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A noise barrier does one job: it puts something solid, or something absorbent, between a source and a listener so that the sound has to travel further to get around it. Everything else — the material, the height, the colour, the price — follows from that geometry. This guide collects the questions we are asked most often and answers them in the order a project actually decides them.
Before a barrier type is chosen, three numbers set the whole design:
How far the receiver is from the source. A barrier only works inside its acoustic shadow. Put the same 3 m screen 8 m from a house and it does very little; put it 2 m from the house and it earns its cost.
How high the receiver is. A ground-floor window and a sixth-floor window are different engineering problems. Sound diffracts over the top edge, and the higher the receiver, the less the barrier blocks.
What the noise actually is. Road traffic is broadband; a transformer hums at a low frequency; a cooling tower roars. Low frequency bends around obstacles far more readily, which is why plant noise is harder to screen than traffic.
Get those three right and the barrier type is almost decided for you. Get them wrong and no amount of material specification rescues the result.
| Type | Used for | What it does well |
|---|---|---|
| Metal absorptive barrier | Highways, trunk roads, rail corridors | Absorbs as well as blocks, so it does not bounce sound to the far side of the road |
| Transparent acrylic or PMMA | Urban roads, bridges, viewpoints, shopfronts | Keeps light and sightlines; the only option where an opaque wall would be refused |
| Acoustic louver | Plant rooms, substations, rooftops, car parks | Lets air through, so equipment keeps cooling while noise is attenuated |
| Fully enclosed structure | Metro works, rail stations, plant yards in tight sites | Removes the top diffraction path completely — the strongest result available |
| Temporary or fabric screen | Construction, events, phased works | Hand-carried, relocatable, no foundation — usable inside a live street |
Two further variants are worth knowing: a solar noise barrier puts photovoltaic panels on the barrier face, which only makes sense where the barrier is south-facing, unshaded and cleanable; and a soundproof blanket is the fabric version of a screen, used where a rigid panel cannot be lifted into place.
Height is the single most misunderstood number in barrier specification. Each additional metre does not add a fixed number of decibels. It adds path length, and path length only helps while the receiver is still inside the shadow.
A domestic or boundary scale: gardens, small plant enclosures, low fences along a service road. It works on a receiver that is close and low. Against a road 15 m away it is largely decorative.
The common roadside height. On a road shoulder, 3 m is usually enough to protect ground-floor and first-floor windows on the far side. Above that, the sound goes over the top.
Multi-lane highways and where the receiver is set back but elevated. The extra metre is often spent on the receiver side rather than the road side, and the post and foundation cost rises faster than the panel area.
Rail corridors, where the source — the wheel-rail contact and the pantograph — sits higher than a car does, and where the barrier has to clear the loading gauge.
The practical limit for a free-standing post-and-panel wall before the structure starts to dominate the cost. At this height the foundation, the post section and the wind load become the design, not the panel.
If a project needs more than 6 m, the usual answer is not a taller wall but a different shape: a cantilevered top, a curved cap, or a full enclosure.
We do not publish a price list, because a barrier is quoted per square metre of a specific section, and the spread between two projects of the same area can be large. What drives it:
Panel type. A perforated absorptive metal cassette costs more than a plain solid panel; transparent acrylic costs more again, and acrylic thickness rises steeply with panel size.
Height, non-linearly. Doubling the height roughly doubles the panels but does far more than double the posts and the foundations, because the overturning moment goes up with the square.
Foundation. A barrier on an existing concrete parapet needs base plates and anchors; a barrier in open ground needs bored or driven posts, and in poor soil a continuous footing.
Posts and fixings. Galvanised H-section steel is the default. Stainless fixings, cast-in anchors and bespoke brackets all add cost, and so does any requirement that panels be removable.
Transport. Panels are bulky and light — you pay for volume, not weight. A long run shipped in 6 m bays is cheaper per square metre than the same area in short bays.
Installation. Crane time, night possessions, traffic management and lane closures are frequently a larger line item than the material. This is the number that surprises first-time buyers.
If a budget has to be protected, the order of savings that does least harm is: simplify the panel build, standardise the bay width, reduce the height where the acoustic model allows, and only then look at cheaper coatings.
