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need recommendations for deck sound reduction material
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Domino
#1 Posted : Monday, May 11, 2009 12:30:28 PM(UTC)
Domino

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I am redoing my cockpit deck of my 32' M Express.........using 3/4" BC fir Marine plywood ....will use a rubberized non-slip paint on the topside.....what to put on the underside to help with sound proofing as the three panels closest to the helm are over the engines.. The old panels have a foam made of expanded polystyrene beads..........

One idea is Dow Styrofoam is blue, is extruded polystyrene and has a fire retardant added to it...

Any other suggestions???

Domino is on the hard @ Pier 500 Marina, Wyandotte, Michigan
** 67 32' Express
** Ford 302's
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shsteev
#2 Posted : Monday, May 11, 2009 1:24:42 PM(UTC)
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Al,
I have just finished redoing the entire deck on our 28 express and used a product called armaflex.It is used in insulating air conditioning duct work and refrigeration lines.I used it because I found out it is a closed cell foam that will not mildew or mold and it will prevent the new aluminum decking I installed from condensing when the humidity and temperature change.It also is a good sound insulator.I am not sure how well it would work on wood but I personally think it would work great.I bought 3'x4' sheets 1/2 inch thick and glued it with a contact cement.Try and get it through someone that is a contractor that can buy it wholesale at Johnstone supply a refrigeration supply house or similar place.
good luck with it .
Steev
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jralbert
#3 Posted : Monday, May 11, 2009 4:19:13 PM(UTC)
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Two major factors in sound transmission & insulation are air and direct contact between materials. Third would be the sound "barrier". If you make the separation between the engine room and the living quarters as air tight as [practical (think some type of gasket around hatches, etc), you'll eliminate lots of sound leakage. If you can keep the wood floor from directly contacting the support structure you will eliminate more sound conduction that occurs via vibration.
Both solutionsare easy and cheap. In the latter, a thick washer surrounding every screw will help. Or, glue down some rubber strips, perhaps 1/8" thick over the support grid before installing the floor. DOn't make it too quiet or you'll miss the sounds of engines in trouble.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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dougrose
#4 Posted : Monday, May 11, 2009 11:31:27 PM(UTC)
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Because I have diesels, I am an expert in noisy engines.

I used self-stick sound insulation from Hamilton Marine. It is expensive, but works very well. I used 1/8" aluminum "L" screwed to the bottoms of the decking around the edges, so that there would be protection for the insulation when the deck section is out, and used aluminum tape to seal between the aluminum "L" and the insulation itself.

This stuff is so effective that it cuts down the reflection in the engine compartment and really shuts things up. http://store.hamiltonmar...browse.cfm/4,11634.html

1/8" Rubber foam tape under the edge of the floor panel where it touches the aluminum frames reduces the noise quite a bit. You can get good stuff from McMaster.com.

As jralbert notes, none of this is effective unless you seal the engines off from the cabin properly.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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ComputerJoe
#5 Posted : Tuesday, May 12, 2009 12:33:44 AM(UTC)
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What do you guys do for the bilge? The area from the top of the longitudnial stiffiners and the hull would be damp at best and should be allowed to drain forward as our boats want to do.

I have an I/O so my single engine is in back by the transom. This allowed me to box in the area but I left the area along each shear and the bilge open because of the problem of trying to cut the ply to match and the water in the bilge would make short work of the ply.

I have some reflectix and some more black foam left over from a hospital construction project. Thought I would put the reflitix on the inside and the black stuff on the outside of the plyboard.

BEFORE using DOW board splash some gasoline on it and check the results. It will melt it away very fast, to fast to run and get a rag to wipe it.
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AlumiJim
#6 Posted : Tuesday, May 12, 2009 12:47:39 AM(UTC)
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I agree with Joe regarding the blue Dow board. Fire retardant doesn't mean fire proof and I could be wrong, but I believe none of the rigid foam boards are rated for use without being covered up, such as with drywall in your basement.

Hamilton's price is good and the flexibility of the product is a plus for installation.

I don't know how many of you already subscribe, but Hamilton's advertises in Boats and Harbors, the publication for buying and selling in the "professional marine" world. I look forward to the latest copy in my mail and spend hours poking through the ads. It's a good source for finding suppliers.

http://www.boats-and-harbors.com/

JIM




JIM
Alexandria, VA
1989 32' Sedan
'Gammelby'
Friendship, MD
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