Attaching Boat Seats: Securing To An Aluminum Boat Floor

Installing seats on an aluminium boat can be a tricky endeavour. The softness of aluminium means that it is easy to tear out tapped threads, so it is important to be careful when screwing into the material. One method is to bolt wood down across the length of the bench and then attach the seats to that, using normal lumber treated with a sealant. Another option is to use a rivet nut, which can be installed without access to the backside of the install site.

Using stainless steel bolts and nuts

When installing seats on an aluminium boat, it is recommended to use stainless steel bolts and nuts. This type of fastener is ideal for marine applications as it offers strong holding power and corrosion resistance, especially when coupled with a suitable thread-locking adhesive.

To begin the installation process, you will need to assess the load that the fasteners will need to bear. Pedestal seat bases, for example, exert significant prying forces on their forward and aft fasteners as your body weight shifts. Therefore, it is crucial to select an appropriate fastener that can withstand these tensile and shear forces.

When using stainless steel bolts and nuts, follow these steps:

• Reinforce the mounting surface: Use stainless steel reinforcing plates, both on top and beneath the mounting surface, to distribute the load and provide additional support. If stainless steel plates are unavailable, you can alternatively use a good hardwood as a reinforcing material.
• Choose the appropriate bolt size: Select a bolt that is compatible with the thickness of the material you are drilling into. For thicker aluminium plates, you may need longer bolts to ensure a secure grip.
• Drill pilot holes: Create pilot holes in the aluminium boat's floor and the reinforcing plates (if used). Ensure the holes are slightly larger than the bolt size to prevent binding.
• Apply lubricants or sealants: Use wax, paraffin, soap, or a marine sealant on the bolt threads to make installation easier and create a watertight seal.
• Assemble the bolts and nuts: Insert the bolts through the reinforcing plate and the mounting hole in the boat's floor. Secure them with stainless steel nuts on the opposite side. Use nylock nuts, which have a nylon collar, to prevent the nuts from loosening due to vibration.
• Tighten gently: Avoid overtightening the bolts, as this can strip the threads or break the fastener. Instead, snug the bolts gently and consider using a torque wrench to apply the appropriate amount of torque for the bolt size.

By following these steps and using stainless steel bolts and nuts, you can securely attach seats to the floor of your aluminium boat, ensuring a safe and sturdy installation.

Reinforcing with stainless plates or hardwood

Preparing the Reinforcement:

• Stainless Steel Plates: Opt for stainless steel reinforcing plates that can be placed both on top of and beneath the mounting surface. Ensure you get plates that are large enough to provide ample support and distribute the weight load effectively.
• Hardwood: If you can't get stainless steel plates, choose a good hardwood as an alternative. Select a hardwood species known for its strength and durability, such as oak or maple. Cut the hardwood to match the size and shape of your boat's bench or mounting surface.

Mounting the Reinforcement:

• Stainless Steel Plates: Use stainless steel bolts and nuts to secure the reinforcing plates in place. If possible, go all the way through the mounting surface with your bolts for added strength. Ensure the bolts are also made of stainless steel for durability and corrosion resistance.
• Hardwood: To attach the hardwood reinforcement, it is recommended to bolt the wood down across the length of the bench. This will provide a sturdy base for your boat seat and reduce the chance of the bolts ripping out of the aluminum. Use untreated lumber to avoid any chemical reactions with the aluminum, and treat the wood with a suitable sealant or coating.

Reinforcing your boat seat installation with stainless steel plates or hardwood will help distribute the weight load, reduce flex, and provide a more secure mounting for your boat seats. Remember to use stainless steel fasteners and always follow best practices for boat maintenance and safety.

Using toggle bolts

Step 1: Gather Your Materials

Before you begin, make sure you have all the necessary materials. You will need toggle bolts, a drill, a drill bit, and a wrench or screwdriver. The toggle bolts should be made of stainless steel to prevent rusting and reacting with the aluminium. It is also recommended to use bolts that are long enough to go through the aluminium floor and provide a secure hold.

Step 2: Prepare the Surface

Clean the area where you will be attaching the seat. The surface should be free of any dirt, grease, or debris. If necessary, you can use a degreaser or cleaner to ensure the area is ready for drilling.

Step 3: Mark the Drill Holes

Determine the location for your seat and mark the drill holes accordingly. Make sure you have accurately measured and marked the locations for the bolts. It is essential to ensure that the seat will be securely attached and aligned correctly.

