Floating Floor Acoustics on Ships
On a ship, the loudest path into a cabin is usually not the air — it is the steel structure itself, carrying vibration from engines, propellers and foot traffic straight into every space it touches. A floating floor interrupts that path: a mass-spring build-up, mechanically decoupled from the deck, that cuts structure-borne and impact noise by double-digit dB.
This guide explains how sound actually travels on board, what the IMO noise code requires, which build-ups deliver which performance — and the installation details that decide whether the measured dB survive the shipyard.
How Sound Travels on a Ship
Marine acoustics starts with one fact: steel is an excellent conductor of vibration. Six things to understand before specifying any acoustic floor.
Structure-borne noise
Machinery vibration — engines, gearboxes, propellers, thrusters, HVAC — travels through the hull and decks as vibration and re-radiates as sound in the cabin. The dominant noise path on most vessels.
Impact noise
Footfall, trolleys and dropped objects strike the deck and transmit downwards into the spaces below — the marine cousin of the apartment-ceiling problem, measured as impact sound transmission.
Airborne noise
Voices, music and PA systems crossing bulkheads and decks through the air. Handled mainly by linings, ceilings and insulation — floors contribute, but it is not their main job.
The mass-spring answer
A floating layer (mass) on a resilient layer (spring) forms a system that isolates vibration above its resonance frequency — the physics behind every floating floor, marine or land-side.
Damping
Visco-elastic layers convert vibration energy into heat inside the build-up — attacking the vibration itself rather than just decoupling from it. The two mechanisms stack.
Flanking
Sound takes the easiest path. One rigid bridge — a bolted equipment foot, a hard-grouted pipe penetration, a bridged perimeter strip — can bypass the whole system.
Acoustic Build-Up Options
Four ways to buy quiet, from full floating systems to thin refit underlays — usually combined zone by zone on the same vessel.
Floating Floor System
- Mechanism: mass-spring decoupling of the whole walking surface
- Where: cabins and accommodation over machinery — wherever structure-borne noise dominates
- Earns: the biggest structure-borne and impact gains, plus the A-60 fire rating in one certified build-up
Visco-Elastic Damping Layers
- Mechanism: vibration energy converted to heat inside the build-up — TEFROTEX VISCOELASTIC Layer and Thix
- Where: comfort-class cabins and public spaces; upgrades inside certified systems
- Earns: meaningful dB at millimetres of thickness and little added weight
Acoustic Underlays + Finish
- Mechanism: resilient layer under vinyl, LVT or carpet — the underlay range with ΔLw-rated options
- Where: dry refits and interiors where a full floating build is not needed or not possible
- Earns: impact-sound improvement at minimal height — with IMO-approved options for SOLAS vessels
Acoustic Finish Floors
- Mechanism: coverings with integrated acoustic backing — acoustic vinyl and marine carpet from the marine range
- Where: the finishing touch on any build-up; corridors and public areas
- Earns: extra impact-sound comfort and drum-noise reduction on top of the system numbers
Specify an Acoustic Floor with Trivaro
From noise target to certified build-up in three steps — with the test reports to back the numbers.
Share the target and the zones
The applicable limit (IMO code or comfort-class notation), the zones and what is under them, plus fire ratings, height and weight constraints.
We propose the build-up per zone
Floating system, damping layers, underlay and finish matched to the target — with the acoustic test reports and the fire type-approvals for the complete build-up.
Quotation, delivery, documentation
Quantities per zone, lead times and a B2B quotation across the EU — with the documentation package your Class surveyor and acoustic consultant both sign off.
Related Reading
The neighbouring guides — the fire side of the same build-up, the weight trade-off and the systems hub.
A-60 floating floor systems↗
The pillar guide — the certified build-up that delivers fire rating and acoustics together.
Weight & build-up thickness↗
What the acoustic layers cost in kg/m² — and the levers that keep the deck light.
Marine flooring systems↗
Every certified deck build-up zone by zone, from bare steel to finished floor.
Acoustic underlays↗
ΔLw-rated underlays for vinyl, LVT and carpet — the thin end of the acoustic toolkit.
Floating Floor Acoustics — Frequently Asked Questions
What owners, yards and interior contractors ask when cabin noise is on the line.
01 How does a floating floor reduce noise on a ship?
It is a mass-spring system: the walking surface (mass) rests on a resilient layer (spring) with no rigid connection to the steel deck or bulkheads. Vibration from engines, propellers and foot traffic must cross that decoupling — and above the system’s resonance frequency, most of it does not. Visco-elastic layers absorb further energy inside the build-up. The result: less structure-borne noise into the cabin and less impact noise into the spaces below.
02 Are ship cabins soundproof?
No cabin is fully soundproof — the target is compliance and comfort. The IMO noise code (Resolution MSC.337(91), mandatory under SOLAS for most new ships over 1,600 GT) limits sleeping cabins to 55 dB(A) on ships of 10,000 GT and over, 60 dB(A) on smaller ships; comfort-class notations set stricter voluntary targets. Floating floors, damped ceilings and insulated linings together get a cabin there.
03 How many dB does a floating floor reduce?
System-dependent — the honest answer is a range: well-designed marine floating floors deliver double-digit dB improvements in structure-borne and impact sound versus a bare steel deck, with visco-elastic build-ups at the upper end. The exact figure depends on mass, resilient layer, damping and installation quality. Specify from the measured test reports of the specific system — we supply them with every proposal.
04 What ruins the acoustic performance?
Flanking — any rigid bridge past the decoupling: bridged perimeter strips, hard-grouted penetrations, equipment bolted through to steel, screed spill in the perimeter joint. One bridge can cost a large share of the measured performance, which is why installation per the approved drawing matters as much as system choice.
05 Does the acoustic build-up affect the fire rating?
It must not — acoustic layers belong inside the type-approved fire system. An uncertified damping layer in an A-60 build invalidates the fire approval; certified systems deliver both the rating and the acoustics in one approved layer sequence. See the A-60 floating floor guide.
06 Do acoustic underlays work on ships?
In the right place, yes: thin ΔLw-rated underlays improve impact sound in dry refits and land-side-style interiors — but they complement rather than replace a floating floor where structure-borne machinery noise is the problem. On SOLAS vessels, underlay and finish must carry the applicable IMO approvals like any other covering.
Cabin Noise Target on the Line?
Trivaro supplies certified marine floating floor systems, visco-elastic damping layers and IMO-approved acoustic finishes across the EU — specified from measured test reports, not brochure adjectives.
Send your noise target, zones and constraints — we respond with a build-up per zone, the test reports behind the numbers and a B2B quotation.
