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Polyurethane foam to eliminate hull noise?

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Polyurethane foam to eliminate hull noise?

Old 04-07-2019, 12:20 PM
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Default Polyurethane foam to eliminate hull noise?

I have a Fish Hawk 230WA I bought new in 2002. About 3 years ago it developed a crackling noise under the helm in rough seas. I've had 2 professionals look at the boat. Both came to the same conclusion after inspecting the boat, it's not a structural issue. The boat is solid. The noise cannot be reproduced on land. The second guy who looked at it really dug about as deep as possible without cutting holes using a camera scope and rubber mallet. His suggestion was to live with it. Which I did.

Fast forward, I'm getting out of boating for a while and selling the boat. I would really like to resolve the noise prior to selling it. I'm not the type to hide anything from a potential buyer and feel the noise could scare buyers away. I called boat repair guy #2 and spoke with him about my options. He feels the only non-invasive fix is to fill the area where the noise is coming from with polyurethane foam and hope for the best. No guarantees. I agree to do it, but can't get the guy here to do it. Multiple calls, he's just too busy. I'm entertaining doing some research, buying some foam and doing it myself.

Has anyone done this successfully?
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Old 04-07-2019, 02:06 PM
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it takes a "special foam" not to absorb water, you will not be able to do it yourself.
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Old 04-07-2019, 04:55 PM
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Foam must be closed cell type
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Old 04-07-2019, 05:20 PM
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Inject with hydrophobic urethane foam. If you have a concrete repeat company in your area call them. Or if your close to Delaware pm me
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Old 04-08-2019, 09:02 AM
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To be honest, sound deadining to not hear a cracking sound sounds as a not very good solution to me.
if yo hear a cracking/crackeling noise, then something is cracking, and that is not good....
You may poull the console to check the reason for this noise to avoid that something suddenly break or become loose!
Chris
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Old 04-08-2019, 12:44 PM
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Is there anything on the hull bottom in that area? It could be a hydrodynamic issue.

sam
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Old 04-08-2019, 05:51 PM
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Maybe try some of the sound deadening material stereo shops use for their higher end installs? Assuming you can pul the floor up or access the bilge area.
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Old 04-09-2019, 03:13 PM
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How about spraying the area with a spray lubricant? Something heavier than WD40.
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Old 04-09-2019, 04:30 PM
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More of a creaking noise rather than cracking?
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Old 04-09-2019, 06:06 PM
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2002 is it? Could be deck separating from the foam underneath. I am in the process of re decking my 1996 Maritime Skiff. Big Job. Cut around the deck about 5" from sides to remove old deck bit by bit. Removed loads of soggy foam. 315# worth out of a 14' boat plus the weight of the decking, which was glass over plywood, which was also rotted. 2002 is only a few years younger.

So far I have done all of the work. Many hours of donkey work. Just about ready for new deck. Getting some skilled help to make a template then section up replacement deck which will go down over the 5", with a bit of a gutter around the sides, of the old deck.

No foam going back in the boat. Been collecting plastic bottles. They will be sealed in the under deck compartments. I will live with any noise due to no foam. Boat should be good for another 23 years after I am finished with it.
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