Step 4: Drill the Holes

Using the drill and the appropriate drill bit, carefully drill holes at the marked locations. The drill bit size should match the size of the toggle bolts you are using. Drill slowly and with caution to avoid damaging the aluminium floor. Take your time and ensure the holes are drilled straight and at the correct depth.

Step 5: Insert the Toggle Bolts

Now, you can insert the toggle bolts. Toggle bolts have a unique design with a spring-loaded wing that folds closed and opens once inside the drilled hole. Insert the bolts into the holes and tighten them using a wrench or screwdriver. Make sure the bolts are securely fastened and do not overtighten them, as this can strip the aluminium.

Step 6: Attach the Seat

Finally, you can attach the seat to the toggle bolts. Make sure the seat is properly aligned and secured to the bolts. Follow the manufacturer's instructions for attaching the seat, as different seats may have specific requirements.

By following these steps, you can securely attach a seat to the floor of your aluminium boat using toggle bolts. Remember to take your time, work carefully, and ensure all fasteners are tight and secure. With this method, you can enjoy a sturdy and safe seat in your boat without having to access the underside of the floor.

Drilling holes in the seat

Prepare the Necessary Tools and Materials:

Before you begin, gather the required tools and materials. You'll need a drill, drill bits, a ruler or measuring tape, and a pencil for marking. It is also recommended to have a vise or clamp to hold the seat securely while drilling. Additionally, you'll need stainless steel screws, washers, and silicone sealant.

Measure and Mark the Drill Points:

Carefully measure and mark the locations where you plan to drill the holes on the seat. Ensure that the holes are evenly spaced and aligned correctly. Use a ruler or measuring tape to achieve accurate measurements. Mark the spots with a pencil to create a clear guide for drilling.

Drill the Holes:

Secure the seat in a vise or with clamps to stabilize it during drilling. Select the appropriate drill bit size that matches your screws. Start drilling at low speed and gradually increase as needed. Apply gentle and steady pressure to create clean and precise holes. Take your time and avoid rushing this step to prevent any mistakes.

Prepare the Surface:

Once the holes are drilled, clean the area around them to remove any debris or shavings. Use a soft brush or cloth to wipe away any residue. It is essential to have a clean surface before proceeding to the next step.

Attach the Seat to the Floor:

Now, you can attach the seat to the floor of your aluminum boat. Insert the stainless steel screws through the holes and secure them tightly. Use washers to distribute the pressure and provide a stronger hold. Apply a small amount of silicone sealant around each screw head to create a watertight seal. This will help prevent water intrusion and potential corrosion.

By following these steps and taking your time, you can effectively drill holes in the seat for a secure attachment to the floor of your aluminum boat. Remember to work carefully and use the appropriate tools and materials to ensure a safe and long-lasting installation.

Using clamps to attach the seat to the bench

Clamps can be an effective way to attach a seat to a bench in an aluminium boat. Here is a step-by-step guide:

First, decide on the type of clamps you want to use. Turnbuttons, cleats, and tusk tenons are all options suggested by woodworkers for securing benches. For aluminium boats, you may want to consider the type of clamps used by companies like Excel, which manufactures boats. These clamps are often made of black plastic and are screwed onto the seat board. You can also use tarpaulin clips to prevent the seats from moving.

Next, gather the necessary tools and materials. This includes the clamps you have chosen, as well as any screws, bolts, or other fasteners that are needed to secure the clamps in place. If you are drilling holes for screws or bolts, make sure they are stainless steel to prevent corrosion. You may also want to use washers, backing plates, or reinforcing plates to distribute the weight and protect the aluminium.

Before you begin, make sure you have measured and marked the correct placement for the clamps and fasteners. This will ensure that the seat is securely attached and aligned properly.

Now you are ready to attach the clamps to the bench. Follow the instructions for your chosen type of clamp. For example, if using turnbuttons, you will need to create small mortises or a groove along the inside of the bench rails for the turnbuttons to engage with. If using cleats or tusk tenons, you will need to create appropriate mortises or apertures for these to fit into. If your clamps are screwed in place, make sure the screws are tight and secure.

Finally, test the stability of the seat by applying pressure to it. Make sure the clamps are securely attached and that the seat does not wobble. If you are satisfied with the stability, your seat is now ready to use!

Remember, it is important to take your time and plan carefully when attaching a seat to a bench in an aluminium boat. This will ensure a safe and secure installation.

Frequently asked questions