Catamaran Stand Up Paddle Board (SUP)





Introduction: Catamaran Stand Up Paddle Board (SUP)

About: I like making things.

This is a fiber glass catamaran stand up paddle board or simply SUP. SUP boards are more related to a boat like construction rather than a surfboard. The sport of stand up paddle boarding came about in the era of surfing. It is a much larger board used along with a paddle in a standing fashion, to explore, race or surf. The shape and weight will be more determining of what the board is suitable for. This particular model I designed for a fast, long distance, touring style. My board is 12'6" long by 28" wide and weighs around 30-32lbs. The catamaran shape is great for a more stable board. I have not surfed with it as of yet and it is not suitable for a race that has many turns due to the lack of surface area in the rear (the method used to turn a sup is shifting the weight to the rear, raising the nose). Hope you enjoy! Btw:  Eventually I would like to create these completely hollow. If you like what you see, I would appreciate any help. Below is a link on how you can help. Thank You!!!

Step 1: Foam

Buy Blue insulation foam. Panels are 4x8 feet and about $14. You will need 3-4.

Step 2: Cut Foam

Once you have traced a design you like, sketch it on the foam. Measure twice cut once!!

Step 3: Place Pieces Together

Before any glue is used, place the pieces together to make sure they fit correctly.

Step 4: Glue

I used water resistant glue since it will be glassed later anyway.

Step 5: Cut Upper and Bottom Parts

Once the basic shape is glued and pieced together you will need to make the top and bottom of the pontoons.

Step 6: Glue

Once it is fitted and glued. Begin shaping. I used 150 grit sand paper.

Step 7: Second Pontoon

Repeat the steps for the second pontoon.

Step 8: Middle Piece

Join the two pontoons.

Step 9: Deck

Add a deck to stand on.

Step 10: Shape

Shape using sandpaper. Take your time.

Step 11: Get Rid of 90 Deg Corners

I added a rounded edge underneath to ease with glassing.

Step 12: Glassing

Add fiber glass. Use two part epoxy.

Step 13: Add Fin Boxes

After adding 2-3 layers of fiber glass prepare fin boxes. Research angles for the size you are building. Also add any leash holds or net holds at this time.

Step 14: Paint

Design a color scheme and begin painting base color first.

Step 15: Design

Continue with your design scheme. I chose a post apocalyptic look.

Step 16: Glass/epoxy

You can finalize with a thin 4oz fiber glass to seal the images or glass with epoxy alone. Add the epoxy with a brush and add 3 layers total. Let the epoxy sit for 3 hours exactly before its cured to add the next layer.

Step 17: Help Support Us!!

ATTENTION EVERYONE!! I have launched a small campaign to fund my company PH822 Composites & Design. Please checkout the link below for a chance to purchase a high quality T-shirt with my logos on the front and back. I have 21 days to meet my goal of 282 shirts (but I can go above)!!!!! Please share at the very least!!!



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    46 Discussions


    I have a few questions:

    What kind of fiber glass did you use? (I mean: How much the weight of it?)

    How many layers of fiber glass did you use?

    thanks, vakrep

    So did you vent it? Seems like it might explode being hollow like this. Did you ever get a solid weight range figured out on this. Surely with the volume dimensions and lack of weight it would hold in the 200lb range.

    The only question I really have is what did you use for glue and how many tubes did it take? I've heard gorilla glue works well for this application and comes in tubes. Is glue expansion not a problem with the flexibility of the foam?

    Thank you LeslieP7

    Foam 1" thick

    What thickness of foam board did you use?

    Now this is pretty cool. This is the first I ever ever seen designed like this. If this works, I'm sure it will be the next "big thing" on the water.

    I just purchased a SUP from They may be contact for you if this Catamaran SUP works.

    Good Luck!

    .... Ummm I'm sorry I don't speak Russian

    Was about 30lbs

    пенопласт от эпоксидной смолы плавится, как решили эту проблему?

    2 replies

    эпоксидной смолы не плавится накладки из пеноматериала

    Убедитесь, что вы используете морской эпоксидной она лучше всего работает с набивкой из пеноматериала

    Haha. Well Thankfully when I was younger my parents were ok with house projects. I've been playing with composites since the age of 20 so about 12 years now. My apartment is a little small for housing projects but I do what I can. I currently have a launched T shirt campaign for my company to get a little head start and will be launching a kickstarter campaign soon. If your interested in helping our company grow please visit and at the very least please share!! :)

    This is is great! Wish my parents would let me make something like this! And great paint job. Love it!

    Ps use a new razor

    The dimensions are 12.5 feet in length by 28" wide. Each hull is 8" wide and the space left between will be 10". The thickness at the nose begins with 7.5-8" and tapers down to 5.5" at the center, down to 4" at the tail end. The cutting was done by marking both sides of the foam equally and then cutting half way in from both sides. This way you have a straight line on both sides. The final shaping was done by hand and a keen eye ;) lol. Hope that helps. Please share our site. We are starting a composites company and we have t shirts available and a goal of 282 sales by the end of 2 weeks and 1 day now. Thank you.

    love this indestructible! Any way you could post details of how you cut the foam and the dimensions?

    Shirts for sale and to help support PH822 Composites. I added two pictures at the end of this instructable. FYI you will not be charged until I meet my goal of 282 shirts at the end of 21 days. So please share and help support us.

    I don't know haha. It's not really made to be motorized....