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Coosa Composite Board - Bluewater 26

As low as $110.31
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Key Features:

  • Great Decking and Transom Alternative - Do It Once - Do It Right!
  • Strongest and Stiffest Composite Panel with the Absolute Highest Strength-to-Weight Ratio
  • Consists of Polyurethane foam filled throughout with layers of continuous strand glass and woven fiberglass
  • Over 30% lighter than Plywood with equal superior structural integrity!
  • Absolutely No Water Rot! Mold, Mildew and Algae Resistant
  • 30% to 45% lighter than plywood
  • NO water rot or insect infestation
  • Less than 1% water absorption
  • Mold, mildew & algae resistant
  • NO Special Maintenance Required
  • Sanded for easy lamination
  • Easily fabricated with standard tools
  • Superior resiliency and endurance
  • Transoms
  • Decking
  • Swim Platforms
  • Sun Decks
  • Seating
  • Bench Cores
  • Bulkheads
  • Engine Covers & More!

Coosa Board Frequently Asked Questions

When replacing plywood decking, what thickness should I use?

The Short Answer

Bluewater 26 Coosa Board can be used as an exact replacement for any plywood decking as long as you use the same thickness installed in the same way (i.e. if your plywood was glassed over, so should your Coosa).

The Long Answer

If for some reason you would like to use a different thickness or install the material in a different fashion, there are a variety of things to consider such as:

  • What is the current span width between supports?
  • How is the material installed? (If glassed over, the fiberglass is adding additional rigidity)
  • Is the load spread over a panel or a point load?
  • How is the panel supposed at the edges? Is there a 1/2", 1"...6" overlap?
  • Does the panel need to support an impact load? (Think 300 lb guy jumping off a 5 ft. dock with an ice chest full of beer!
  • How is the board installed? Rigid bonded at the edges or free floating?
All of these factors need to be taken into consideration before a decision can be made on thickness. Boat builders pay a team of engineers to take all of these complex factors into consideration. We therefore recommend leveraging their decision and using the same thickness installed in the same fashion whenever possible.

If you are set on changing the thickness and installation method, please keep in mind that if you make changes that decrease the structural integrity of your deck you will need to make this up somehow. (i.e. if you choose not to fiberglass both sides of the floor, even though your original plywood was, perhaps you need to add additional braces of a stiffener to your span width).

How do I install Coosa Board?

Coosa Board can simply be installed as you would plywood or material being replaced using the same methods and tools.

How do I cut Coosa Board? Can you cut the board to my specific size and shape?

You can cut Coosa Board using any standard woodworking tools. Please make sure to take the same precautions (eye protection, gloves, dust mask, etc.) as you would when cutting plywood.

We are happy to cut your Coosa Board to any required size and shape. Please note that an engineering charge and/or a cut charge may apply depending on the shape of your pattern.

How do I use Coosa Board for decking?

You simply install the Coosa Board as you would plywood using the suggestions above. Many people have simply installed the Coosa Board and adhered carpet directly over the Coosa Board using their favorite adhesive.

Do I have to fiber-glass in the Coosa Board?

You do not have to fiber-glass in the board to prevent absorption of water/liquid; however, glassing the board also adds strength. Therefore, if you choose not to glass in (and your original decking was glassed), you will have to compensate for that loss of strength.

Is Coosa Board UV Stabilized?

Coosa Board is not UV Stabilized. With time, the boards will change color when exposed to sunlight. We recommend that Coosa Board be either glassed over, carpeted over, or painted with a latex or enamel paint.

What types of resin are compatible with Coosa Board?

All typical marine resins work with Coosa Board, including epoxy, vinyl ester and polyester resins.

I see elsewhere online a Nautical Coosa Board. What is the difference and is it available?

Bluewater Coosa Board contains continuous strand glass and woven roven fiberglass, while Nautical Coosa Board only contain continuous strand glass.

Therefore, Bluewater is significantly more rigid and is recommended for all structural applications. If your application is not structural (bulkhead, cabinet, etc.) then Nautical may be a good alternative and more cost effective than Bluewater. Boat Outfitters does not currently carry Nautical Coosa board; however, please let us know if you are interested as we always adjusting our inventoried material.

How does Coosa Board Ship?

It depends on the size piece you are ordering. If you order either a full sheet (96" x 48") or a half sheet (48" x 48"), it will have to ship freight. We are happy to get freight shipping quotes if you will send us your zip code and destination type (either commercial or residential). Please note that with freight shipping commercial addresses are significantly less expensive to ship to.

If you are ordering a third of a sheet (48" x 32"), then your piece can ship UPS. UPS shipping costs will vary based on location but will always be considerably less expensive than freight shipping.

