What is flanking transmission?

Flanking transmission refers to sound that bypasses an acoustic barrier by travelling through adjacent building elements rather than directly through the intended acoustic system.

In the context of acoustic louvres and acoustic cladding, flanking transmission can occur when sound travels:

• Around the perimeter of the louvre frame.
• Through supporting steelwork or façade rails.
• Via adjacent wall constructions.
• Through unsealed gaps or service penetrations.
• Through structural vibration paths.

Even if an acoustic louvre has strong laboratory insertion loss performance, poorly detailed interfaces or unsealed junctions can significantly reduce overall system effectiveness.

Flanking transmission is particularly important in plant enclosures and façade openings where the acoustic louvre forms part of a larger noise control strategy. Without careful coordination between trades, the weakest acoustic path often determines the final on-site performance.

At Solinear, we support project teams by advising on perimeter sealing, structural isolation, and interface detailing to help minimise flanking paths and ensure that laboratory-tested acoustic performance translates as closely as possible into real-world results.