Noise Barrier Procurement: Which Technical Specifications Matter Most?

When procuring a noise barrier for a highway, railway, bridge or other infrastructure project, comparing suppliers by price or panel thickness alone can lead to an incomplete technical evaluation.

A noise barrier is a system rather than a single panel. Its performance depends on the acoustic properties of the panels, structural design, connections, posts, foundation and installation conditions.

For procurement teams, the following specifications deserve priority.

1. Acoustic Performance

The first question should not simply be “How many decibels does the barrier reduce?”

A supplier should clearly identify the acoustic performance being declared and the test method used.

For road traffic noise reducing devices, EN 14388 addresses characteristics including sound absorption and airborne sound insulation, with supporting EN 1793 test methods used to determine declared acoustic values.

For an absorptive barrier, procurement documents may require data such as:

• Sound absorption performance

• Airborne sound insulation

• Test standard and test conditions

• Tested product construction

• Laboratory test report

More importantly, the acoustic rating should correspond to the actual barrier configuration being quoted, rather than a generic material value.

2. Barrier Height, Length and Configuration

Acoustic performance cannot be evaluated independently from geometry.

The required height and length depend on the relationship between the noise source, barrier and receiver. Openings, gaps and barrier ends can also reduce the effectiveness of the system.

Therefore, a procurement specification should define:

For complex projects, the supplier should work from project drawings rather than simply quote a standard panel size.

3. Wind Load and Structural Capacity

A noise barrier installed beside a highway or on a bridge is also a structural system.

Wind load should therefore be specified for the actual project location. The design needs to consider not only the acoustic panel but also the posts, connections and foundation.

FHWA guidance specifically notes that the barrier system, including posts, panels and foundation, needs to be designed for local wind loads together with the relevant soil conditions.

Depending on the project, procurement documentation may need to define:

• Design wind load

• Static load

• Self-weight

• Post section and material

• Connection design

• Foundation requirements

• Allowable deformation

• Applicable structural standard

A panel with good acoustic performance is not sufficient if the supporting structure has not been engineered for the installation environment.

4. Sound Absorption vs. Sound Insulation

These two properties should not be treated as interchangeable.

Sound absorption describes how much incident sound energy is absorbed by the barrier surface.

Sound insulation concerns how effectively the barrier prevents sound from passing through the barrier.

This distinction matters when comparing different constructions. FHWA separately discusses barrier absorption and sound transmission, while EN 14388 also treats sound absorption and airborne sound insulation as separate declared characteristics. 

For procurement, ask suppliers to provide the specific acoustic test data for the proposed barrier construction, rather than accepting a single unqualified “noise reduction” figure.

5. Material and Corrosion Protection

Material selection should be linked to the expected service environment.

For steel noise barriers, the specification should identify:

• Steel grade

• Panel construction

• Galvanizing or other corrosion protection

• Coating system

• Coating thickness where applicable

• Fastener material

• Expected service environment

For coastal, high-humidity or chemically aggressive environments, corrosion protection becomes particularly important.

The procurement specification should also distinguish between panel material and structural steel components. They do not necessarily have the same material or surface-treatment requirements.

6. Durability and Service Life

A low initial purchase price does not necessarily represent a low lifecycle cost.

For long-term infrastructure projects, procurement teams should request information covering:

• Declared service life

• Corrosion resistance

• UV resistance where applicable

• Weather resistance

• Acoustic performance retention

• Replacement requirements

• Maintenance requirements

EN 14388-related durability assessment can address both acoustic characteristics and non-acoustic performance over the product's intended life.

This is particularly relevant when the barrier is expected to remain in service for decades.

7. Connections and Acoustic Leakage

One specification that is often overlooked is the connection between components.

Even when individual panels have good laboratory acoustic performance, poorly designed joints can create acoustic leakage.

The complete system should therefore address:

• Panel-to-panel joints

• Panel-to-post connections

• Sealing details

• Gaps at the bottom

• Interfaces with structures

• Expansion joints

• Transitions between different barrier types

The European noise barrier guidance specifically recognizes that leakage at junctions can adversely affect the acoustic performance of the overall system. 

This is why procurement should evaluate the complete barrier assembly, not only the panel material.

8. Impact, Fire and Other Project-Specific Requirements

Acoustic performance is only one part of a project specification.

Depending on the location and applicable regulations, additional requirements may include:

• Resistance to impact

• Fire performance

• Shatter properties

• Light reflectivity

• Release of dangerous substances

• Snow or maintenance loads

• Environmental exposure

These characteristics are included among the non-acoustic or additional performance considerations under EN 14388 and its supporting standards.

Not every project requires every test. The correct approach is to identify the requirements from the project environment and applicable standard, then specify only the characteristics relevant to that installation.

What Should Be Included in a Noise Barrier RFQ?

A technically useful RFQ should provide enough information for different suppliers to quote the same engineering scope.

At minimum, Jinbiao recommends defining:

This makes supplier quotations easier to compare and reduces the risk of receiving technically different systems under apparently similar quotations.

A Better Way to Compare Noise Barrier Suppliers

For infrastructure procurement, the most useful comparison is not:

Price → Panel Thickness → Claimed dB Reduction

A more complete evaluation is:

Acoustic Performance → Structural Capacity → System Configuration → Durability → Compliance → Installation → Lifecycle Cost

The objective is not simply to purchase a noise barrier panel. It is to procure a noise control system that meets the project's acoustic, structural and environmental requirements.

Jinbiao provides noise barrier solutions for highway, bridge, high-speed railway, civil and other infrastructure applications, with product configurations developed according to project requirements.

Need a noise barrier quotation based on your project specifications? Contact Jinbiao with your drawings, required dimensions and technical requirements for evaluation.