
Owning a fiberglass boat comes with its own set of maintenance requirements, and one of the most common issues faced by boat owners is the need to replace the wood floor due to damage or rot. This process can be time-consuming and labour-intensive, often requiring the removal of the entire deck and addressing any underlying issues such as faulty stringers or water damage. The complexity of the task will depend on the style of the boat and the extent of the damage, but with the right tools and knowledge, it is possible to restore the boat's flooring to its former glory.
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What You'll Learn

Removing the old floor
Next, you will need to determine the extent of the damage and decide whether you will need to replace the stringers and bulkheads. If they are rotten, they will need to be replaced with fiberglass ones. You can cut a small hole with a hole saw near a corner to inspect the condition of the stringers and bulkheads. If they are wood, there is a good chance they will be damaged from water penetration.
Once you have determined the extent of the damage, you can start cutting out the old floor with an electric saw or a skill saw. If you are replacing the stringers, you will need to take measurements at this point. Each side may vary slightly, so it is important to take separate measurements for each stringer.
Finally, you will need to remove the seats and any remaining connections. This process can take a significant amount of time, and it is important to be prepared for unexpected challenges.
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Measuring the new floor
First, determine the extent of the damage and identify the areas that need replacement. This includes assessing the condition of the plywood underneath any carpeting or flooring. If there is significant rot or damage, you may need to cut out the affected areas with a skill saw or a thin-blade saw, ensuring you reach the source of the problem.
Next, take measurements of the area to be replaced. Use a tape measure to determine the length and width of the space where the new floor will go. It is important to measure twice and cut once to ensure accuracy and avoid mistakes. Measure the size of your deck to understand how much new flooring you will need. Don't forget to consider the thickness of the new flooring material as well.
If you are replacing the stringers, take separate measurements for each one, as each side may vary slightly. Measure the length and width of each stringer and make note of any unique characteristics or curves. Additionally, consider the height of the stringers to ensure they fit properly within the boat.
Before cutting the new flooring material, create a template. You can use the old flooring pieces as a guide if they are in relatively good condition. Mark the locations of any cables or connections on the template, ensuring they align with the square holes in the new flooring. This will ensure that you can properly secure the new flooring without interfering with the boat's functionality.
Finally, when you are confident in your measurements, cut the new flooring material accordingly. Always wear appropriate safety gear when cutting, and use a sharp blade to ensure clean edges. It is advisable to cut the deck flooring into separate sheets to make the installation process more manageable.
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Cutting the new floor
Before cutting the new floor, it is important to inspect the stringers and bulkheads for any damage or rot. If they are damaged, they will need to be replaced with fiberglass ones. The stringers provide support for the new floor, so ensuring they are in good condition is crucial.
When cutting the plywood, use a thin-blade saw, such as a Fein Multimaster or a Dremel, to get a precise cut. Cut the plywood sheets to fit the size of the deck, and create square holes in the sheets for all the fittings on the deck. If you are replacing the stringers, cut them from a plywood sheet using an electric saw.
It is also recommended to cut the new floor at a 45-degree angle instead of a 90-degree angle. This creates a lip that the new floor can sit on, making the repair more solid and easier. Additionally, consider cutting out the floor and fiberglassing it beforehand, especially if you are short on time. This will allow you to work on the edges on a nice day and avoid having the floor cut out for an extended period.
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Installing the new floor
Before installing a new floor, you must first remove the old one. This involves clearing out the boat, removing any debris, and taking out anything that is old and damaged, such as plywood underneath the carpeting. You should also remove the centre console and any cables at this point.
Once the old floor has been removed, you can start to install the new one. The most common material used for boat flooring is BC plywood, which is also used for fiberglass boats in particular. If your boat previously had carpet, you may prefer to replace it with new carpet as this will cover any imperfections.
If you are also replacing the stringers, take good measurements. Each side can vary slightly, so it is better to take separate measurements for each stringer. Then, use an electric saw to cut the stringers from the plywood sheet and fit them into the boat. Screw them all together to create a solid frame and apply fibreglass matting for waterproofing.
It is recommended that you cut the deck flooring into separate sheets to make it easier to install. Measure the size of the deck and determine how many sheets you will need. Then, cut square holes in the sheets for all the fittings on the deck in the appropriate areas. When you are done making your cuts, start placing the deck sheets. Each time you lay a sheet, pass the cables and other connections through the square holes before placing the next one. Once the deck sheets are in place, secure them together with screws before applying the fibreglass matting.
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Finishing touches
Once you've completed the installation of your new deck sheets, there are a few more steps to take before you can enjoy your refurbished boat. Firstly, it's important to secure the sheets together with screws, creating a solid base for your flooring. This will also help to protect the underlying structure of your boat and ensure the longevity of your repairs. After that, apply a layer of fiberglass matting for waterproofing. This step is crucial, as it will protect your boat from water damage and help to prevent rot in the future.
Before replacing the seats and centre console, it's a good idea to clean the area thoroughly. This will ensure that any debris or dirt left over from the repair process doesn't cause any issues with the functionality of your boat. Once the area is clean, you can start the engine in a secure location to test the connections and ensure that everything is functioning correctly.
When reattaching the seats and centre console, take your time to ensure that all connections are secure and properly in place. Pay close attention to the cables and connections, as improper installation can lead to safety hazards. It's also important to note that, while you have access to the underlying structure of the boat, it's a good opportunity to address any other issues, such as faulty boat stringers or water damage.
Finally, consider using a sealant to ensure a water-tight seal around your new flooring. This will help to protect your boat from water damage and ensure that your repairs last for years to come. It is recommended to use products specifically designed for marine use, as they are formulated to withstand the unique challenges of a boating environment, such as exposure to water and salt.
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Frequently asked questions
First, remove everything from the interior of the boat. Then, cut out the damaged floor with an electric saw. If the stringers are rotten, replace them with fiberglass ones. Unscrew the center console box and the seat and disconnect the cables. Cut the deck flooring into separate sheets and make sure to note the position of any cables or connections. Place the deck sheets, passing the cables through the square holes, and secure them with screws. Apply fiberglass matting for waterproofing.
You will need an electric saw, a screwdriver, and a tape measure.
You will need new flooring, such as BC plywood, and fiberglass matting for waterproofing.
It depends on the extent of the damage, but it is usually a larger job than you think. It could take several months to complete the repair.
Yes, you can fiberglass the plywood outside of the boat before installing it.










