Note: For the price conscious customer who needs a full sheet, please consider having your sheet cut into thirds. (3 pieces - 48" x 32"). This will allow your order to ship UPS and save you shipping costs.

When will my order ship?

Everything listed on the website is in stock available to ship. Our standard lead time is 2-3 days for Coosa Board.

Frequently Bought Together

  1. Coosa Composite Board - Bluewater 26
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  3. Stainless Steel T-Nut
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Total price: $0.00
  • This item: Coosa Composite Board - Bluewater 26 $110.31

5.0 / 5.0
7 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great product
Rebuilt the transom on a Lowes pontoon.
Coosa board was a pleasure to work with.
Highly recommend it.
November 23, 2018
1 month ago
Coosa sandwich
Absolutely love it! Used in place of plywood for a transom on my aluminum boat. Sandwiched it between 2 pieces of 1/8th inch aluminum plate and bolted it in. Stronger and lighter than anything I've ever seen used, easy to work and practically bulletproof when sandwiched!
September 13, 2018
3 months ago
Coosa board, Great product!
The Coosa board is everything that is advertised. It appears to be much lighter in weight, yet as strong as marine plywood. It works easily with cutting tools ands absorbs resin readily.The fact that it will not rot from water or deteriorate is a big plus. I would recommend this product to anyone who wants to do it right the first time!Very satisfied.M. Donathan
September 4, 2018
4 months ago
first look at a new product (for me)
first time I have used it...looks great out of the rigid as I had hoped....will be interesting to see how it 90 degrees together...planning on using 5200....wood angle bracing.... and a few long screws....looks perfect for motor boxes, pilot house wall, etc
August 30, 2018
4 months ago
Coosa, great product.
Replaced the rotten wood in a deck hatch. Two 1” thick Coosa and 4-5 layers of epoxy and woven glass. Lighter and stronger then it came from Ocean Alexander. Easy to use, I’ll use it again.
August 13, 2018
4 months ago
Coolant board
Very light yet strong
June 23, 2018
6 months ago
Transom and stringer
Coosa bluewater 26 is extremely easy to work with, very light and unbelievably strong
Center stringer, three 3/4” pieces of coosa, laminated with 1708.
Fountain Transom
Fountain Transom
December 5, 2017
1 year ago
Questions / Answers
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Browse 45 questions Browse 45 questions and 45 answers
I'm looking to replace the plywood transom on my 10' inflatable boat. Can Coosa board be used as a substitute? If so, what type of adhesive would be best ?
Bill Brousseau on Jul 21, 2017
BEST ANSWER: Coosa board is ideal for transoms, and most high end boat builders have gone to Coosa for the long term durability & weight savings.

It's very easy to work with (although you'll want some gloves and a mask because it does have fiberglass in the sheet). Alternatively, if you wanted to send us a template, we can cut a piece for you to the exact size/shape of your transom.

Regarding adhesives, I've linked directly to Coosa's recommended adhesive list -
I'm Replacing the aft center floor deck of my 1981 Ski Natique. The motor cover bolts to the deck via hinges. Is the coosa board going to resist the amount of pressure that could be applied there?
Shane A on May 20, 2018
BEST ANSWER: Great question Shane!
The Coosa Board doesn't quite stand up to standard screws the way wood does, so if you through-bolt the hinges instead of a standard screw you shouldn't have any issues with the Coosa Board.
Can you get the coosa board custom cut to a specific size?
A shopper on Apr 1, 2018
BEST ANSWER: Great Question,

We can most certainly take care of that. You will need to give us a call in order to get this taken care of.

