Coosa Board

Coosa Board is high-density polyurethane foam with reinforced layers of fiberglass. It is truly the premier decking & transom material in the marine industry. There is a reason boat builders put "Certified Coosa Board" decals on their transom! » Read More

Learn More About Coosa Boards


What is Coosa Board?

 It's a no-rot composite sheet material primarily used for coring and decking applications.  It’s composed of high-density polyurethane foam reinforced with layers of woven roving and continuous strand fiberglass. It’s structurally superior, doesn’t absorb water, and weighs 30-40% less than marine plywood.

Advantages of Coosa Board

  • 30%-40% 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 woodworking tools
Coosa board being used to replace the transom in a 1978 Alumacraft bass boat.

Limitations of Coosa Board

Coosa is ideal as a coring material but does have a few limitations. It’s not UV stabilized and will discolor if exposed to direct sunlight; it won’t deteriorate structurally but will become chalky and washed out. Read More

What Are Popular Uses?

Coosa is great for structural applications such as:


With 11 CNC Routers and a design team at the ready, all you need is to send a drawing with dimensions or template for your project to Boat Outfitters and let us take the lead. If you’re more of a do-it-yourselfer Coosa composite board is easy to work with using common woodworking tools and can be ordered in third, half, and full sheets.

Our full sheet size is 48” x 96” which is large enough for most projects. If your project is bigger than 96”, like an oversized transom, don’t worry - we can use a puzzle joint to connect two panels for your exact size needs.

Contact Us

If you’re having trouble finding the exact part you're looking for, the best first step is to take a picture and give us a call.

Our customer service team is here Mon-Fri 8am - 5pm and would love to help you track down the exact hardware you need.

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Commonly Asked Questions About Coosa

When replacing plywood decking, what thickness should I use? (show/hide)

How to install Coosa Board? (show/hide)

Do I have to encapsulate the Coosa in fiberglass and resin? (show/hide)

What types of resins are compatible with Coosa? (show/hide)

What thickness and sizes are available? (show/hide)

How do I cut Coosa panels? (show/hide)

Can Coosa Board get wet? (show/hide)

Can Coosa Board be bent? (show/hide)

Can Coosa Board be shaved down or shaped? (show/hide)

Can you paint Coosa Board? (show/hide)

Can you fiberglass Coosa Board? (show/hide)

Can Coosa Board be used for boat stringers? (show/hide)

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