HOW SUPERYACHTS DO IT

Sound insulation is a major challenge with so much machinery involved, so the builders go to trusted suppliers like Halyard for large exhaust mufflers and rubberised engine beds. They also identify the frequency of any unexpected droning or humming aboard, as this indicates the likely source. One yard found a hull-wide rumbling was caused by the flow of water past the bow thruster tunnel. A quick mod and it disappeared.

Throughout the boat, equipment is isolated from the deck with large rubber mounts. Bulkheads are often thickened to prevent resonance, and tanks are heavily lagged.

this is the deck head of an amels superyacht. note how pipes that could vibrate are held in rubber-mounted brackets

Spray foam on the deckhead of a large Sunseeker motoryacht. this performs a dual role of both heat and sound insulation