Can this be used for a swim platform?
A shopper on Feb 1, 2018
BEST ANSWER: This material can be used for a swim platform, but it is a raw material. You will likely need to fiberglass the board for additional rigidity. If this isn't necessary, you will still need to cover the Coosa to protect users from the fiberglass in the material.
can coosa be cut into 2” wide strips and layered to make supports for a coosa deck?
A shopper on Jan 4, 2018
BEST ANSWER: This certainly sounds like something that can be done, but we could not tell you from experience. You will want to make sure to fiberglass all the way around the supports to get the full rigidity you are likely looking for. Thank you!
I’m looking to replace a 1.5 in thick plywood transom on a late 70s Starcraft aluminum boat. Boat is rated to a 140 hp motor but transom is failing with 115 Yamaha 4stroke. Already replaced the transom about 15 years ago, so figuring I need to beef it up a bit. Was considering taking a piece of 1” ply and coating it with fiberglass. The splash tray is screwed to the inside of the transom and definitely adds some structural support. Would coosa board still have enough “screw hold” for this application. I would love to not have to do this project again. Any advice? Thanks.
Nordie on Jan 3, 2018
BEST ANSWER: Hello, Cossa is an excellent material for transom replacements it is typically recommended to us the same construction method and material thickness as what was originally used by the manufacturer. As for screw retention, Coosa does not hold screws, not quite as well as plywood but depending on the project there are some options available. If you would like to discuss your project please feel free to give us a call and we would be happy to talk through your options with you.
Is this being used in floors or aluminum boats in Half inch thickness or is it not rigid enough. Thank you
Brian earley on Jul 22, 2017
BEST ANSWER: Hello Brian, that is a great question. It is always recommended to use the same thickness as the plywood the Coosa would be replacing. If you are adding this floor from scratch the thickness needed would really depend on how it it is supported underneath. If you would like to discuss the specifics of your project please feel free to give us a call and we can go over some options for you.
I am using Bluewater 26 to replace my soleboards on my sailboat. The old material is 5/8 plywood with 1/16 veneer. The spans between stringers supporting the boards are max 2ft. I would get best material use from the 5x12 sheets but since they don’t come in 5/8, will 1/2 inch support a 250lbs between 2 ft spans?
Scott on Dec 5, 2018
BEST ANSWER: Hi Scott, That is a great question! Coosa Composites recommends replacing existing panels with exactly the same thickness, just out of Coosa panel instead of plywood. Ideally for you it would be a piece of 5/8 inch Coosa panel which most likely is fiberglassed on both sided for rigidity considering a 24" stringer gap is quite large, but not unheard of.
The problem, which you already understand is that we do not sell 5/8 inch Coosa panel. Your safest route to get more accurate answers to your question on support is to contact Coosa composites directly. You can find them in the link below:

They would be able to better address what your best option is in terms of rigidity and material thickness. We do not want to give you the wrong information! If you have any other questions or concerns please do not hesitate to reach out to us at 866-633-7961. Thank you!
Can the 1/2" Coosa board over a 6ft span be bowed with a 1.5" camber in the middle?
Douglas R on Oct 11, 2018
BEST ANSWER: This really is a great question. Coosa Composites says that the material should not be bent, but we have seen applications where the coosa has been clamped and installed to a very slightly curved surface over a long distance (this can be seen in the Ship Shape transom installation video on our website There would be more stress on the board as a result of the curve, but it is likely possible that you can get the desired curve you are looking for. We cannot say that Thank you Doug!
Can this be used for replacing the decking on a pontoon boat?
Amyashworth on Sep 9, 2018
BEST ANSWER: Great question. Yes, the Coosa board would be perfect for this application. Please feel free to give us a call to discuss your project.
I'm looking to replace the core material on 1976 cj-5 jeep body. Can I assume this product is a good option? There was 1/4" end grain balsa on all the floor surfaces, and an additional 1 1/2" at the body mount areas.
Ryan B on Aug 30, 2018
BEST ANSWER: Hi Ryan, Coosa board is a great option for replacing wood, especially in structural areas. However, I cannot tell you that this is the best option for you cj-5 body. The smallest thickness available is 1/2", but the 1.5" coosa should work well around the body mounts. Thank you!
I want to replace some large wood lazzerette covers on my boat. They double as a standing and seating area. Can I use 1" Coosa coated with fiberglass for this purpose? As the covers are about 4'x2' will I need to add structural ribs on the underside to prevent the Coosa from cracking? I also need a 4 inch face lip can i glue the coosa or screw it together prior to glassing?
Eric J on Aug 14, 2018
BEST ANSWER: Hi Eric, good questions! 1" coosa should work well for this, especially if you are glassing it and adding structural ribs. You might even get away with 3/4" on this. You can certainly glue this material, and Coosa recommends using a two part epoxy from scotch weld, but if you will be glassing the material, you might just glass on your lip as well. For more info on this please reach out to us at 866-633-7961. Thank you!
Dose it come in1/2 “?
William K on Jul 29, 2018
BEST ANSWER: Great Question William,

This product does come in 1/2" thickness. On our website page, you can view the many different thicknesses and size variations by choosing them from the two drop-down menus.

Thanks William!
I have a 1994 16' bass tracker and am considering replacing the floor and all other plywood, looking for my best long term option. what info would you need for an estimate?
Artie R on Jul 14, 2018
BEST ANSWER: Great question! Coosa is a great long-term alternative to plywood. Please give us a call to discuss the specifics of your project for a personalized quote.
I'm planning on replacing some floor panels on my bass boat. Is it easy to carpet over Coosa?
WillieBeamin on Jul 10, 2018
BEST ANSWER: Hello Willie, you can definitely carpet over Coosa, I would recommend using an adhesive to hold the new carpet on the Coosa. You can still use any of the same adhesive and installation methods that you would use if you were to replace it with plywood.
I have an aluminum boat and looking to replace the transom. It would be in the pnw and curious if it would with stand the rain.also since it’s aluminum do I need to epoxy it?
Jholly on Jul 4, 2018
BEST ANSWER: Hello Jack, Coosa would be a great material anywhere there was originally plywood. It gives you the same strength and you can use the same construction methods as wood but it will not absorb water or rot It is recommended though that you cover the material in some way to keep it form discoloring. If you would like to discuss the specifics of your application please fee free to give us a call and one of our sales associates would be happy to assist you.
Is this strong enough to stand on? I want to build a T-Top and I'm considering using this as the floor.
Thank you
Ricardo B on Jul 1, 2018
BEST ANSWER: Hi Ricardo, With proper bracing this would be fine to stand on. Thank you for your inquiry.
Can you fiberglass to Coosa composite board?
Chris L on Jun 29, 2018
BEST ANSWER: Great Question Chris,

