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Author Topic: Will this Coosa Board work?  (Read 162 times)

November 09, 2019, 07:20:09 AM
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Capt.Joe

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Will this Coosa Board work?
« on: November 09, 2019, 07:20:09 AM »
I came across a good deal on 3/8” 20lb density Coosa Board and was wondering if this would be sufficient for my boat floor? My take on it was that it should be stronger and lighter than the 1/2” marine plywood. Any feedback would be appreciated.

November 09, 2019, 08:11:00 AM
Reply #1

mshugg

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Re: Will this Coosa Board work?
« Reply #1 on: November 09, 2019, 08:11:00 AM »
What boat?  What are your distances between supports?  3/8” is a bit thin for a floor.  Coosa recommends that you use the same lamination thicknesses as in the original boat.  I believe most AquaSport’s used half inch cores in floor. 

You can probably get away with 3/8”, but you will probably need to use mare glass in the skins most likely offsetting any cost savings.  Keep in mind that with any cored construction, the thickness of the core is important for stiffness and strength.

November 09, 2019, 09:29:58 AM
Reply #2

Capt.Joe

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Re: Will this Coosa Board work?
« Reply #2 on: November 09, 2019, 09:29:58 AM »
What boat?  What are your distances between supports?  3/8” is a bit thin for a floor.  Coosa recommends that you use the same lamination thicknesses as in the original boat.  I believe most AquaSport’s used half inch cores in floor. 

You can probably get away with 3/8”, but you will probably need to use mare glass in the skins most likely offsetting any cost savings.  Keep in mind that with any cored construction, the thickness of the core is important for stiffness and strength.

It’s for a 74’ 22-2. I haven’t started on my bulkheads yet and won’t know exact distances between supports. Buying it at this price should save me about $500-$700 dollars, but you get what you pay for.

I figured it would be better than marine plywood but not as durable as the Bluewater Coosa. It is the Nautical series coosa board.

November 09, 2019, 11:48:18 AM
Reply #3

mshugg

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Re: Will this Coosa Board work?
« Reply #3 on: November 09, 2019, 11:48:18 AM »
The 20 pound density isn’t the problem.  At 20 pounds it’s four times denser than h80 divinycell that is commonly used for decks.  It’s the thickness that will limit you.  Now if you could double it up, so your thickness is 3/4” it would make an awesome deck core.  Of course the bond between layers is critical.

November 09, 2019, 12:30:25 PM
Reply #4

Capt.Joe

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Re: Will this Coosa Board work?
« Reply #4 on: November 09, 2019, 12:30:25 PM »
Thank you for the feedback mshugg! In reality I know a 1/2” deck would let me sleep in peace, but my wallet keeps saying, “It’s only a .125” difference”.

November 09, 2019, 08:34:34 PM
Reply #5

BradC

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Re: Will this Coosa Board work?
« Reply #5 on: November 09, 2019, 08:34:34 PM »
Thank you for the feedback mshugg! In reality I know a 1/2” deck would let me sleep in peace, but my wallet keeps saying, “It’s only a .125” difference”.
Yip ... but it equates to a 33% difference

November 13, 2019, 07:17:36 PM
Reply #6

Tampa Bay Mike

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Re: Will this Coosa Board work?
« Reply #6 on: November 13, 2019, 07:17:36 PM »
I used the 20lb coosa in 1/2". I did one layer of 1708 on the bottom and two on top and it's plenty stiff with the bulkheads I used. I think you could get away with it but I would add at least one more layer of glass. My question would be is the cost savings enough to offset the extra glass and resin and still be a good deal? If so, I'd do it.

November 13, 2019, 09:18:32 PM
Reply #7

Capt.Joe

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Re: Will this Coosa Board work?
« Reply #7 on: November 13, 2019, 09:18:32 PM »
I used the 20lb coosa in 1/2". I did one layer of 1708 on the bottom and two on top and it's plenty stiff with the bulkheads I used. I think you could get away with it but I would add at least one more layer of glass. My question would be is the cost savings enough to offset the extra glass and resin and still be a good deal? If so, I'd do it.

Thank you, Mike. I think the savings would be enough to offset the extra glass. How many 4’x8’ pieces did you need to use for your floor?

November 14, 2019, 07:12:53 AM
Reply #8

Tampa Bay Mike

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Re: Will this Coosa Board work?
« Reply #8 on: November 14, 2019, 07:12:53 AM »
I used the 20lb coosa in 1/2". I did one layer of 1708 on the bottom and two on top and it's plenty stiff with the bulkheads I used. I think you could get away with it but I would add at least one more layer of glass. My question would be is the cost savings enough to offset the extra glass and resin and still be a good deal? If so, I'd do it.

Thank you, Mike. I think the savings would be enough to offset the extra glass. How many 4’x8’ pieces did you need to use for your floor?

I used five total. Three for the sole and two on the casting deck and had enough left to make the bulkheads.