Secondary Glazing

Granada Secondary Glazing

Granada Secondary Glazing is on display in our Abergavenny Window and Door Studio

Reduce Noise Levels by up to 80% & Heat Loss by up to 65%

Granada Secondary Glazing Sound Proofing Performance

Granada Secondary Glazing Weather Performance

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Granada’s Secondary Glazing is Discreet, Durable and Functional. Secondary glazing is a stylish and cost effective way of increasing both acoustic and thermal performance.

Homeowners install secondary glazing to combat 2 main issues, acoustic and thermal performance. The installation of secondary glazing boasts a great number of benefits and can be installed within all house types even Grade I and Grade II listed buildings. Our customers receive an 80% reduction in noise breaching the primary window and up to 65% reduction in heat loss.

Secondary glazing is often used in conjunction with single, double, and triple glazed uPVC or timber windows. Our products are manufactured in house at our 40,000 square feet manufacturing facility.

As our products are powder coated and manufactured all at one location by Granada Secondary Glazing, so we can ensure total quality, short lead times and the highest performing product available

Made from durable aluminium and available in over 200 RAL colours our systems are discreet, functional and come with a 5 year warranty on frames and glazing and a 2 year warranty on moving parts.

The installation of secondary glazing within conservation areas is advised by Historic England as the installation does not change the original fabric of the building

Granada Secondary Glazing Shaped Gable Units

Window Styles

Horizontal Sliders

Horizontal sliding windows are versatile and provide easy access to the outer window. The sashes slide within the frame, so few problems are encountered with blinds, curtains or ceiling bulkheads. Individual windows can be linked with mullions and transoms — allowing large and ribbon windows to be treated

Vertical Sliders

Vertical sliding units are ideal for treating traditional sash windows. Spring balances support the weight of the sash in all positions

Hinged Casement

Hinged units allow full and easy access to the outer window (or door). With no transoms or mullions to impede the view, these unobtrusive systems also provide increased levels of security

Lift Out Windows

Lift out units offer a practical solution for treating specialist windows which require access for cleaning or maintenance

Fixed Windows

Insert panels are generally combined with other window styles to provide side lights or over lights, particularly in the treatment of arched windows. They are also used within partition walls as observation windows for laboratories, control rooms, clean rooms and recording studios.

Granada Secondary Glazing Shaped and Arched Windows

Bespoke Design

We can create individually shaped windows in secondary glazing to suite most types of traditional window design

Benefits of Secondary Glazing

Sound Insulation

Secondary glazing offers the most effective sound insulation – significantly outperforming double glazing. From noisy roads to noisy kids, our windows can reduce noise levels by up to 80%

Thermal Insulation

Substantially improves the thermal insulation of existing single-glazed windows – reduces heat loss through the window by around 65% – around 10% more than double glazing

Increased Security

Secondary windows offer an affordable, discreet, highly effective solution to enhancing building security. No external access is required, ideal for multi-storey buildings.

Value

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Retain Character

As the Granada range is slim line and discreet it has been specifically designed for listed building windows, conservation areas and heritage properties.

Condensation Solution

Where condensation is a major issue, we often specify secondary glazing with balanced trickle ventilation. This provides a simple, cost-effective, and permanent solution.

Granada Secondary Glazing 3 Section Vertical Sliding Window

Secondary glazing is now discreet and functional giving you access to your primary windows when cleaning or maintenance is required. Manufactured from durable aluminium our products provide years of robust, trouble-free service

Granada’s aluminium secondary glazing is available in over 200 RAL colours to suit all tastes and preferences. With a wide variety of window styles and speciality glasses we can cure your acoustic or thermal issue

Granada products not only provide excellent thermal and noise insulation, our choice of finishes and styles have a discreet, unobtrusive finish that is sympathetic to the surroundings and most existing window styles.

Frequently Asked Questions on Secondary Glazing

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 2 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 unique performance that is unmatched by any other window system

Is Secondary Glazing Appropriate for me?

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

What colours is Secondary Glazing available in?

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)
An powder coating line allowing us to finish all products in house in over 200 RAL Colours to suit all taste and preferences

What Glass Type should I choose?

Secondary glazing is normally specified to combat 2 main issues; acoustic or thermal performance. In conjunction with the air cavity, the type of glass specified plays a vital role in rectifying your issue. As standard, all of our products are manufactured with 4mm toughened glass for enhanced security and safety

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

What materias are used for the frames?

As market leaders within the glazing industry, it is important 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 a 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 the product quality. Reducing the amount of aluminium does decrease the cost. 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

What are the main benefits of Secondary Glazing?

