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Old 08-15-2016, 10:34 AM   #1
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Sound Proofing Material Recommendations

I have to replace the material for sound and I suspect heat transfer from the engine compartment. The original material is foil faced with a yellow material under that, it has started to fall apart. The marina has some named "Soundown". I would appreciate any reviews on this and any other brands that the members are familiar with. Thank you in advance for your help.
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Old 08-15-2016, 10:58 AM   #2
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I used 2" soundown when I rebuilt my engine room. It is very effective although it is also a bit pricey. It has held up well although it isn't very abrasion resistant. The adhesive backing was all I needed to hold it on except for one piece on the overhead where I had to use screws.
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Old 08-15-2016, 11:05 AM   #3
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Acoustic and Thermal insulations don't typically do each others jobs very well, but acoustic insulation will have some thermal properties. There are exceptions but generally this is the case.

Mass is what stops noise, soft stuff absorbs, there is a difference. You did not describe if your existing insulation was heavy or not, but there are two types of mass commonly used in boats, mass loaded vinyl and lead. These are commonly used in the US in either 1 or 2 lbs per sq ft.

The most common replacement insulation for a vessel like yours will be a vinyl / foam composite insulation. It will have a decoupler layer to enhance the performance of the vinyl barrier, and an absorption layer towards the noise. There will usually be a vapor barrier "face" that will be foil or mylar type finish.

A less expensive and maybe closer to a direct replacement will be just an absorber like acoustic foam or fiberglass with a vapor barrier.

Soundown is a brand, and they make hundreds of products including about a few dozen versions of vinl / foam insulation. The usual thickness goes from 1/2" to 2" in 1/2" increments, and with either a 1lb sq ft or 2lb sq ft choice.

For diesel boats 2lb is better for the lower frequency noise from a diesel engine. For a gas boat, 1lb is usually adequate.

Noise is easy, more is better.

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Old 08-15-2016, 02:39 PM   #4
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What is on the hatches now is heavy and probably 1" thick. It is deteriorating on the hatches and that is what I'am looking to replace. The Soundown available from the marina is 1/2" or 1" thick, I will have them try to source the thicker product. Thank you
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Old 08-15-2016, 03:00 PM   #5
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Soundown 2 inches thick with 2 lbs of lead per sq ft.

Aint cheap!
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Old 08-15-2016, 03:19 PM   #6
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Nothing I've found for a boat is cheap, other than a few owners I've ran across.
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Old 08-17-2016, 02:21 PM   #7
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I have to replace the material for sound and I suspect heat transfer from the engine compartment. The original material is foil faced with a yellow material under that, it has started to fall apart. The marina has some named "Soundown". I would appreciate any reviews on this and any other brands that the members are familiar with. Thank you in advance for your help.

Cork, Cork, Cork.....

Then add Cork...
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Old 08-17-2016, 02:57 PM   #8
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If you're really looking for quiet, start with lead sheeting. Foam works good on bulkheads or walls outside the engine room. On new commercial fishing boat builds, spray in foam is used and sealed behind plywood and fiberglass. Properly done, engines are not heard.
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Old 08-17-2016, 05:18 PM   #9
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Cork, Cork, Cork.....

Then add Cork...
+1 for cork

QuietCORK Cork Underlayment - Acoustical sound control cork
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Old 08-17-2016, 06:40 PM   #10
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I've had really good luck with this stuff and the company is great to deal with.

http://www.soundproofcow.com/product...omposite-wpsa/
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Old 08-17-2016, 07:56 PM   #11
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Cork, Cork, Cork.....

Then add Cork...
Cork looks good but how's the fire rating? We're getting ready to redo our engine room and that question came up about another prduct. I'm just starting to dig into it and the marine insulations all seem be rated. Anyone have any thoughts/suggestions?
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Old 08-17-2016, 08:48 PM   #12
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I don't mean to hijack the post but I have an I/O and the engine cover has no insulation. What should I use in this situation?
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Old 08-17-2016, 08:52 PM   #13
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Cork looks good but how's the fire rating? We're getting ready to redo our engine room and that question came up about another prduct. I'm just starting to dig into it and the marine insulations all seem be rated. Anyone have any thoughts/suggestions?
Fire rating is excellent - you need to keep a torch on it for it to smoulder. You can google it.

