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Sound Reduction Glass Options

We receive many questions regarding the acoustic performance of a typical window and how to increase the sound insulation.

When deciding what option of glass to use and there are many, you must first determine the noise source you are trying to reduce. Typical noise sources include motorways or main roads, airports, factories emitting medium and high frequency noise, railways, and busy public places including pubs and busy night life.

Sound reduction of double and triple glazing

A typical 28mm unit using 4mm glass on both sides will give a sound reduction of 29dB

If you change the outer-pane to 6mm this will increase the sound reduction to 32dB and changing the outer-pane to 10mm will increase this further to 38dB (however using 10mm on larger openings is not advisable)

If you require a dB reduction greater than 35dB you will need to consider specialist options such as Pilkington Optiphon.

Please note that 3dB difference is barely discernible, 5dB difference is clearly discernible and 10dB difference is the equivalent of halving the noise.

Depending on which glass configuration you choose to suit the acoustic performance required will restrict us from being able to energy rate the product through the BFRC.



Noise Reduction for Modern Properties

Secondary Glazing is not only for homes in listed and conservation areas; it also works well in more modern properties. Many customers opt for Secondary Glazing due to the level of road traffic noise, flight paths or a nearby railway.

With Acoustic Noise Reducing Glass you can leave the commotion outside where it belongs.


Saving you money on your energy bills by keeping the heat inside your home.
Up to 20 percent of the home’s heat can be lost through its windows, particularly if they are poorly installed or single glazed. Over time, this can result in a substantial increase in the cost of heating your home by installing energy efficient windows.

Extras for added thermal qualities
Low E Glass – If required we can manufacture sealed units using a low-emissivity glass, Low-emissivity glass (or low-e glass as it is commonly referred to) is a type of energy-efficient glass designed to prevent heat escaping through your windows to the cold outdoors. 
Argon Gas Filled Units – Argon gas is a colourless, odourless, non flammable, non reactive, inert gas that if required is inserted into the cavity of a double glazed unit to reduce the heat conductance between panes, helping to keep heat in during the winter and out during the summer.
Warm Edge Spacer – Warm edge foam spacer bar uses a no-metal warm edge technology providing greater thermal qualities than the standard metal spacer bar.

One of the main problems of single glazed panels is the condensation, which can possibly result in the unhealthy formation of mould. By installing double glazing panels the condensation is highly reduced, especially when using Low E panes.

Noise pollution is a well known consequence of living in the modern world. Its effects on us can include stress, loss of sleep, reduced concentration and loss of enjoyment of your home. 

Most noise pollution enters homes via the windows and doors, making your home quieter with increased insulation which means less outside sound can enter with triple glazing installed the amount of acoustic pollution entering your home will drop extensively.

If the noise is very loud even when installed alongside double glazing. Then secondary glazing is the  choose to reducing noise pollution.

  • Improve the energy efficiency of your windows and help reduce your heating bills with our advanced soft coat sealed units. Promotes passive solar heat gain.
  • Less condensation – energy saving trust advice.
  • Low maintenance. care free.
  • More secure with robust security measures.
  • Reduces your carbon footprint by improving your energy efficiency.
  • Increase home value, as energy efficiency is a huge factor in house prices, it is important that your house is not left at a disadvantage. 

Seal Unit Options

Upgrade Your Existing Windows

About us

One of Ireland oldest glaziers, A  family run business with care  for  customers at the  heart of our business. providing a comprehensive range of glass and glazing products, design and installation services; workshop facilities, as well as in-house installation and servicing teams. We are based in Derry City but have supplied and installed glass all over  Ireland. 

Our mission

Involved in all aspects of glazing, we are the region’s leading glazing provider.  Our drive to provide great service is reflected in our work.

Our staff are all time served accredited glaziers with vast experience to ensure that every job is completed to the highest standard. Your staff are here to help with any glass or glazing enquiry you may have.

Our offer

  • Care & Attention To Our Customers
  • Full Range of Glass Stock & Glazing Services
  • Cost Effective Experienced Trade Supplier

We are dedicated to providing a complete range of glazing products, installed by our in-house teams of experienced and qualified fitters.

Call us


+44 (0) 2871 357 555

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Why Choose APG as your windows installer in Derry

Having worked in the glass industry for well over 35 years we have a depth of knowledge that can help you in your home improvement of any size. we specialise in ALL ASPECTS of glass and glazing.

At All Purpose Glazing our ultimate goal is leaving all our customers more than satisfied. We ensure our glass is of the highest quality, meeting and exceeding all relevant Building and Energy rating regulations.

Our extensive product range includes double and triple glazed PVCu frames, residential doors, door panels, composite doors, patio doors, french doors and conservatories. Our customers demand the best and we strive to provide it through our commitment to quality.

We supply and installs a wide variety of glass and glazing  services right across Northern Ireland. 

From traditional casement windows to shaped frames; elegant vertical sliders to convenient and practical tilt and turn windows; super strong and high security double rebate composite doors to beautiful, outdoor living and space creating bi-folds, we offer a solution to every situation.

Every product is specially made to your requirements – size, style, colour, finish, configuration, ensuring customers get a world-class product that adds value to their home.

All our products are designed and manufactured to deliver superior energy efficiency, strength, durability and security, and come with unrivalled guarantees, giving you total peace of mind.

Call us


+44 (0) 2871 357 555

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