Secondary glazing is unique due to the fact it can be customised to meet your functional requirements and dramatically improve upon acoustic, thermal and security issues. Available with a range of glass types, secondary glazing can; decrease noise levels by up to 80% (54 dB), increase thermal efficiency by up to 65% and make your home more secure

Secondary glazing is often used in conjunction with single glazed timber windows however, due to its unique capabilities at blocking sound, we have seen a substantial increase in secondary glazing been used with double and triple glazed uPVC windows
Sound – If you live on a noisy street where noise from passing traffic and trains is causing a nuisance secondary glazing will help. Granada advises the installation of 6.8mm acoustic glass with the secondary glazed units installed with an air cavity of 150mm to 200mm glass to glass. This installation type is referred to as reveal fix. The slimline and discreet secondary glazing is simply installed within the window cavity enhancing the acoustic performance
Thermal – Old, single glazed timber windows can leak vital warm air causing draughts leading to an increased energy consumption. If your windows are currently underperforming, secondary glazing can decrease heat loss through your primary windows by 65%. To achieve a 65% reduction in heat loss, we advise the installation of 6.4mm Low E glass. Low E glass has a specifically designed coating that reflects heat back into your room. When installing secondary glazing to enhance thermal performance, the best installation type is face fix. Face fixing is where you install the secondary glazed unit to the inside face of the primary unit. To gain the best performance results we advise an air cavity of 80mm glass to glass
Security – 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

How to achieve the best thermal performance?

Draughty windows can make a room feel uncomfortable and will result in higher energy costs as heat is escaping. Secondary glazing, with either 4mm, 6mm or 8.8mm Low E glass, can reduce heat loss by up to 65% and instantly prevent draughts. We often recommend the installation of Low E glass as it has a specifically designed coating that reflects heat back in to the room

For optimum performance, we recommend that the secondary glazed unit is face fixed to the interior side of your primary window. With an air cavity of no more than 80mm. Secondary glazing will decrease the amount of heat loss when installed with single, double or triple glazed timber or uPVC windows.
Here at Granada, we can manufacture our secondary glazed units with or without a hardwood subframe. We advise the installation of a hardwood subframe as this acts as a thermal barrier, preventing the aluminium frame and glass cooling due to the temperature of the fabric of the building
Please speak with us directly where we can advise which type of glass, product and installation type will yield the best results

How to minimise condensation?

Secondary glazing, installed with a trickle vent, can help minimise the level of condensation. The trickle vent aids air circulation within the air cavity which, in turn, can minimise condensation. Granada can install an acoustic trickle vent which has been specifically designed to aid air circulation whilst preventing noise waves passing through it

A hardwood subframe can act as a thermal barrier, as aluminium is a great heat conductor, the wooden subframe prevents cold bridging from the fabric of the building onto the aluminium. In turn, this can help reduce condensation as the temperature of the aluminium frame and glass is not cooled by the temperature of the building fabric
Condensation is caused when hot air makes contact with a cold material and where the air is then cooled, where water droplets appear. Minimising the temperature of the glass within your primary units, should help to minimise the level of condensation

Will Secondary Glazing work with Double or 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, whilst standing the test of time

Will I loose the functionality of my existing windows?

Granada’s 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 hinged 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
Our in house design team have designed a range of products that are discreet, functional and high performing. Our product range is suitable for all types of windows and can be tailored to meet most budget

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 aluminium frame and glass is not cooled by the temperature of the building fabric

Warranty

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

How to achieve the best acoustic performance?

Correctly specified and installed, secondary glazing will acoustically outperform all other types of glazing. It is not uncommon to see secondary glazing where double or triple glazing is installed. To achieve up to an 80% acoustic performance, Granada advise the specification of either 6.4mm, 6.8mm or 8.8mm clear acoustic glass and an air cavity, no less than 150mm – 200mm glass to glass
The key to reducing noise levels is to break up the sound waves that pass through the glazed units. The installation of secondary glazing adds an extra barrier and air insulation prevents noise transference. By selecting the correct glass, and a secondary glazed unit that is expertly manufactured with tight seals and no visible gaps, you will hear a substantial decrease in noise levels
Acoustic reverberation is when multiple panes of glass vibrate at the same time. This can increase noise levels and is often a result of having the same thickness of glass within your primary and secondary windows. We advise the installation of a different thickness in the glass, which will help block noise of varying frequencies and help prevent acoustic reverberation
It is important that the secondary glazed units are correctly installed and no gaps are visible between the fabric of the building and the wooden subframe provided. This is why Granada work with the best tradesmen within the UK and often provide detailed training on how to install our products
Reports indicate that a passing diesel bus often creates 85dB of noise. Correctly installed, Granada’s secondary glazing can reduce noise levels by 54 dB. A reduction of 54 dB will reduce the noise level to 31 dB which is the equivalent of a whisper
Please speak with us directly where our technical sales team will be able to recommend a product and glass type suitable to rectify your problem. Often customers over specify glass types which increase the cost of the secondary glazing. Our sales team can offer a solution which will suit most budgets whilst curing your issues

Granada Secondary Glazing Installations

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

Recently installed local Secondary Glazing

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Technical Details

Maximum Dimensions and Weight examples based on Classic 4mm Glazing with optional upgrades to 6mm through 10.8mm Glazing including Acoustic options. 28mm Double Glazed options on Hinged Units also available

BVS Vertical Slider

Max Width 1575mm or Max Height 3325mm

Max Weight 45kg

TBVS Tilt-in Balanced Vertical Slider

Max Width 1568mm or Max Height 3025mm

Max Weight 45kg

SPBVS Slide Past Balanced Vertical Slider

Max Width 1575mm or Max Height 3325mm

Max Weight 45kg

HS2 2 Panel Horizontal Slider