Cars passing by from early morning, trams running outside the window, car horns, motorcycles, a nearby railway line or the noise coming from a busy city centre – external noise can significantly disrupt the peace and comfort of your own home. The problem becomes particularly troublesome at night, when even individual sounds are much more noticeable.
In such locations, choosing windows should not be based solely on thermal transmittance values or the appearance of the profiles. The acoustic insulation of a window – its ability to reduce noise entering from outside – can be just as important.
This is why windows for a flat overlooking a busy road should be selected differently from those intended for a house in a quiet residential area. However, there is no single window model that will be the best choice in every situation. Both the noise level and its characteristics matter. Road traffic generates different sound frequencies from trains or aircraft. The best sound-insulating windows should therefore be selected according to the actual noise conditions surrounding the building.
Rw – a key value to know before buying windows
The primary parameter used to describe the acoustic performance of windows is the Rw sound reduction index, expressed in decibels (dB). In simple terms, the higher the value, the better the construction is at reducing sound transmission. However, choosing windows solely on the principle that “the highest Rw is always best” is not necessarily the right approach. For a more detailed assessment, correction terms are also used to relate a window's performance more accurately to specific types of noise. This is particularly important for low-frequency sounds associated with heavy road traffic.
It is also worth checking whether the stated value refers to the complete window or only the insulating glass unit (IGU). Excellent acoustic performance of the glazing alone does not guarantee the same result for the complete window assembly. The frame, gaskets, connections between individual components, window dimensions and installation method all influence the final result. Therefore, when comparing offers, it is best to analyse performance values that apply to the complete product.
A window overlooking a busy street
How are windows designed to protect zgainst traffic noise?
Contrary to popular belief, good sound insulation is not simply a matter of using as many panes of glass as possible. The construction of the insulating glass unit plays a crucial role.
One way to improve acoustic performance is to use glass panes of different thicknesses. Thanks to this asymmetric configuration, the glazing unit can reduce the transmission of different sound frequencies more effectively than a unit made up of identical panes. Acoustic glazing may also incorporate laminated glass with specialised interlayers designed to improve sound insulation. The width of the cavities between the panes and the overall glazing configuration are also important. However, the glazing is still only one part of the window.
Windows designed to protect against street noise should also feature suitable profile construction, effective seals and properly adjusted window hardware. Even small gaps can reduce acoustic performance, as sound, much like air, can pass through weak points in the building envelope. For this reason, when choosing sound-insulating windows, it is worth considering the entire system rather than focusing on a single impressive value listed in a catalogue.
The best windows for noisy streets won't help without proper installation
You can choose an excellent glazing unit and a window with a high declared sound insulation rating, only to significantly reduce its performance through incorrect installation. The gap between the window frame and the wall requires particular attention. If the connection is not properly constructed and sealed, noise may enter the room through this area.
The acoustic performance of a window is therefore closely linked to the quality of its installation. Other components within the window opening are also important. If trickle vents are installed, it is essential to remember that they can affect the acoustic performance of the entire assembly. In noisy locations, models with suitable sound insulation properties should therefore be selected. The same principle applies to roller shutter boxes and other elements of the building envelope. If reducing noise is a priority, the window and its surrounding components must be treated as a single system. The weakest element can affect the performance achieved by the remaining parts of the construction.
How to choose windows for a home on a busy road
Before buying windows, the first step is to identify the type of noise you need to protect against. A bedroom overlooking a quiet courtyard may have very different requirements from a living room located just a few metres from a multi-lane road.
Buildings situated near railway tracks or airports may require even greater attention. This means that not every window in a house necessarily needs to have identical acoustic performance. In some cases, a better solution is to install windows with enhanced sound insulation primarily on the side of the building facing the noise source. It is also important to remember that acoustic insulation should not be considered separately from the other properties of a window. Thermal performance, airtightness, security, natural light and everyday ease of use remain equally important.
At Aikon Distribution, we help customers choose window configurations suited to the specific conditions of their projects, including requirements for noise protection.
Because the best windows for noisy streets are not necessarily those with the greatest number of glass panes or the highest value in a specification table. What matters most is that the complete product – from the glazing and profile system to the installation method – is properly suited to the location in which it will be used.
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