildings. Secondary glazing can be installed without planning permission and prevent the issues old windows have which can’t be changed. Historic England recommends the installation of secondary glazing as it does not change the original fabric of the building. For homeowners that can change their original timber windows but don’t want to lose the character of their property, secondary glazing which is discreet in style and design is an option which is often specified.
What is the Benefit of the Subframe?
All of Granada glazing’s products are manufactured and supplied with a timber subframe (please note: insert panels are not supplied with a subframe). As standard, the wooden subframe and aluminium window frame are pre-drilled and countersunk for ease of installation. The hardwood subframe which surrounds the secondary glazing unit increases the rigidity of the whole window, aiding installation. As aluminium is a great heat conductor, the wooden subframe acts as a thermal barrier which prevents cold bridging from the fabric of the building onto the aluminium. In turn, this can help reduce condensation, as the temperature of the building fabric does not cool the temperature of the aluminium frame and glass. As standard, (on most products) we supply aluminium secondary glazing with a subframe, pre-drilled and countersunk. As we manufacture in-house, we can provide secondary glazing to your specification. Please advise at the point of quotation if you do not require a subframe or pre-drilled units.
How does Secondary Glazing Increase Security?
As secondary glazing can’t be opened from the outside, it adds an extra safety barrier to forced entry. If an intruder forces or breaks the glass of your primary windows, they will have to try and force the secondary glazing to gain access to your property. All of our secondary glazed products are manufactured from durable aluminium where toughened, security glasses are available to offer extra protection.
Does Granada Install Secondary Glazing?
Granada Glazing designs and manufactures bespoke aluminium secondary glazing. Our products are widely used within both homeowner and commercial markets. We have partnered with over 500 industry-leading tradespeople who install our products for homeowners. Our elite trade network installs secondary glazing products throughout the whole of the UK. We often receive homeowner/residential orders where these are passed to a local tradesman who will survey and install our products. Our approved trade network is trained to the highest standards and adhere to Granada’s customer care guidelines. At Granada, we pride ourselves on the quality of our product, which is matched by high levels of service given by both our approved tradesman and our internal sales team. Since 1984 Granada Glazing has been the industry leader. We offer technical support and can recommend a product that is suitable for most budget requirements, performance and functionality. For technical support, or help with selecting the right product to cure your noise or thermal issue, please speak with us directly by telephoning 01909 499 899, or click here to email our internal technical support team. For commercial installations, Granada has an in house surveying and installation team. We have designed, manufactured and installed secondary glazing within some of the most iconic buildings situated in England, Scotland, Wales and Ireland. Notable projects include: • Bush House – London • Edinburgh Castle – Scotland • Stirling Castle – Scotland • Parkinson Building – Leeds • Gradbach Mill – Derbyshire • Great Northern Hotel – London
Are there any Guarantees or Warranties?
In the unlikely event of a malfunction, our secondary glazing is backed up with a five-year warranty on frames and glazing; and a two-year warranty no moving parts. The majority of our elite trade network are members of FENSA. FENSA is a governing body where tradespeople and installers can self certify that their installations comply with current building regulations. In the unfortunate event of a malfunction, please speak with our customer care team by telephoning 01909 499 899.
Will Secondary Glazing work with Double and Triple Glazing?
Secondary glazing can be used in conjunction with all types of windows. Traditionally, secondary glazing was utilised to increase the thermal properties of single glazed timber windows. Modern advancements in specific glass types and frame material have given secondary glazing a new lease of life. Its acoustic performance is unmatched by any other glazing product and can drastically reduce noise breaching single, double and even triple glazing. If you live in an area with high noise pollution, only secondary glazing will reduce noise levels by up to 54 dB, turning the sound of a diesel bus into a whisper. Manufactured from durable aluminium, Granada’s secondary glazing is slimline and can be powder coated in over 200 RAL colours to suit all tastes and preferences. Slimline by nature and durable by design, Granada’s secondary glazing will enhance the thermal and acoustic performance of your windows, while standing the test of time.
Can you Choose the Colours of Secondary Glazing?
Our Secondary Glazing comes in a range of bespoke and RAL colours. This means our Secondary Glazing can be the perfect addition, which can suit your home perfectly.
What Colours are the Secondary Glazing frames available in?
You can choose from a range of RAL colours, and bespoke colours when you choose our Secondary Glazing! This means we guarantee we have the perfect addition for your home!
What Colours are the Frames Available in?
