Good sound insulation does not have to be continuous to make a difference, but it is best if it is. Often just small patches on any flat panel, especially metal or fiberglass can be quite effective as it stops the panel from vibrating. Automotive car stereo stuff can be helpful. But I doubt a foam with one layer of foil does much more than keep heat in. (Keeps engine at operating temperature, and keeps it out of the cabin) The best foam for noise will have a sandwich of lead or other heavy foil in between two layers of foam. It will be quite a bit heavier than one would think by looking at it. I believe that is the foam that Shawn is referring to.
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Engine sound insulation
My boat has sound insulation (1 inch foam sheeting with foil facing) on the bulkheads immediately surrounding the engine (Yanmar 2QM15). Not sure if it's original or PO installed, but I suspect the latter.
But the boat really doesn't have a true "engine room", so the bulkheads where the insulation is installed aren't continuous, which means that the engine is not encapsulated by insulation, and to my layman's way of thinking the sound can travel pretty much anywhere. For example, there is only a thin, uninsulated panel between the engine and quarter berth.
I removed some of the insulation to fix some wiring, and doing so made a big improvement in engine access clearances, so I'm thinking about removing it all.
Any reason I shouldn't do this, other than causing (possible) noise level increases?
But the boat really doesn't have a true "engine room", so the bulkheads where the insulation is installed aren't continuous, which means that the engine is not encapsulated by insulation, and to my layman's way of thinking the sound can travel pretty much anywhere. For example, there is only a thin, uninsulated panel between the engine and quarter berth.
I removed some of the insulation to fix some wiring, and doing so made a big improvement in engine access clearances, so I'm thinking about removing it all.
Any reason I shouldn't do this, other than causing (possible) noise level increases?
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