You can fiberglass to Coosa board. Often times this product is fiberglassed into transoms and structural stringers on power boats.

Thanks Chris!
'Replacing a 3/4" marine plywood pontoon boat deck, would the coosa board work? Howard
Howard S on Jun 25, 2018
BEST ANSWER: Hello Howard, Coosa is an excellent replacement for any area that you currently use or would use plywood. It has the same structural strength but is 30% lighter and will not absorb water so you would not have to worry about rot moving forward. If you would like to discuss the specifics of your project please feel free to give us a call and one of our sales reps would be happy to assist you.
I have a Dargel scooter that has a transom that rises and lowers the outboard according to the depth of water we are in. With this board by strong enough to support my outboard ( Yamaha 50 ) in this situation since it would be free floating and not bonded to anything?
Mark M on Jun 4, 2018
BEST ANSWER: Great Question Mark,

This product is designed to be a replacement for Marine plywood. From the pictures that we have seen online, it looks like the Cossa would work for your application. But, the Coosa would need to build in the same way it was originally manufactured.

Thanks Mark!
will the material float good?
elvis on May 12, 2018
BEST ANSWER: Hi Guion, Absolutely Coosa Board will float! It's significantly lighter than water, so it has a high buoyancy and will float
Can I use this for the bunker boards on the trailer?
Big Dog on May 10, 2018
BEST ANSWER: Hello Michael, Coosa can be used anywhere you would normally use plywood. If you had plywood bunks previously you can definitely use Coosa to replace those. If you had any other questions regarding your specific project I would recommend giving us a call to discuss it by phone.
Can you ship a sample of the coosa board? Thinking of using it as the flooring on an Airstream renovation instead of plywood.
David B on May 9, 2018
BEST ANSWER: Hello David, we actually do have Coosa samples available on the site, I can include a link to those below for you.
Is there a
possebillity to make larger dimensions?
Hugo V on Apr 29, 2018
BEST ANSWER: Hello Hugo, that is definitely something we can look into for you, I would suggest giving us a call so we can discuss your project needs and see what options we have available for you.
I would like to use this product to replace the wood on my upper deck of my pontoon. It measures 12' x 8' with bracing ever 2'. How would the decking assemble (tongue and grove, adhesive), can carpet be glued to it?
Mark W on Apr 15, 2018
BEST ANSWER: Hello Mark, you would work with Coosa the same as if you were working with plywood. Given the spans you would be covering and the material only coming in 4 x 8 sheets I would suggest giving us a call to go over the specifics of your project.
A common problem on pontoon boats is the laminate on plywood deck is destroyed when removing old carpet. Would Coosa board have similar problems if the carpet or vinyl had to be removed and replaced? Thanks in advance...Rick
Rick B on Apr 8, 2018
BEST ANSWER: Great Question Rick,

It should not pull apart like laminate on plywood. With any project, you will want to be careful when replacing the surface of anything.

Can I paint the board well? Does it hold paint and who is the process?
A shopper on Apr 8, 2018
BEST ANSWER: Great Question,

This product can be painted. If you are looking to have a glossy smooth finish you will need to use a high buildup primer. But other than that you can paint it like you normally would paint wood.

I'm looking to redeck the floor on my 28' pontoon, would this product be good for this project? About how much would it cost for the material to do this project?
A shopper on Mar 20, 2018
BEST ANSWER: Great Question,

This can work as a deck on a pontoon boat. But It would need to be finished with fiberglass or carpet. In regards to how much it would cost we would need to know the model of your Pontoon boat and or the width of the vessel in order to help you find the cost.

Can this be used for boat deck and if so how do you cut and mount?
A shopper on Mar 17, 2018
BEST ANSWER: Great Question,

This product can be used as a boat deck. The best way to mount it would be to fiberglass it in place.

Would this coosa board be good for stringers in a boat ?
A shopper on Mar 8, 2018
BEST ANSWER: Great Question,

Yes, Cossa board is designed to be used as stringers and transoms for boats.

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