These three numbers get quoted interchangeably in enquiries, and they measure completely different things.
Noise Reduction Coefficient is a single-number average of how much sound a surface absorbs rather than reflects, on a scale from 0 to 1. An NRC 0.85 facing means most of the sound that hits it is absorbed. It says nothing about how much sound passes through the panel.
Sound Transmission Class rates how well a partition stops sound passing from one side to the other, in decibels. An STC 29 panel is a relatively light barrier — typical for a metal cassette — and it is the mass and the sealing, not the absorptive facing, that set this value.
Insertion loss is the measured difference in level at a receiver with and without the barrier, on site. It is the only one of the three that describes what the resident actually experiences, and it depends on geometry, ground, wind and the spectrum of the source. A panel with a good STC in a badly placed barrier produces poor insertion loss.
The practical consequence: specify absorption for the face, transmission loss for the panel, and ask for insertion loss to be predicted for the actual section.
Galvanised steel — the default for posts and frames: cheap, stiff, and predictable when the zinc coating is specified by mass per square metre rather than by the word "galvanised".
Aluminium — lighter and corrosion-free, which matters on bridges and coastal sites; an aluminium alloy cassette also lets a deeper profile be extruded for the same weight.
Acrylic (PMMA) — clearer and more UV-stable than polycarbonate, but brittle; it belongs above the impact zone, not at bumper height.
Timber and concrete — still used for rural and landscape-sensitive sites; heavy, cheap per square metre, and awkward to lift.
Highways. Long runs, absorptive face, maintenance access from the shoulder. The highway metal barrier is the standard answer.
Railways and high-speed lines. Higher source, tighter tolerances, and aerodynamic pressure pulses at line speed. See the HSR barrier page for why the panel has to clear the roof line.
Bridges. No foundation is available, so the load goes into the structure through base plates; thermal movement and vehicle vibration govern the fixings. Covered on the bridge barrier page.
Industrial plant and substations. Low-frequency, often tonal noise; mass and height matter more than absorption, and airflow cannot be blocked. This is the civil and plant case.
Urban and residential streets. The constraint is usually visual and planning-related rather than acoustic, which is where transparent panels and stepped heights come in.
The second half of the page is the part you take to a supplier: what to have ready before a quote, the questions buyers ask most often, and what we need from you.
Site plan with the barrier line, and the receiver positions that matter.
Source type and, if available, a measured spectrum — not just an overall level.
Required reduction at the receiver, and the standard it will be judged against.
Barrier height and the base condition: ground, kerb, parapet or deck.
Whether the face must be absorptive, transparent, or both in bands.
Wind load and, for bridges, the structural interface and anchorage details.
Colour and finish, and any planning condition on appearance.
Access for maintenance, and whether panels must be individually removable.
At a well-placed receiver, a properly designed barrier commonly achieves a reduction in the range of 5 to 12 dB. The range is wide because geometry dominates; a barrier in the wrong place can achieve almost nothing.
No. Beyond the point where the receiver is already inside the shadow, extra height buys little and costs a lot in structure. Above about 6 m, change the shape instead.
If there are receivers on both sides, or a hard reflective surface opposite, yes. On a single-sided rural site a plain reflective panel is often enough and cheaper.
Usually yes, with base plates and cast-in or chemical anchors, provided the existing structure can take the overturning moment. That check is the first thing to do, not the last.
Acrylic is dense and performs well in transmission, but it reflects rather than absorbs. It is the right choice for sightlines, not automatically for performance.
It depends on coating and environment: galvanised steel in a coastal or de-icing-salt environment needs a heavier coating or a duplex system, and acrylic needs cleaning to stay clear. We specify for the site rather than quoting a generic service life.
Yes. We manufacture and supply worldwide; for projects outside China the scope is supply only, with erection by the local contractor.
The eight items in the checklist above. With a site plan and a required reduction, we can size the section and quote per square metre.
Send us the barrier line, the receiver positions and the reduction you need, and we will come back with a section, a height and a per-square-metre price. If you are still deciding between types, the project references show what each type looks like once it is built.
Hebei Jinbiao manufactures and supplies noise barriers and fencing; overseas projects are supplied only, with installation by the local contractor.
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