Block Outside Noise
Problem guide

Traffic noise: diagnose the path, not just the sound.

“Traffic noise” is not one problem. Steady tyre and engine sound, low-frequency rumble, and intermittent peaks each behave differently and point toward different checks.

Three different problems, not one

Steady airborne noise (the general hum of tyres and engines at a roughly constant level) is the most straightforward to diagnose, since it's present continuously while traffic flows.

Low-frequency rumble (heavy vehicles, diesel engines, or distant highway drone) behaves differently from higher-pitched sound. It is generally less affected by sealing small gaps than airborne noise is, because the surrounding material blocks less low-frequency energy to begin with; added mass and decoupling tend to matter more for it than sealing alone.

Intermittent peaks (horns, braking, acceleration, motorcycles) are harder to characterise from a single description than a constant level. Logging when peaks happen and how long they last is often more useful than assuming a fix before that pattern is clear.

The likely path: façade first

Road, rail and aircraft noise typically reaches a home through the building façade (windows, doors, vents and gaps) rather than through a shared interior wall or ceiling/floor between units. See Windows for the detailed closure, perimeter and flanking checks; they apply here without needing to be repeated. If a vent turns out to be involved, never seal, cover, or alter it yourself: that needs a landlord or a qualified professional, the same as on that page.

When the path is unclear or flanking

Traffic noise reaching you mainly through a shared wall or ceiling/floor is an unusual combination: it may be flanking in through a window, door or vent on that side rather than travelling directly through the surface it seems to come from, or more than one source may be involved. Run the diagnosis for a read that accounts for your specific source, character and path together.

Low-cost checks before replacing anything

Compare the level right at a suspected opening against the middle of the room, and note whether the sound tracks a schedule (rush hour, a specific route) or is constant: a scheduled pattern can point to a specific, identifiable source rather than a diffuse one.

When no single weak point is clear

If nothing stands out (the level is similar everywhere, or you can't tell where it's loudest), treat this as a whole-envelope question rather than assuming one fix. A single product marketed at one opening type is unlikely to address noise arriving broadly; whole-façade measures matter more here, and are worth confirming with a professional assessment before spending on them.

Listener-level options: partial coping, not whole-room cancellation

ANC sleep earbuds/headphones, earplugs, or steady background/white-noise masking can reduce what reaches you. ANC generally works best on steady, low-frequency sound (the kind a constant traffic drone produces), and is less effective against sudden, irregular peaks such as horns or braking. None of these options address the transmission path itself; they reduce what you notice, not what enters the room.

If you use earplugs, hearing protection, ANC, or masking at night, make sure you can still hear smoke/CO alarms, dependants, or other important signals.

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Sources