Windows to Block Traffic Noise: What Actually Works and What to Look For

Finding the right windows to block traffic noise is one of the most practical improvements a homeowner can make when road noise is affecting the comfort of their home. Traffic noise is a persistent and broad-spectrum sound source that spans from the low-frequency rumble of heavy vehicles through to the higher-pitched sounds of engines and tyres, and blocking it effectively requires a window that performs well across that full range. This guide covers what drives performance for traffic noise specifically and what to look for when choosing a product.

Why Traffic Noise Is Harder to Block Than Most People Expect

Traffic noise is challenging acoustically because of its low-frequency content. Low-frequency sound waves have long wavelengths that carry significant energy and are harder to attenuate through standard glazing than higher-frequency sounds. A window that reduces the sound of voices and higher-pitched noise quite effectively may still allow a noticeable amount of low-frequency road rumble through, particularly if the glazing specification is not optimised for that frequency range.

Effective windows to block traffic noise need to be specified with this in mind. The glass thickness, pane configuration, gap width, and frame sealing all interact to determine how well the window performs across the full traffic noise spectrum.

Key Factors That Determine Traffic Noise Performance

Glass Mass and Thickness

Heavier glass is harder for sound waves to vibrate and attenuates more sound energy. For traffic noise specifically, using a heavier outer pane, such as 6 millimetre glass on the road-facing side, provides more resistance to the low-frequency content of vehicle noise than a standard 4 millimetre pane.

Asymmetric Pane Thicknesses

Using different glass thicknesses on the two panes of a double glazed unit avoids the coincidence effect, where matched thicknesses resonate at the same frequency and create a weak point in the attenuation curve. For traffic noise, this matters across the low-frequency range where road rumble is most prominent.

Gap Width

A wider gap between the panes provides more acoustic separation. Gaps of 12 to 16 millimetres generally perform better for traffic noise than narrower configurations. Triple glazing adds a second gap, which provides additional disruption to sound transmission and is worth considering for properties directly on main roads or near tram or rail lines.

Multi-Point Sealing

Sound enters through air gaps as readily as through glass. Windows to block traffic noise must seal fully when closed. Multi-point locking systems that compress perimeter seals evenly around the full frame are essential for achieving the full acoustic performance of the glazing specification.

Frame Rigidity

Rigid uPVC frames with multi-chamber construction do not flex under wind pressure or vibrate in response to low-frequency sound in the way that thinner aluminium profiles can. This contributes to overall acoustic performance, particularly at lower frequencies.

What Astellite Offers for Traffic Noise

Astellite manufactures windows designed to block traffic noise across homes in Melbourne using German-engineered Aluplast uPVC profiles and high-performance glazing with acoustic specifications available where required. Triple glazing is available across the range for the highest performance levels.

The most effective styles for traffic noise applications include tilt and turn windows with full perimeter multi-point sealing, fixed windows for maximum acoustic insulation in permanently sealed areas, awning windows for rooms that need ventilation as well as noise reduction, and custom windows for specific opening sizes or performance requirements.

Every window is custom manufactured to your home’s exact dimensions and installed by Astellite’s own team. Astellite holds accreditation from AGWA and WERS, and all products meet Australian building and safety standards. Every installation is backed by a 10-year warranty. The team services homes in Melbourne, Geelong, Melton, and the Mornington Peninsula.