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→Isolating the Engine Room
In the engine room an ideal ceiling would provide attachment points for a drop ceiling. This would require spring hangers (or even rubber engine mounts) capable of withstanding high accelerations of mass to avoid detaching the ceiling in a capsize. The attachment points should be 100-200mm long. Attach two layers of non-combustible panels bound with viscoelastic glue. Several marine-approved panel materials are available.
[[File:DropCeiling.png|thumb|left|280px|Schema for a robust drop celingceiling]]
Where the composite panel meets the walls, prevent flanking noise leaking through using a flexible acoustic strip such as neoprene.
On the room side, apply to the composite panel composite insulation such as lead-fibreglass with the fibreglass rated at, say, R13. Since we are dealing with wavelengths of, say, 5 to 14 in, the thickness of the insulation should be in the same range. <i>An alternate arrangement is shown in the image.</i>
A ceiling of this type, combining mass, decoupling, resilient mounts and insulation is capable of attenuating noise 60-75 dB over 1000-5000 Hz.<ref>The Green Glue Company, http://www.greengluecompany.com</ref>