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Noise on a vessel doesn’t always stay where it starts. In many cases, it rises.
Deck-to-deck airborne noise occurs when sound travels through structural deck and ceiling assemblies and can be reduced by integrating mass-loaded barrier systems within those assemblies. Even when the source is contained below, upper decks can still experience 80–95 dB(A), creating unexpected noise exposure in areas meant to be quieter.
Along California’s marine routes, where vessels often operate continuously and across multiple levels, this type of vertical noise transfer becomes a serious operational concern.
Under OSHA guidelines applied in California:
- 85 dB(A) – Threshold for required hearing conservation
- 90 dB(A) – Maximum allowable exposure over time
This means crew on upper decks may be exposed—even without direct proximity to the source.
What Makes Vertical Noise So Difficult to Control
Unlike typical airborne noise that travels through open space, this type of sound moves through the vessel itself.
It uses structural elements as a pathway:
- Floors and ceilings act as transmission surfaces
- Structural framing carries sound between levels
- Continuous connections allow noise to bypass isolated treatments
Because of this, treating walls alone often doesn’t solve the issue. The sound simply finds another route—usually upward.
Changing the Approach: Treat the Structure, Not Just the Surface
To reduce this type of noise, the solution must be built into the assembly—not applied after the fact.
MassiCore® Marine 90 (ANC-MB90) provides a way to interrupt this vertical transfer by adding a dense, flexible barrier layer within deck and ceiling systems.
Instead of absorbing sound, it works by preventing it from passing through structural layers.
Where it makes the difference:
- Between engine room ceilings and upper deck floors
- Inside multi-layer deck assemblies
- Across structural junctions where sound transfers between levels
Its flexibility allows it to fit within tight structural spaces without requiring major design changes.
What Changes Once the Path Is Controlled
Once vertical transmission is interrupted, the impact is noticeable across the vessel:
- Upper deck noise drops from ~90–95 dB(A)
- To approximately 60–65 dB(A)
This creates a clear separation between noisy mechanical zones and quieter operational areas.
What this improves:
- Reduced noise exposure in elevated compartments
- Better communication across decks
- Improved comfort in work and rest areas
- More predictable acoustic performance vessel-wide
Why This Is Critical for California-Based Vessels
Marine operations along the California coast often involve complex, multi-deck vessels where space is limited and systems are tightly integrated. In these environments, noise doesn’t just spread outward—it spreads upward.
If not addressed, this can lead to:
- Noise appearing in areas far from the source
- Ineffective results from traditional wall-based treatments
- Increased strain on crew working in upper compartments
Controlling deck-to-deck transfer ensures that noise stays contained within its intended zone. This makes it one of the most effective deck-to-deck noise control solutions in California for marine vessels.
