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How to Align & Fit a Bulkhead in a Bare Hull

A bare hull is a boat frame for do-it-yourself boat building enthusiasts. Bulkheads are interior walls that shore up the shape and strength of the hull. Because measurements for bulkhead fittings can change as the hull shifts, fitting and aligning bulkheads during installation is a tricky task. You may add as many bulkheads as you desire, though three is a minimum. For those who love a challenge, consider extending your bulkhead into the bilge.

Things You'll Need

  • Measuring tape
  • Saw
  • 2-by-10 lumber board
  • 2-by-4 lumber board
  • Screws
  • Drill
  • Plywood
  • Pencil
  • Clamps
  • 1-inch foam strip
  • Hot glue
  • Hot glue gun
  • Epoxy tape
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Instructions

    • 1

      Measure the bare hull down the center line from stern to bow. Determine the midpoint and measure the width of the hull at the midpoint.

    • 2

      Cut a 2-by-10 lumber board to fit the measure of the hull's width at the midpoint. Cut two small pieces of 2-by-4. Screw a piece of 2-by-4 to each end of the 2-by-10 board. Screw these ends to the edge of the hull so that the 2-by-10 stretches across the midpoint of the hull. This beam will stabilize the hull while you fit the bulkhead.

    • 3

      Screw a piece of plywood to form a 90 degree angle to the center of the stabilizing beam. The plywood should meet the hull floor. Use another long, narrow strip of plywood as a measuring tool against the 90 degree beam to the angle down the port and starboard side of the hull. Mark in pencil the angle of the narrow beam against the 90 degree beam for use in measuring.

    • 4

      Unscrew the 90 degree plywood from the stabilizing beam. Place a large sheet of plywood on a flat surface. Recreate the shape of the hull by transferring the marks onto the large sheet of plywood. Draw a connecting line between each of the marks made. Cut along this line with a saw. You now have a bulkhead.

    • 5

      Validate the fit of the bulkhead. Set the bulkhead into place inside the hull. Align the bulkhead against the stabilizing beam. Clamp the bulkhead into place. Note the need for any adjustments. Unclamp the bulkhead and remove.

    • 6

      Make any adjustments needed to your bulkhead. Saw 1 inch off the curve of the bulkhead.

    • 7

      Hot glue a 1-inch foam strip down the midpoint line of the hull on both the starboard and port side of the hull. This foam will cushion the bulkhead against the side of the hull. Affix the bulkhead with epoxy tape.


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