Our products are manufactured from durable aluminium and powder coated in house. Our standard, and most popular colour is Standard White with a high gloss finish. In addition to standard white, we hold stock colours which include: Van Dyke Brown (BS08B29, Gloss) Cream (RAL9001, Satin) Grey (RAL7016, Satin) Ivory (RAL1015, Satin) Black (RAL9005, Satin) Traffic White (RAL9016, Matt) Pure White (RAL9010, Satin) To offer our customers short lead times Granada purchased a powder coating line allowing us to finish all products in house. This investment has given our customers a level of customisation as we can powder coat frames in over 200 RAL Colours to suit all taste and preferences.
Can you use Secondary Glazing for Crittall Windows?
Crittall Windows are especially well-served by Secondary Glazing. Adding Secondary Glazing can help to tackle draughts and energy inefficiency which are often associated with Crittall style Windows.
Can you use Secondary Glazing for Leaded Windows?
Yes! Secondary Glazing is an excellent option to improve the performance of your existing windows. It is cheaper than getting replacement windows for your existing ones, and when they are installed to a high standard, you can improve the overall energy efficiency of your home too!
Can you have Secondary Glazing for Bow Windows?
Secondary Glazing can be fitted to the internal of any window in your home, including Bow windows! Even with the curving of a Bow window, you can install Secondary Glazing to help improve the performance of your home. This is possible because our Secondary Glazing is fitted as a separate, secondary unit to your existing window.
What is the Difference Between Face Fix and Reveal Fix?
Secondary glazing is installed by either reveal fixing or face fixing each installation type will increase either acoustic or thermal performance. Reveal Fix – To achieve the optimum acoustic performance, we recommend acoustic glass where the secondary glazed unit is installed with a 150mm to 200mm air cavity glass to glass. The secondary glazed unit is installed within the window reveal enhancing acoustic performance by up to 80% (54 dB). Face Fix – Face fixing is recommended to increase thermal performance. The secondary glazed unit should be installed no more than 80mm away from the primary window. It is installed to the internal face of the primary window, and when taking advantage of Low E glass, customers often see up to a 65% decrease in heat loss.
I have Windows in Varying Sizes and Shapes, is Secondary Appropriate?
Granada’s secondary glazed units are manufactured to order in bespoke sizes and colours. We can bend/arch frames in-house to suit any window size, shape or style. As our products are made to order, we can manufacture units that match both transoms and mullions to reduce sightlines and make the secondary glazing even more discreet. For larger windows, typically commercial applications, we can stack or couple single units to achieve the required coverage.
Which Glass Type Should I Choose for my Secondary Glazing?
Secondary glazing is usually specified to combat two main issues; acoustic or thermal performance. In conjunction with the air cavity, the type of glass specified plays a vital role in rectifying your problem. As standard, all of our products are manufactured with 4mm toughened glass for enhanced security and safety. (Please be aware that other secondary glazing providers may supply float glass which is brittle and can be easily broken. If broken, it can leave large dangerous shards, often resulting in injury). Here at Granada, we provide several types of glass, ranging from different thicknesses to different coatings. Each type of glass has specifically been designed and selected for optimum performance. Sound – Selecting the correct glass and installing the secondary glazed unit with an air cavity of 150mm to 200mm, can drastically reduce noise issues by up to 80% (54 dB). Most traffic noise problems can be rectified with the installation of either 6.4mm or 6.8mm clear acoustic glass. Where noise is a real nuisance, and loud in nature, we suggest the specification of 8.8mm clear acoustic glass. Thermal – Cold draughts breaching your primary windows can make a room feel uncomfortable and makes it uneconomical as the loss of heat will result in higher energy costs. Where thermal performance is required, we advise the installation of either 4mm, 6mm or 8.8mm clear laminate low E glass. Low E glass has a specifically designed coating that reflects heat waves back into the room, thus keeping your it warm in the winter, and cool in the summer. The type of glass specified can increase or decrease your quoted price. It is best practice to speak with us directly as you may over-specify the glass type. Some of our customers and commercial clients specify the highest performing glass, which in turn adds cost. Often we can provide a tailored solution to rectify your issue, which is both cost-efficient and practical for your specific requirements.
A Sympathetic Range of Two Styles
Our bespoke products support the sympathetic treatment of all window styles. As windows vary in sizes, we have two ranges: Traditional and Heritage. Both styles offer optimum acoustic and thermal performance, the main difference is the thickness of the aluminium profile.
Traditional range of Horizontal Sliders: offers minimal sightlines and is requested more often, it is suitable for most homes and commercial properties.
Heritage range of Horizontal Sliders: utilises a slightly thicker aluminium profile suitable for larger windows.
Sizes for each range can be seen below, please speak with our friendly customer care team to understand which style is best for your property.
Really impressed with the speed and quality of the work. It has made a huge difference to the house.
July 20, 2016
Windows look great, have made a big difference, very polished.
June 24, 2016
Complete process from quote to installation was very smooth. Appointments were always kept on time and goods were supplied as specified. A very professional company fashion.