I have added a layer in my engine room...
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Old 08-17-2016, 10:08 PM   #14
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Fire rating is excellent - you need to keep a torch on it for it to smoulder. You can google it.

I have added a layer in my engine room...
Thanks. I'll check it out.
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Old 08-17-2016, 10:55 PM   #15
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+1 for mass loaded vinyl. (Or high density vinyl) Nothing compares to it. Im sure this guy has the appropriate solution for you. Call him he was very helpful with my non marine project. http://www.supersoundproofingsales.c...r/products/13/
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Old 08-18-2016, 10:06 AM   #16
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The science of noise reduction leads all manufacturers down the same type design path. A typical vinyl / foam composite insulation will look very similar regardless of who made it and is the most appropriate insulation for most of the vessels talked about here.

The face will be a vapor barrier to protect the foam from absorbing engine room vapors and give it some physical protection. This will be very thin to allow noise to penetrate to the:

Absorption layer, which will reduce the noise in the engine space by not increasing it do to reverberation. The next layer is the

Barrier Layer. This used to be lead, and was used in 1 or 2 lb per sq ft sizes. Lead got too pricey and is toxic so the entire industry switched to mass loaded vinyl, in 1 or 2 lb per sq ft sizes. Works as well as lead, weighs the same as lead, is cheaper and in some ways better. The last layer is:

The decoupler layer. This layer decouples the mass layer from the bulkhead or overhead enhancing the performance of the mass layer as a barrier.

US manufacturers of these products are the previously mentioned Soundown as well as Technicon and American Acoustical. They all make the same style insulation because they all have to abide by the same laws of noise reduction.

There are differences in the grade or quality of the components as well as the laminating process between these manufacturers. Of these 3 manufacturers, Soundown is primarily marine and dabbles in other industries, and the other two are primarily automotive and industrial and dabble in marine.

Wherever you purchase an insulation like described above and looks kind of what's pictured below most probably came from one of these 3 manufacturers.

As for fire resistance, all the components in this type insulation will typically be self extinguishing, but will burn if exposed to an open flame. For incombustible insulation you have to go to fiberglass, ceramic, mineral wool, or exotic materials.

When it comes to noise the rule is simple, more is better. The more stuff you put between you and the noise the more noise will be reduced. Engineered noise products like vinyl / foam composites give the best performance for a given installation space for a reasonable price. The mass loaded vinyl by itself will reduce noise, but not as well as if part of a composite.

Foam or anything soft will reduce noise in the engine space, ant therefore reduce noise throughout the vessel, but because it has little mass will not be a very good barrier.

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Old 08-18-2016, 10:13 AM   #17
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Agree with your post.

I exacerbated a bit on my new build as its not easy to redo.

So I did the following:

1 x Mascoat sound reducing coat sprayed onto the steel
1 x 1" foam/heavy/foam layer
1 x 2" foam/heavy/foam layer
1 x 6mm cork
1 x 5mm perforated white sound absorbing plate.
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Old 08-18-2016, 11:28 AM   #18
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Adding to my post:

I also added 4 extra welded legs on the engine stringers (reduces the vibrations) and used Isoflex engine mounts matched to the engine/gearbox weight.

When doing noise elimination from the beginning then it's a complete package - as one doesn't know how the things work out exactly.

My next "measure" is a Walker Airsep, K&N or similar air intake filter. I think that will be the end of it...I've done my best to silence my Iveco NA engine.....

I expect my engine to be running within 3 month so I will be able to advise if my countermeasures worked......
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Old 08-18-2016, 11:46 AM   #19
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@ Keysdiseas

Your mentioned examples might burn if exposed to an open flame - cork will not...it's cheap, available, fire "safe", noise and thermal insulating..

Is there a another product available out there with these properties?

The density and size of the cork mix is important - so make sure you order the right mix - follow the link that was posted earlier on...

Buy a roll from China, glue it on..
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Old 08-18-2016, 11:56 AM   #20
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I also added a 6mm layer of cork to the underside of all floors towards (facing) the hull...

Cheapest sound and noise insulation available in one package.....(roll)
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