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Schools and Education

Get Tranquil, Warm, and Secure Classrooms for Better Learning

 

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Are your classrooms disturbed by noise outside? Are they not well-ventilated? Check out how Granada’s secondary glazing can help you.

Granada’s secondary glazing is a quick and affordable way to make any place of education tranquil and comfortable. This is a discreet, non-disruptive way to ensure that your educational institution is compliant with School Regulations.

The Education (School Premises) Regulations of 2012 have recommended that schools and centres of learning should have rooms that can block out sound.

It’s only logical that the best way for students to concentrate is by eliminating distractions.

The best way to do it is with our high-performance secondary glazing, which can reduce outside noise by up to 80%.

We have an immensely durable product that we manufacture and install ourselves.

As a result, we have full control on the quality and can ensure quick lead times and installation.

Secondary Glazing Face fixed
Secondary Glazing Windows
Secondary Glazing Windows
Hinged units Granada

What’s more, our products are available in a range of over 200 RAL colours, giving you the freedom to customise your purchase.

Our secondary glazing can be installed together with your regular windows, thereby enhancing their performance. It can be installed even your building is listed Grade I or II, or is in a conservation area.

In fact, such buildings benefit the most from our installations as they help improve the thermal efficiency without affecting the outward appearance of the building.

Benefits of Secondary Glazing:

  • Reduce Noise levels by up to 80%
  • Easy to Install, DIY or Installed by tradesman
  • Reduce heat loss through existing window by up to 65%
  • 10% more heat efficient than double glazing
  • Can be installed within conservation areas
  • Available in over 200 RAL colours
  • Arched frames
  • Delivery 10 days of order
  • 5 year warranty (FENSA warranty of installers)

Frequently Asked Questions

To what extent will secondary glazing reduce the sound pollution in my home?

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 acoustic glass and an air cavity no less than 150mm – 200mm glass to glass.

Reports indicate that a passing diesel bus often creates 85dB of noise. Correctly installed, Granada’s secondary glazing can reduce noise levels by 54dB, a reduction of 54dB will reduce the noise level to 31dB which is the equivalent to a whisper.

What does the installation process consist of 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 30 minutes to 1 hour. To view the installation of secondary glazing please visit our video library web page: VIDEO LIBRARY

We work closely with over 500 national homeowner/trade customers who will make an appointment to measure and install at your convenience. For the DIY market, Granada can supply secondary glazing as supply only where installations videos and what measurements you need to take can be viewed here.

Will I lose the functionality of my 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 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.

Our Products for Schools and Education

We offer a complete range of window styles, including vertical and horizontal sliders, and other custom-built secondary glazing windows in more than 200 RAL colours. Granada’s products help improve the thermal performance, noise, and security issues for schools and education centres.

The benefits

Acoustic Dampening

Schools and education centres are required to provide a noise-free environment for students. This is easily accomplished with our secondary glazing which can reduce noise by up to 80% easily.

Thermal Performance

A comfortable temperature is essential for students in a crowded classroom. With our secondary glazing, you can ensure thermal performance where a room remains warm or cool for longer, with no additional energy consumption.

Extra Secure

Our secondary glazing adds to the security of the windows because of their strong frames, and the fact that they don’t require access from outside. This allows the classrooms to create a safe haven for students.

Ventilation

Education Regulations stipulate the amount of ventilation a classroom needs, which is not possible if you seal windows for insulation. With Granada’s secondary glazing, you can solve that issue easily.

Durability

The sturdy aluminium frames of our secondary glazing ensures that your installations last for years. In fact, we offer a 5 year warranty on all our frames and glass, and a 2 year warranty on all moving parts.

Outer Appearance

Since our secondary glazing fits discreetly on the inside of the windows, they help improve a building’s performance unobtrusively. As a result, they are a great choice for listed and heritage buildings.

Windows are an important and functioning part of any room, especially a school room. They allow light and ventilation, but unfortunately, they can also let in unwanted sounds and intruders.

Granada Glazing, as the largest manufacturer and supplier of aluminium secondary glazing, understands the importance of window performance.

We have built up years of experience with our extensive secondary glazing network across the country.

We bring to you aluminium secondary glazing products in a spectrum of more than 200 RAL colours. We can tailor the style and size of our aluminium products to whatever specifications you desire.

Essentially, we give you bespoke products that fit the needs of your educational institution perfectly.

Our robust aluminium frames and high-quality installation will ensure that your secondary glazing lasts for years. Throughout its life, it will continue to give you superior performance.

In fact, we are so confident about this that we give you a 2 year warranty on all its moving parts along with a 5 year warranty on the frames and glazing.

Our inconspicuous installations will continue to make your rooms better at thermal retention by up to 65%. Whether it is warm air in winter or cold air from air conditioning in summer, these fittings will keep your rooms at the temperature you want them.

We also ensure that school and education centres benefit from the reduced noise that our secondary glazing provides. In fact, we have a proven track record of satisfied customers, as is evident from the complimentary and happy testimonials our clients give us.

If you want to browse through our complete range of secondary glazing products, you can do so by downloading our online Granada brochure.

You can also talk to someone from our customer care team to get additional advice. One of our helpful team members will guide you through your glass choice and window style, so that you get the performance you need and deserve.

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Fixed Secondary Glazing FAQs

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.

How do I Keep my House Warm?

Having double glazing, or Secondary Glazing installed in your home is an essential way to enhance the thermal efficiency of your home. Secondary Glazing will help to keep your home warm even in the coldest winter months!

How do I 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 specially designed coating that reflects heat into 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.

Will Secondary Double Glazing Eliminate Draughts?

Secondary Glazing is a great way to eliminate draughts in your home. Not only will your home remain warm against the cold draughts, but Secondary Glazing also helps keep the warm air inside your home. This means you will have reduced heating bills across time! Saving you money!

Will Secondary Glazing Reduce Heat Loss?

Of course! Secondary Glazing acts as a second barrier between your home and the outside. This helps to keep your home warm even in the coldest winter months. Helping to trap the warm air inside, and keeping the cold air out.

What are the Main Benefits of Secondary Glazing?

Old, single glazed timber windows can leak vital warm air causing draughts leading to 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.

How do I 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 specially designed coating that reflects heat into 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.

Can I Reduce Noise Pollution in my Home?

Secondary Glazing will help protect your home against noise pollution. The addition of Secondary Glazing into your home can help to block external noise pollution by up to 80%. The Secondary Glazing panels act as a second barrier against the sound from the outside. To achieve optimal performance, it is advised that Secondary Glazing is fitted with a gap of 150mm - 200mm from the primary window.

To What Extent will Secondary Glazing Reduce the Sound Pollution in my Home?

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 reduce noise levels by up to 80%, Granada advises the specification of acoustic glass and an air cavity no less than 150mm – 200mm glass to glass. Reports indicate that a passing diesel bus often creates 85dB of noise. Correctly installed, Granada secondary glazing can reduce noise levels by 54dB, a reduction of 54dB will reduce the noise level to 31dB, which is the equivalent to a whisper.

Can I use Secondary Glazing for Noise Reduction?

Yes! After installing Secondary Glazing you will ensure that your home benefits from reduced noise pollution. The second barrier that Secondary Glazing helps to reduce the amount of noise coming into your home. Helping you to relax in peace!

Will Secondary Double Glazing Reduce Noise?

Of course! Secondary Glazed Windows give an extra barrier between your home and outside world helping to keep noise at bay. Relax throughout the year in peace after Secondary Glazing installation.

What are the Main Benefits of Secondary Glazing?

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 installed within the window cavity, enhancing the acoustic performance.

How Do I 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 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 while curing your issues.