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Building a boat on your own can be an abashing task, especially without professional guidance or instructions. With the correct procedure and tools, an ideal DIY cardboard boat can be prepared to provide an impressive experience. People also make their own cardboard boats to take part in regatta races. Following the instructions in the article below, you can prepare a standard cardboard boat that will suit your requirements well.
Things to Gather
The materials used in this guide are based on the rules of the cardboard boat regatta. The standard list of materials that one will need to prepare a cardboard boat is mentioned below.

- Cardboard Pieces
- Wood Glue
- Pencil
- Paintbrush
- Duct Tape
- Knife or Razor
- Measuring Tape
- Varnish
- Scissors
- Glue Applicator
- Manila Folder
Factors to Consider Before Building a Cardboard Boat
A few essential factors make the construction of the cardboard boat successful. Below are the considerations one should make before constructing a cardboard boat.
1. The Design of the Boat
Depending on the requirements, any suitable type of boat can be chosen as the functional boat design. However, a flat hull over a v-hull is recommended as flat-bottom ships are more stable than v-hull boats, especially in still or calm waters.
2. Measurements
Determining the dimensions of boats may not be needed if you use a boat design. Nevertheless, as a first step, determine the number of passengers sitting in the boat and calculate an estimated total weight.

A boat shorter than 10 feet creates difficulties in steering, and it is more prolonged than this; it is more challenging to steer as well. One can try for 8-9 feet in length for the cardboard boat.
Furthermore, a height between 10 and 18 inches provides enough space to spread arms and paddle. At the same time, a width of 20 to 32 inches is ideal for a standard-sized boat.
3. Determine Buoyancy
Buoyancy is calculated to ensure that the boat does not sink after taking up a particular load. Firstly, compute the volume of the boat, which is length x breadth x height in feet. It will provide the volume of the boat in cubic feet.
While calculating, ensure that all the dimensions are in the same unit, which is feet.
Steps to Build a Cardboard Boat
Following are the standard steps to build a DIY cardboard boat, which must be followed in conjunction with a detailed boat design you have chosen:
1. Prepare the Materials
Gather all the materials in sufficient amounts. Always refer to the design to determine the number of cardboard sheets needed to build a cardboard boat. Some boat designs use dual layers of cardboard.

Ensure that the cardboard pieces do not have fold marks and are in a fresh condition to prepare the boat.
2. Build a Miniature Model as per Measurements
Building a miniature model of the boat is a good idea to avoid later issues. List the measurements of the ship according to the design and make a small model based on calculations with a manila folder.
Put the miniature boat in the water with a few rocks on it to measure its buoyancy. If the boat does not sink and floats properly on the water, then get ready to make a full-sized cardboard boat.
3. Cut the Cardboard
Marking on the cardboard is a crucial step, as some markings need to be folded, and some will be cut out. Another suggested way instead of marking is to use a diagram sheet or reference paper to trace over and cut out without markings.

After cutting the necessary large pieces, join them with tape and support them with other materials, like glue.
4. Put Small Cuts and Make Folds
If you are making a complicated design, you will need to make smaller cuts and folds. Try to use as few small pieces of cardboard as possible. It is better to use small flaps and folds nicely rather than small pieces to build it.
Attaching small pieces to larger pieces of cardboard provides a better integrity to the overall structure.
5. Building Structure
Based on the design you have chosen, begin assembling the hull. Assemble the more significant pieces using glue and tape, but hold them together with clamps. Screws can also be used to keep the boat together, but remember to discard them later and patch up the holes.

Some designs use the boat skeleton to support the DIY boat. However, pieces of cardboard placed horizontally to create compartments support simpler designs.
These compartments help keep a boat afloat. Adding more compartments can help build a better leak space without sinking the boat.
6. Seal the Gaps
After finishing large pieces and preparing the entire boat structure, it’s time to seal the gaps and small holes in the boat. Using duct tape to seal the patches is better than using a sealant.
Edges of the cardboard are likely to get filled with water even when the boat is not submerged in water. Sealing the edges of the cardboard is suggested. A raised ship’s bow makes it better, but paying close attention to it is recommended. In the case of a boat with a top layer, seal it and attach it to the ship.
7. Give the Final Touches
Giving final touches to the boat involves painting on it. However, only one part of the paint should be used to avoid wetness. Using varnish is a safer option but may not give the boat a decorative look.

Complete the boat’s decoration, but remember to seal the edges of the paddles if you also constructed them.
Final Touches
Making a DIY cardboard boat is a difficult task but not impossible. You need to have all the essential tools while ensuring the one thing that the measurement of dimensions is perfect. Another thing to remember is the boat’s buoyancy, which ensures the ship does not sink after acquiring its load. However, there is no need to worry; you can prepare a cardboard boat by following guidelines and putting in a little concentration.
Last Updated on by Janhavi Ramesh Kowligi