Coosa Composite Board - Bluewater 26

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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.
5.0 / 5.0
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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
3 months ago
Questions / Answers
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Browse 18 questions Browse 18 questions and 18 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 -
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.
swim platform?
Jason D on Feb 11, 2018
BEST ANSWER: Great question. Coosa is excellent when used in decking applications. However, it is recommended that the final product is fiberglassed over for best results.
Screw hold?
Jason D on Feb 11, 2018
BEST ANSWER: Great question. Screw retention in Coosa board is not quite as good as it is in plywood. If you are screwing through the Coosa into another material that the screw can bite into you would generally be ok. However, it is recommended that if you are mounting directly to Coosa use of either a through bolt or a tee nut. Please feel free to give us a call if you have any other questions or if there is anything else we can do for you.
I am replacing an old plywood firewall in my boat would coosa board be a good use for this?
MIkeG on Feb 10, 2018
BEST ANSWER: Great question. Coosa board would most likely be excellent in this application and we would love the opportunity to discuss the specifics with you on this. Please feel free to reach out to us for more information and get started.
My sailboat does not have floor timbers. I am looking at adding wood timbers running side to side, and bolting the keel (using stainless "L" brackets) to the floor timbers, then glassing the timbers to the hull. Would Bluewater Coosa Board work for that?
Charles Shaw A on Jan 29, 2018
BEST ANSWER: Hi Charles, this sounds like something that Coosa could work for. I do believe you will want to reinforce the coosa, as you would do with wood, by fiber glassing all the way around the material. Thanks Charles!
Can I get a piece of 1-1/2x52"11" without having to buy a whole sheet?
Mark H on Jan 27, 2018
BEST ANSWER: Hi Mark, great question. Because your longest dimension is over 47.5", you would be required to purchase the full sheet of material. Thank you!
Can I glue 2 pieces of 3/4 to make 1-1/2? And what kind of adhesive do I need
Mark H on Jan 22, 2018
BEST ANSWER: Hello Mark, yes you can bond the 2 pieces with adhesive. Coosa is really a direct replacement for plywood so you would work it the same way as if you were working with wood and use the same construction methods. If it were me I would use thickened epoxy to bond the 2 pieces but you can use any adhesive or resin that you would use on wood. I hope this helps and please feel free to reach out if there is anything else we can do for you.
Screw retention?
A shopper on Jan 8, 2018
BEST ANSWER: Hello, screw retention in Coosa is not as good as it is in plywood. if you are screwing through the Coosa into another material that the screw can bite into you would would usually be ok but, it is usually recommended that if you are mounting directly to Coosa to use either a through bolt or a tee nut. Please feel free to give us a call if you have any other questions or if there is anything else we can do for you.
I have a 2003 Suntracker Party Cruiser (32 foot) pontoon boat with laminated walls. The original walls are laminated plastic, wood veneer, and styrofoam. They have de-laminated badly and are no longer in production. Is Coosa Composite board a viable replacement? If not, what would you recommend?
David P on Dec 31, 2017
BEST ANSWER: Hello David, Coosa could work for you depending on how you would like to finish them but we may have some other material options available. I would suggest giving us a call and one of our sales associates can try to find a product to meet your needs.
Can you use Coosa boards for a pontoon boat, the underside will have water splashing against it?
Tom H on Dec 26, 2017
BEST ANSWER: Hello Tom, Coosa is a great replacement any where that you would use plywood, it will not absorb water or rot and is close to 30% lighter than plywood so that should work very well for you. You would want to use the same thickness as the plywood that was originally installed and finish at least the top with something to protect it from UV. They say that structurally UV will not damage the material but it will discolor if left exposed to direct sunlight.
Can you custom-cut this product to fit my transom if I provide measurements/specific drawings of the shape and thickness I need?
C L on Dec 15, 2017
BEST ANSWER: Absolutely! If you give us the dimensions and a template then we can let you know for sure. Thanks!
Is this slick when wet? Do you need something else covering it for a boat deck application?
Aaron C on Nov 29, 2017
BEST ANSWER: Hello Aaron,

Coosa is designed to be used as a direct replacement for wood applications. You would want some type of covering or coating on it once installed if it was used for decking. If you have any other questions about using Coosa please feel free to give us a call and we would be happy to assist you.
I would like to use this board as a bulkhead on a sailboat. The bulkheads on my boat or not tabbed into the hull they are screwed in to the bottom of the hull. Do I still need to encapsulate this in epoxy?
Gman377 on Nov 24, 2017
BEST ANSWER: Coosa recommends using the same thickness and construction method as what was originally installed. I will say that screw retention is a little better in wood than in Coosa so I would recommend finding some way to fiberglass them into place.
What thickness should b in 16 ft long flat bottom aluminum boat?
A shopper on Nov 5, 2017
BEST ANSWER: The material is stronger and more rigid than plywood. Due to variations in distance from support to support, we recommend using the same thickness as the material being removed from the boat.
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